To monitor nuclear and radiation emergencies,it is crucial to obtain accurate in situ measurements of the environmentalγ radiation dose rate from key radionuclides,particularly for large radioactive surface sources.T...To monitor nuclear and radiation emergencies,it is crucial to obtain accurate in situ measurements of the environmentalγ radiation dose rate from key radionuclides,particularly for large radioactive surface sources.The methods currently used for measuring dose rates are inadequate for obtaining the dose rates of key radionuclides and have large angular response errors when monitoring surface sources.To address this practical problem,this study proposes three methods for measuring the dose rate:the weighted peak total ratio,mean value regression,and numerical integration methods.These methods are based on energy-spectrum measurement data,and they were theoretically derived and numerically evaluated.Finally,a 1-m-long hexagonal radioactive surface source was integrated into a larger surface source.In situ measurement experiments were conducted on a large radioactive surface source using a dose-rate meter and a portable HPGespectrometer to analyze the errors of the three aforementioned methods and verify their validity.展开更多
According to the theory of actived charcoal adopting Radon, one of the radon measuring techniques using actived charcoal canisters is described in detail. Used in open country side, the actived charcoal canisters are ...According to the theory of actived charcoal adopting Radon, one of the radon measuring techniques using actived charcoal canisters is described in detail. Used in open country side, the actived charcoal canisters are designed, and the best depth and duration of them interred in soil are presented. Experiment proved that this method improved the precision of probe, and could find the small abnormity of radon easily.展开更多
文摘To monitor nuclear and radiation emergencies,it is crucial to obtain accurate in situ measurements of the environmentalγ radiation dose rate from key radionuclides,particularly for large radioactive surface sources.The methods currently used for measuring dose rates are inadequate for obtaining the dose rates of key radionuclides and have large angular response errors when monitoring surface sources.To address this practical problem,this study proposes three methods for measuring the dose rate:the weighted peak total ratio,mean value regression,and numerical integration methods.These methods are based on energy-spectrum measurement data,and they were theoretically derived and numerically evaluated.Finally,a 1-m-long hexagonal radioactive surface source was integrated into a larger surface source.In situ measurement experiments were conducted on a large radioactive surface source using a dose-rate meter and a portable HPGespectrometer to analyze the errors of the three aforementioned methods and verify their validity.
文摘According to the theory of actived charcoal adopting Radon, one of the radon measuring techniques using actived charcoal canisters is described in detail. Used in open country side, the actived charcoal canisters are designed, and the best depth and duration of them interred in soil are presented. Experiment proved that this method improved the precision of probe, and could find the small abnormity of radon easily.
