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在核辐射测量中,经常会遇到微弱电流(10-10～10-15A)的测量。高气压电离室(HPIC)作为一种气体探测器,具有量程广、探测下限低和环境适应性强等特点,因而广泛应用于环境辐射监测以及本底调查等领域,但是它产生的微弱电流信号幅度极低,通常在nA、pA甚至fA量级,非常易受外界电磁场、漏电流的干扰,所以对其进行测量有较大的难度。
In nuclear radiation measurement, we often encounter the weak current (10-10 ~ 10-15A) measurement. High pressure ionization chamber (HPIC) as a gas detector with wide range, low detection limit and environmental adaptability and other characteristics, which are widely used in environmental radiation monitoring and background investigations and other fields, but it produces weak current signal Extremely low amplitude, usually in the nA, pA or even fA magnitude, very susceptible to external electromagnetic fields, leakage current interference, so its measurement is more difficult.