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采用局部静态法测量介质表面的氡析出率时 ,受表面同时析出 土气的影响 ,测量值可能偏高。由于土气子体 2 16Po的半衰期T1/2 =0 .1 5s,在设计氡析出率测量装置时 ,合理选择采样器高度可有效减小甚至克服 土气对氡析出率的测量影响。用采样截面为1 88mm、高 1 2 5mm、内加静电场 (由直流电源或驻极体产生 )的采样器 ,采样周期分别为 1、2和 3h ,被测介质表面 土气析出率比氡的高 2个数量级条件下 ,研究了氡析出率受 土气干扰的程度。理论计算结果表明 :采用CR 39固体核径迹探测器的驻极体多功能快速测氡仪和电源式多功能快速测氡仪测量氡析出率时 ,测量结果受 土气的干扰可能偏大 35 5 % ,而采用金硅面垒作探测器的PCMR 1连续测氡仪测量 ,氡析出率受 土气的干扰可忽略不计。
When the local static method is used to measure radon precipitation rate on the medium surface, the measured value may be high due to the simultaneous precipitation of the soil surface. Due to the half-life of 216Po, T1 / 2 = 0.151s, the reasonable choice of sampler height can effectively reduce or even overcome the measurement of radon exhalation rate in the design of radon precipitation rate measuring devices. With sampling section 1 88mm, high 1225mm, plus the electrostatic field (generated by the DC power or electret) sampler, the sampling period is 1, 2 and 3h, the surface of the measured medium precipitation rate of radon than radon Under the conditions of high 2 orders of magnitude, the degree of radon exhalation rate disturbed by the soil was studied. The theoretical calculation results show that when the radon exhalation rate is measured by the Electret multi-function radon detector with CR 39 solid nuclear track detector and the power multi-function rapid radon detector, the measurement result may be greatly disturbed by the soil gas 35 5 %, While the PCMR 1 continuous radon detector using gold silicon surface base detector as a detector, radon precipitation rate by the interference of the soil can be neglected.