【摘要】 本文介绍对一种带烧结金属过滤器的活性炭累积氡采样器的改进研究。在我们以前研制的具有优良抗温湿度变化性能的采样器基础上，选择了吸氡和耐湿性能更好的活性炭品种及其装填量，显著增加了探测器对氡浓度的响应。改进后采样器的积分时间常数约为４．３ｄ。当采样器与高纯锗γ谱仪组成氡探测器时，在暴露７ｄ的条件下，刻度因子为０．５１８ｍｉｎ－１·Ｂｑ－１·ｍ３。在本底与样品测量时间为１０００ｍｉｎ时，最低可探测氡浓度为０．２８Ｂｑ·ｍ－３。该探测器适用于在温度和相对湿度显著变化的条件下准确测量室内和外环境空气中的平均氡浓度更多还原

【Abstract】 Improvements have been made on passive activated charcoal 222 Rn samplers with sintered metal filters.Based on the samplers of good adaptability to temperature and humidity developed before,better charcoal was selected to further improve their performance in radon absorption ability and moisture resistance.And charcoal quantity in samplers was strictly controlled.The integration time constant of the improved samplers was about 4 3 days.As the sampler was combined with gamma spectrometer to measure radon concentration,the calibration factor was 0 518 min -1 ·Bq -1 ·m 3 for samplers of 7 days exposure time,and the minimum detectable concentration 0 28 Bq·m -3 if counting time for both background and sample is 1 000 minutes.The improved samplers are suited to accuraely determine the indoor and outdoor average radon concentration under conditions of great variation in temperature and humidity. (更多还原