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吸入含有氡、(气土)子体的空气会使人体肺组织受到电离辐射的照射,多年来人们对测定氡、(气土)子体浓度的方法进行了大量的研究,归纳起来可分为两类:(1)总α放射性测量法。滤膜采样后,用α探测装置测定RaA和RaC′放出的总α计数,从而计算出RaA、RaB和RaC浓度。由于测量条件和需要测定的核素不同,而选择各种各样的测量时间。(2)α能谱学方法,可更准确地测定氡子体的浓度。滤膜采样后,在两段时间内用α谱仪测定滤膜上RaA衰变放出的6MeV和RaC′衰变产生的7.68MeV的α计数,从而算出RaA、RaB和RaC浓度。
Inhalation of air containing radon and (soil) progeny causes human lung tissue to be exposed to ionizing radiation. Many studies have been conducted on methods of determining radon and (soil) progeny concentrations over the years and can be summarized into Two categories: (1) total alpha radioactivity measurement. After the membrane was sampled, the total α counts released by RaA and RaC ’were measured with an α detection device to calculate the RaA, RaB and RaC concentrations. Due to the measurement conditions and the need to determine different nuclides, and choose a variety of measurement time. (2) Alpha spectroscopy to determine the concentration of radon progeny more accurately. After the membrane was sampled, the concentrations of RaA, RaB and RaC were calculated by measuring the α counts of 6MeV released by RaA decay on the membrane and 7.68MeV produced by RaC ’decay over a period of time.