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Systematic study of laser-assisted cluster radioactivity for deformed nuclei 认领 引用
1
作者 Leng-Jun Liao Lin-Jing Qi +2 位作者 Xi-Jun Wu Xiao-Hua Li Ming Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第4期232-242,共11页
In this study,the effects of laser fields that can be achieved in the near future on cluster penetration probability and half-life are quantitatively investigated.The calculation results show that extreme laser fields... In this study,the effects of laser fields that can be achieved in the near future on cluster penetration probability and half-life are quantitatively investigated.The calculation results show that extreme laser fields can slightly change the cluster-decay half-life by affecting the penetration probability within a narrow range.Subsequently,we discuss the correlation between the change rate of the penetration probability and the tunneling path.The results indicate that for different parent nuclei emitting the same cluster,nuclei with longer tunneling paths are more easily affected by the laser fields.The shell effect on this correlation is also observed.In addition,the impact of laser fields on the penetration probability in any direction is investigated. 展开更多
关键词 Cluster radioactivity Half-life Extreme laser field Penetration probability
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Rewriting the Rules of Cancer Therapy Using Radioactivity-Driven Chemistry 认领 引用
2
《Bulletin of the Chinese Academy of Sciences》 2026年第2期101-103,共3页
The Tan Kah Kee Young Scientist Award in Chemistry goes to Prof.LIU Zhibo from Peking University,recognizing his pioneering contributions to radioactivity-driven chemistry.Operating at the intersection of life science... The Tan Kah Kee Young Scientist Award in Chemistry goes to Prof.LIU Zhibo from Peking University,recognizing his pioneering contributions to radioactivity-driven chemistry.Operating at the intersection of life sciences and urgent clinical needs,his innovative covalent radiopharmaceutical technology shatters the historical bottleneck of traditional radiopharmaceuticals:the persistent trade-off between therapeutic efficacy and safety.Furthermore,LIU has leveraged the unique properties of radioactivity to uncover the anti-tumor immune activity of pyroptosis. 展开更多
关键词 cancer therapy tan kah kee young scientist award radioactivity driven chemistry therapeutic efficacy pyroptosis safety life sciences covalent radiopharmaceutical technology
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αdecay and cluster radioactivity in extreme laser fields 认领 引用 被引量：1
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作者 Hui Wang Ying-Ge Huang +4 位作者 Ze-Peng Gao Jia-Li Huang Er-Xi Xiao Long Zhu Jun Su 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第9期150-160,共11页
The potential of high-intensity lasers to influence nuclear decay processes has attracted considerable interest.This study quantitatively evaluated the effects of high-intensity lasers on α decay and cluster radioact... The potential of high-intensity lasers to influence nuclear decay processes has attracted considerable interest.This study quantitatively evaluated the effects of high-intensity lasers on α decay and cluster radioactivity.Our calculations revealed that,among the parent nuclei investigated,144Nd is the most susceptible to laser-induced alterations,primarily because of its relatively low decay energy.Additionally,circularly polarized lasers exhibit a greater impact on decay modifications than linearly polarized lasers.Given the limited time resolution of current detectors,it is essential to account for the timeaveraging effect of the laser.By incorporating the effects of circular polarization,time averaging,and angular averaging,our theoretical predictions indicated that the modification of144Nd decay could reach 0.1%at an intensity of 1027W/cm2.However,this intensity significantly exceeds the current laser capability of 1023W/cm2,and the predicted modification of 0.1%remains below the detection threshold of contemporary measurement techniques.Observing laser-assistedαdecay and14C cluster radioactivity will likely remain unfeasible until both ultrahigh laser intensities and significant advancements in experimental resolution are achieved. 展开更多
关键词 Extreme laser field Frozen Hartree–Fock method 훼decay Cluster radioactivity
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Origin and risk assessment of natural radioactivity in groundwater from the Eastern Gonghe Basin,Tibetan Plateau 认领 引用
4
作者 Zhao-xuan Niu Zhi-hui Deng +5 位作者 Xue Niu Dong-fang Chen Gui-lin Zhu Wen-hao Xu Lin-you Zhang Qing-da Feng 《Journal of Groundwater Science and Engineering》 2025年第3期301-311,共11页
This study systematically investigates natural radioactivity in groundwater from the densely populated eastern Gonghe Basin in Qinghai Province,aiming to reveal its spatial distribution,origins,and potential health ri... This study systematically investigates natural radioactivity in groundwater from the densely populated eastern Gonghe Basin in Qinghai Province,aiming to reveal its spatial distribution,origins,and potential health risks.The characteristics of gross-αand gross-βactivities,as well as the concentrations of nuclide including238U,232Th,and226Ra,have been investigated in groundwater samples from 12 groups encompassing various types such as hot springs and artesian wells across different aquifer systems.Correlation analysis and dose estimation models were applied to preliminary estimate the radiation exposure to local residents and to explore the genesis and hazards of natural radioactivity in groundwater.Results indicate that overall groundwater radioactivity in the Gonghe Basin remains within acceptable limits,with mean gross-αand gross-βactivity concentrations of 0.32 Bq/L and 0.27 Bq/L,respectively.Approximately 83.33%of samples comply with relevant national standards.However,two fault-controlled high-temperature spring samples exhibited gross-αactivity exceeding regulatory limits,with one also showing elevated gross-βactivity surpassing China's Class III groundwater quality standards for radioactivity.Furthermore,single-radionuclideαradioactivity from230Th,226Ra,210Po,and232Th exceeded regulatory thresholds in some samples,suggesting potential long-term health risks.While most samples complied with effective dose limits,four showed210Poαradioactivity exceedances within controllable risk ranges.The findings suggest that groundwater radioactivity in the region is primarily controlled by geological structures,lithology,and hydrothermal conditions,with fault zones and high-temperature environments serving as key factors in radionuclide enrichment.This research provides scientific foundation for the sustainable development of geothermal resources and the prevention of radioactive water contamination.Continuous monitoring of high-radioactivity hot springs and prudent resource utilization are recommended. 展开更多
关键词 Groundwater radioactivity Gross-α Gross-β Radionuclides Effective dose
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Recent progress in two-proton radioactivity 认领 引用 被引量：24
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作者 Long Zhou Si-Min Wang +1 位作者 De-Qing Fang Yu-Gang Ma 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第8期118-146,共29页
During the last few decades,rare isotope beam facilities have provided unique data for studying the properties of nuclides located far from the beta-stability line.Such nuclei are often accompanied by exotic structure... During the last few decades,rare isotope beam facilities have provided unique data for studying the properties of nuclides located far from the beta-stability line.Such nuclei are often accompanied by exotic structures and radioactive modes,which represent the forefront of nuclear research.Among them,two-proton(2p)radioactivity is a rare decay mode found in a few highly proton-rich isotopes.The 2p decay lifetimes and properties of emitted protons hold invaluable information regarding the nuclear structures in the presence of a low-lying proton continuum;as such,they have attracted considerable research attention.In this review,we present some of the recent experimental and theoretical progress regarding the 2p decay,including technical innovations for measuring nucleon-nucleon correlations and developments in the models that connect their structural aspects with their decay properties.This impressive progress should play a significant role in elucidating the mechanism of these exotic decays,probing the corresponding components inside nuclei,and providing deep insights into the open quantum nature of dripline systems. 展开更多
关键词 Exotic decay Two-proton radioactivity Nucleon-nucleon correlation Experimental and theoretical development
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Two-proton radioactivity of the excited state within the Gamow-like and modified Gamow-like models 认领 引用 被引量：7
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作者 De-Xing Zhu Yang-Yang Xu +3 位作者 Hong-Ming Liu Xi-Jun Wu Biao He Xiao-Hua Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第10期1-10,共10页
In this study,we systematically investigated the two-proton(2p)radioactivity half-lives from the excited state of nuclei near the proton drip line within the Gamowlike model(GLM)and modified Gamow-like model(MGLM).The... In this study,we systematically investigated the two-proton(2p)radioactivity half-lives from the excited state of nuclei near the proton drip line within the Gamowlike model(GLM)and modified Gamow-like model(MGLM).The calculated results were highly consistent with the theoretical values obtained using the unified fission model[Chin.Phys.C 45,124105(2021)],effective liquid drop model,and generalized liquid drop model[Acta Phys.Sin 71,062301(2022)].Furthermore,utilizing the GLM and MGLM,we predicted the 2p radioactivity halflives from the excited state for some nuclei that are not yet available experimentally.Simultaneously,by analyzing the calculated results from these theoretical models,it was found that the half-lives are strongly dependent on Qand l. 展开更多
关键词 2p radioactivity Gamow-like model Halflife Excited state
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Systematic study of proton radioactivity half‑lives 认领 引用 被引量：4
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作者 Yang‑Yang Xu Xiao‑Yuan Hu +3 位作者 De‑Xing Zhu Xi‑Jun Wu Peng‑Cheng Chu Xiao‑Hua Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第2期167-177,共11页
In the present study,on the basis of the screened electrostatic effect of the Coulomb potential,we propose an improved Gamow model within the centrifugal potential in which there are only two adjustable parameters,i.e... In the present study,on the basis of the screened electrostatic effect of the Coulomb potential,we propose an improved Gamow model within the centrifugal potential in which there are only two adjustable parameters,i.e.,the screened parameters t and g,which represent the combined effect of the interaction potential and reduced mass of the emitted proton-daughter nucleus on the half-life of proton radioactivity in the overlapping region.Using this model,we systematically calculated the proton radioactivity half-lives of 31 spherical nuclei and 13 deformed nuclei and obtained corresponding root-mean-square deviations of 0.274 and 0.367,respectively.The relationship between the proton radioactivity half-life of 177Tlm and the corresponding angular momentum l removed by the emitted proton is also discussed.In addition,we used the proposed model to predict the proton radioactivity half-lives of 18 nuclei whose proton radioactivity is energetically allowed or observed but not yet quantified in NUBASE2020.For comparison,we used the universal decay law of proton radioactivity proposed by Qi et al.(Phys Rev C 85:011303,2012.http://gffzzd3cc09b8251d45dfs0qw506kbbkc56o6x.ffgz.tsg.suse.edu.cn/10.1103/PhysR evC.85.011303),and the new Geiger–Nuttall law of proton radioactivity proposed by Chen et al.(Eur Phys J 55:214,2019.http://gffzzd3cc09b8251d45dfs0qw506kbbkc56o6x.ffgz.tsg.suse.edu.cn/10.1140/epja/i2019-12927-7). 展开更多
关键词 Proton radioactivity Gamow model Half-lives
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Two-proton radioactivity from excited states of proton-rich nuclei within Coulomb and Proximity Potential Model 认领 引用 被引量：3
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作者 De-Xing Zhu Yang-Yang Xu +3 位作者 Li-Jia Chu Xi-Jun Wu Biao He Xiao-Hua Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第9期1-7,共7页
In the present work,we extend the Coulomb and Proximity Potential Model(CPPM)to study two-proton(2p)radioactivity from excited states while the proximity potential is chosen as AW95 proposed by Aage Withner in 1995.De... In the present work,we extend the Coulomb and Proximity Potential Model(CPPM)to study two-proton(2p)radioactivity from excited states while the proximity potential is chosen as AW95 proposed by Aage Withner in 1995.Demonstration reveals that the theoretical results acquired by CPPM exhibit a high level of consistency with prior theoretical models such as the unified fission model(UFM),generalized liquid-drop model(GLDM)and effective liquid-drop model(ELDM).Furthermore,within the CPPM,we predicted the half-lives of potential 2p radioactive nuclei for which experimental data are currently unavailable.The predicted results were then assessed,compared with UFM,ELDM and GLDM models,and examined in detail. 展开更多
关键词 2p radioactivity CPPM Half-lives Excited state
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Two-proton radioactivity of exotic nuclei beyond proton drip-line 认领 引用 被引量：2
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作者 Yanzhao Wang Jianpo Cui +1 位作者 Yonghao Gao Jianzhong Gu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2021年第7期81-88,共8页
To search for new candidates of the true and simultaneous two-proton(2 p)radioactivity,the 2 p decay energies(Q2 p)are extracted by the Weizs?cker–Skyrme-4(WS4)model,the finite-range droplet model(FRDM),the Koura–Ta... To search for new candidates of the true and simultaneous two-proton(2 p)radioactivity,the 2 p decay energies(Q2 p)are extracted by the Weizs?cker–Skyrme-4(WS4)model,the finite-range droplet model(FRDM),the Koura–Tachibana–Uno–Yamada(KTUY)model and the Hartree–Fock–Bogoliubov mean-field model with the BSk29 Skyrme interaction(HFB29).Then,the 2 p radioactivity half-lives are calculated within the generalized liquid drop model by inputting the four types of Q2 pvalues.By the energy and half-life constraints,it is found that the probable 2 p decay candidates are the nuclei beyond the proton-drip line in the region of Z≤50 based on the WS4 and KTUY mass models.For the FRDM mass model,the probable 2 p decay candidates are found in the region of Z≤44.However,the 2p-decaying candidates are predicted in the region of Z≤58 by the HFB29 mass model.It means that the probable 2 p decay candidates of Z>50 are only predicted by the HFB29 mass model.Finally,the competition between the true 2p radioactivity andα-decay for the nuclei above the N=Z=50 shell closures is discussed.It is shown that~(101)Te,~(111)Ba and~(114)Ce prefer to 2p radioactivity and the dominant decay mode of~(107)Xe and~(116)Ce isα-decay. 展开更多
关键词 2p radioactivity alpha-decay decay energies half-lives GLDM
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Favored one proton radioactivity within a one-parameter model 认领 引用 被引量：2
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作者 You-Tian Zou Xiao Pan +2 位作者 Xiao-Hua Li Xi-Jun Wu Biao He 《Communications in Theoretical Physics》 SCIE CAS CSCD 2022年第11期151-158,共8页
In the present work,a phenomenological one-parameter model(OPM)based on the WentzelKramers-Brillouin(WKB)theory is applied to study the favored one proton radioactivity(the orbital angular momentum l taken away by the... In the present work,a phenomenological one-parameter model(OPM)based on the WentzelKramers-Brillouin(WKB)theory is applied to study the favored one proton radioactivity(the orbital angular momentum l taken away by the emitted proton is equal to zero)half-lives.The calculated results can reproduce the experimental data well within a factor of~3.In addition,we extend the OPM to predict the half-lives of possible favored one proton radioactivity nuclei whose decay is energetically allowed or observed but not quantified in NUBASE2020.For comparison,a universal decay law of one proton radioactivity(UDLP)is also used.It is obviously found that our predicted results are close to the ones using UDLP.The predictions are helpful for searching for the new nuclides with favored one proton radioactivity. 展开更多
关键词 favored one proton radioactivity one-parameter model half-lives
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Low-radioactivity ultrasonic hydrophone used in positioning system for Jiangmen Underground Neutrino Observatory 认领 引用 被引量：1
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作者 Duo Teng Jiang-Lai Liu +6 位作者 Guo-Lei Zhu Yue Meng Yuan-yuan Zhang Tao Zhang Kai Luo Rui Li Jia-Qi Hui 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第6期102-113,共12页
To satisfy the accurate positioning requirement of the calibration source in the Jiangmen Underground Neutrino Observatory, a Tonpilz-type hydrophone with low radioactivity and high electroacoustics is developed.The r... To satisfy the accurate positioning requirement of the calibration source in the Jiangmen Underground Neutrino Observatory, a Tonpilz-type hydrophone with low radioactivity and high electroacoustics is developed.The radioactivity of the proposed hydrophone is strictly controlled by selecting pure raw materials, especially active piezoelectric ceramics. The electroacoustic performance of the hydrophone is improved by making structural optimization. High sensitivity and aimed directivity are achieved using 33-mode piezoelectric ceramic rings arranged in series and improvement in the radiating head of the Tonpilz hydrophone, respectively. All electroacoustic performances are studied through finite element analyses.The simulations indicate that the electroacoustic performances of the hydrophones in linear alkylbenzene-based liquid scintillator can be approximately predicted according to the results in water because their differences caused by two types of acoustic media, water and liquid scintillator, are known. The tests show that the hydrophone prototype can achieve a maximum sensitivity of-209.3dB and a beamwidth of 132.2° at a frequency of 143 kHz.In addition, eight hydrophones only contributed to a background radioactivity level of 26 ± 4 mHz in the neutrino analysis. 展开更多
关键词 JUNO Liquid scintillator Tonpilz hydrophone Low radioactivity Sensitivity Directivity Finite element
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Released energy formula for proton radioactivity based on the liquid-drop model 认领 引用 被引量：1
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作者 Xiao Pan You-Tian Zou +3 位作者 Hong-Ming Liu Biao He Xiao-Hua Li Dong Xiang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2021年第7期89-94,共6页
In this work,based on the liquid-drop model and considering the shell correction,we propose a simple formula to calculate the released energy of proton radioactivity(Qp).The parameters of this formula are obtained ... In this work,based on the liquid-drop model and considering the shell correction,we propose a simple formula to calculate the released energy of proton radioactivity(Qp).The parameters of this formula are obtained by fitting the experimental data of 29 nuclei with proton radioactivity from ground state.The standard deviation between the theoretical values and experimental ones is only 0.157 Me V.In addition,we extend this formula to calculate 51 proton radioactivity candidates in region 51≤Z≤83 taken from the latest evaluated atomic mass table AME2016 and compared with the Qpcalculated by WS4 and HFB-29.The calculated results indicate that the evaluation ability of this formula for Qpis inferior to WS4 while better than HFB-29. 展开更多
关键词 the released energy of proton radioactivity liquid-drop model shell correction
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Systematic study on heavy-particle radioactivity of superheavy nuclei 297–300119 认领 引用
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作者 Megha Chandran V.K.Anjali K.P.Santhosh 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第11期108-123,共16页
In the current study,we examined every possible cluster-daughter combination in the heavy-particle decay of isotopes 297-300119 and computed the decay half-lives using the modified generalized liquid drop model(MGL... In the current study,we examined every possible cluster-daughter combination in the heavy-particle decay of isotopes 297-300119 and computed the decay half-lives using the modified generalized liquid drop model(MGLDM)with the preformation factor depending on the disintegration energy.The predicted half-life of every heavy cluster(ZC≥32)was within the experimentally observable limits.These results aligned with the predictions of Poenaru et al.[Phys.Rev.Lett.107,062503(2011)]that superheavy nuclei(SHN)with Z>110 will release heavy particles with a penetrability comparable to or greater than theα-decay.The half-lives predicted using the MGLDM for clusters89Rb,91Rb,and92Rb from parents297119,299119,and300119,respectively,agreed with the predictions of Poenaru et al.[Eur.Phys.J.A 54,14(2018)].It was found that the isotopes of heavy clusters Kr,Rb,Sr,Pa,In,and Cd had half-lives comparable to theαhalf-life;and isotopes of clusters I,Xe,and Cs had the minimum half-life(10-14s).These observations revealed the role of the shell closure(Z=82,N=82,and N=126)of the cluster and daughter nuclei in heavy-cluster radioactivity.We predicted that isotope 297,299119 decayed by 4αdecay chains and isotope300119 decayed by 6αdecay chains,while298119 decayed by continuousαdecay chains.The predicted half-lives and modes of decay of the nuclei in the decay chains of297-300119 agreed with the experimental data,proving the reliability of our calculations.The present study determined the most favorable heavy-cluster emissions from these nuclei and provided suitable projectile-target combinations for their synthesis. 展开更多
关键词 Cluster radioactivity Alpha radioactivity Superheavy nuclei
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A study of natural radioactivity levels of soil in the Lincang Basin,Yunna 认领 引用 被引量：1
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作者 LI Baozhu YAN Yongfeng 《Chinese Journal Of Geochemistry》 2012年第2期191-194,共4页
Influenced by the Indosinian Lincang granite,the level the natural radioactivity in the Lincang Basin is relatively high.This work deals with the determination of natural radioactivity of soil in this area by using th... Influenced by the Indosinian Lincang granite,the level the natural radioactivity in the Lincang Basin is relatively high.This work deals with the determination of natural radioactivity of soil in this area by using theγ-ray spectrometer.The specific activities of 226Ra,238U,232Th and 40K obtained were obviously greater than the average values of these nuclides countrywide and worldwide,which were 53.4(from 38.7 to 62.8),161.2(from 127.3 to 211.7),120.9(from 106.5 to 140.6)and 632.2(from 521.7 to 707.5)Bq/kg.Based on the research data,the level of natural radioactivity of the granite was high,which impacts and provides a good source of soil radioactivity in the study area.To assess the radiological hazard of the natural radioactivity in soil,theγ-absorbed dose rate and annual effective dose rate were calculated.The results show that,although theγ-absorbed dose rate in the study area is a little high,the annual effective dose rate is lower than the recommended value.So the Lincang Basin is safe with respect to radiological level and its living environment is not affected. 展开更多
关键词 Lincang Basin natural radioactivity absorbed dose annual effective dose
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Proton Radioactivity Within a Hybrid Method 认领 引用 被引量：1
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作者 张鸿飞 《原子核物理评论》 CAS CSCD 北大核心 2016年第2期167-172,共6页
The proton radioactivity half-lives are investigated theoretically within a hybrid method.The potential barriers preventing the emission of protons are determined in the quasimolecular shape path within a generalized ... The proton radioactivity half-lives are investigated theoretically within a hybrid method.The potential barriers preventing the emission of protons are determined in the quasimolecular shape path within a generalized liquid drop model(GLDM). The penetrability is calculated with the WentzelKramers-Brillouin(WKB) approximation. The spectroscopic factor has been taken into account in halflife calculation, which is obtained by employing the relativistic mean field(RMF) theory combined with the Bardeen-Cooper-Schrieffer(BCS) method. The half-lives within the present hybrid method reproduced the experimental data very well. Some predictions for proton radioactivity are made for future experiments. 展开更多
关键词 proton radioactivity generalized liquid drop model WKB approximation BCS method relativistic mean field theory
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Calculations of radioactivity and afterheat in the components of the CSNS target station 认领 引用
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作者 于全芝 梁天骄 +3 位作者 殷雯 严启伟 贾学军 王芳卫 《Chinese Physics B》 SCIE EI CAS 2009年第9期3815-3818,共4页
This paper shows the calculations of radioactivity and afterheat in the components of the China Spallation Neutron Source （CSNS） target station, with the Monte Carlo codes LAHET, MCNP4C and the multigroup code CINDE... This paper shows the calculations of radioactivity and afterheat in the components of the China Spallation Neutron Source （CSNS） target station, with the Monte Carlo codes LAHET, MCNP4C and the multigroup code CINDER＇90. These calculations provide essential data for the detailed design and maintenance of the CSNS target station. 展开更多
关键词 Monte Carlo codes radioactivity afterheat CSNS target station
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An improved effective liquid drop model for cluster radioactivity 认领 引用
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作者 崔建坡 邢凤竹 +3 位作者 高永浩 齐立倩 王艳召 顾建中 《Communications in Theoretical Physics》 SCIE CAS CSCD 2024年第3期127-137,共11页
The effective liquid drop model(ELDM)is improved by introducing an accurate nuclear charge radius formula and an analytic expression for assaulting frequency.Within the improved effective liquid drop model(IMELDM),the... The effective liquid drop model(ELDM)is improved by introducing an accurate nuclear charge radius formula and an analytic expression for assaulting frequency.Within the improved effective liquid drop model(IMELDM),the experimental cluster radioactivity half-lives of the trans-lead region are calculated.It is shown that the accuracy of the IMELDM is improved compared with that of the ELDM.At last,the cluster radioactivity half-lives that are experimentally unavailable for the trans-lead nuclei are predicted by the IMELDM.These predictions may be useful for searching for new candidates for cluster radioactivity in future experiments. 展开更多
关键词 cluster radioactivity nuclear charge radius assaulting frequency effective liquid drop model
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NATURAL BACKGROUND RADIOACTIVITY LEVELS IN THE TERRESTRIAL ENVIRONMENT OF HONG KONG 认领 引用
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作者 关祖杰 余君岳 +1 位作者 杨健明 M.J.Stokes 《Nuclear Science and Techniques》 EI CAS 1993年第3期151-157,共7页
This paper analyses and summarizes the natural radionuclide contents of soil and building materials, radon concentrations and the penetrating radiation levels in Hong Kong. From these, a thorough and objective assessm... This paper analyses and summarizes the natural radionuclide contents of soil and building materials, radon concentrations and the penetrating radiation levels in Hong Kong. From these, a thorough and objective assessment for the terrestrial background irradiation level of Hong Kong was made. Finally, the annual effective dose equivalent received by Hong Kong people due to the natural background irradiation was calculated to be 3.2 mSv. 展开更多
关键词 Natural radioactivity Absorbed gamma dose rate Indoor radon Soil and building materials Background levels Effective dose equivalent
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Systematic study on the proton radioactivity of spherical proton emitters 认领 引用 被引量：4
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作者 Dong-Meng Zhang Lin-Jing Qi +3 位作者 De-Xing Zhu Yang-Yang Xu Song Luo Xiao-Hua Li 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第4期93-101,共9页
In this study, based on a two-potential approach, we systematically investigated the proton radioactivity half-lives of spherical proton emitters with 69≤Z≤81 from the ground and/or isomeric state, choosing the nucl... In this study, based on a two-potential approach, we systematically investigated the proton radioactivity half-lives of spherical proton emitters with 69≤Z≤81 from the ground and/or isomeric state, choosing the nuclear potential to be a modified Woods–Saxon potential that contains the isospin effect of the daughter nucleus. It was found that the calculated half-lives could reproduce the experimental data well. Furthermore, we extended this model to predict the half-lives of 17 protonemitting candidates whose radioactivity is energetically allowed or observed but not yet quantified in NUBASE2020. For comparison, the unified fission model, Coulomb potential and proximity potential model, universal decay law for proton emission, and new Geiger–Nuttall law were also used. All the predicted results are consistent with each other. 展开更多
关键词 Proton radioactivity Spherical nuclei Two-potential approach Modified Woods–Saxon potential Half-lives
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Assessment of Exposure Due to Technologically Enhanced Natural Radioactivity in Various Samples of Moroccan Building Materials 认领 引用 被引量：2
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作者 Bouchaib Kassi Aziz Boukhair +3 位作者 Khadija Azkour Mohamed Fahad Mohammed Benjelloun Abdel-Mjid Nourreddine 《World Journal of Nuclear Science and Technology》 CAS 2018年第4期176-189,共14页
The aim of our present work is to measure the specific activities of the radionuclides 226Ra, 232Th, 40K and the exhalation rates in terms of area and mass of 222Rn in some samples of building materials commonly used ... The aim of our present work is to measure the specific activities of the radionuclides 226Ra, 232Th, 40K and the exhalation rates in terms of area and mass of 222Rn in some samples of building materials commonly used in Morocco in order to evaluate the radiological risk caused by natural radioactivity. To this end, the analyses were carried out, using two nuclear techniques, namely high resolution gamma spectrometry and alpha dosimetry based on the use of LR115, on 50 samples collected from large commercial suppliers in Morocco. The results of these analyses show that the average specific activities of 226Ra, 232Th and 40K in these materials vary from 9 to 52 Bq/kg, 3 to 63 Bq/kg and 68 to 705 Bq/kg respectively. These activities remain within the permissible limits of 35 Bq/kg, 30 Bq/kg and 370 Bq/kg respectively, with the exception of a few samples of red brick, gray cement, ceramic and granite. The activity of the radium equivalent (Raeq), the internal (Hin) and external (Hex) hazard indices, the absorbed dose rate, the total annual effective dose , the excess lifetime cancer risk (ELCR) as well as volumic activities, exhalation rates in terms of area (ES) and mass (EM) are calculated for the samples analyzed in this work in order to assess the radiological risks resulting from the use of these materials in various construction activities. It seems that the values of these indices vary from 19 to 196 Bq/kg, 0.08 to 0.67, 0.05 to 0.53, 9 to 91 nGy/h, 0.05 to 0.56 mSv/y, 0.19 × 10&minus;3 to 1.96 × 10&minus;3, 72 to 350 Bq/m3, 56 to 273 mBq&sdot;m&minus;2&sdot;h&minus;1 and 3 to 15 mBq&sdot;kg&minus;1&sdot;h&minus;1 respectively. The lowest values are identified for gypsum, while the highest are attributed to granite. All of the obtained results of these indices respect the permissible limits except for the Raeq in some granite samples, the ELCR index in all samples except gypsum and the radon volumic activity in some gray cement samples, ceramic and granite. As a result, the different types of building materials analyzed in our work do not present a health risk to the public and can be used in various construction activities, with the exception of a few samples of red brick, gray cement, ceramic and granite. The choice of the use of red brick, gray cement and ceramic should be monitored and adapted according to the criteria of the limitation of the doses whereas the use of the granite must be moderate in order to limit over time the health risk which increases with the duration of exposure of humans to these building materials. 展开更多
关键词 Building Materials Natural Radioactivity Radionuclide Radon Exhalation Rate Radium Equivalent Annual Effective Dose
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