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气体探测器工作气体的选择对输出信号和探测效率都有着重要的影响。带电粒子通过气体时,由于与气体分子的电离而逐步损失能量,最后被阻止,而气体分子碰撞使得分子电离或激发,在粒子通过的径迹上产生大量的离子对(电子和正离子)。通过收集这些电离电子给出相应的电压信号,来确定热中子的信息。一般工作在常温下的充气电离室的工作气体是在Ar中加入少量N_2、CH_4、CO_2等,但甲烷和
The choice of gas detector working gas has an important influence on the output signal and detection efficiency. When the charged particles pass through the gas, the energy is gradually lost due to the ionization with the gas molecules, and finally the gas particles collide to make the molecules ionize or excite, thus generating a large number of ion pairs (electrons and positive ions) on the path through which the particles pass. By collecting these ionized electrons gives the corresponding voltage signal to determine the thermal neutron information. Generally work at room temperature in the inflatable ionization chamber of the working gas is to add a small amount of Ar N_2, CH_4, CO_2, etc., but methane and