气土 的衰变子体跟氡的一样 ,其大部分 (>90 % )在形成初期是带正电荷的。利用这一特性 ,在剂量计采样小室加静电场可大大提高测气土 灵敏度。利用驻极体在剂量计采样小室产生静电场 ,用CR - 39SSNTD记录气土 及其子体衰变释放的α粒子 ,从而提高了测气土 灵敏度。该方法将平行法测气土 和吸收体法测气土 的灵敏度分别提高为 8倍和 33倍 Earth’s decay descendants, like radon, most of them (> 90%) are positively charged at the beginning of formation. Use of this feature, in the dosimeter sampling chamber plus electrostatic field can greatly improve the sensitivity of soil testing. Using the electret to generate the electrostatic field in the dosimeter ’s sampling chamber, CR - 39SSNTD is used to record the α particles released from the decay of the soil and its daughters, so as to improve the sensitivity of the measured atmosphere. The method increases the sensitivities of gas and soil measured by parallel method to gas and soil respectively to 8 times and 33 times