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提出了在CR-39SSNTD受照面加一定厚度的吸收体甄别掉氡，从而实现直接被动积分测量水平的方法。这种甄别掉氡的方法会降低测灵敏度，但通过在采样小室加静电场的方法可以将测灵敏度大大提高。
A new method to measure the level of direct passive integrations by radon screening with a certain thickness of irradiated surface of CR-39SSNTD was proposed. This method of screening out radon reduces the sensitivity of the measurement, but the sensitivity of the measurement can be greatly improved by adding an electrostatic field in the sampling chamber.