柱型电离室常用于测量电子束的辐射剂量。高能电子束产生的次级电子穿射柱型电离室的灵敏体积时 ,在电离室空气腔、电离室壁以及测量体模中的通量不同 ;同时由于存在剂量梯度 ,使有效测量点由电离室几何中心向电子束入射方向偏移。柱型电离室有效测量点的偏移量在电子束吸收剂 Cylindrical ionization chamber is commonly used to measure the radiation dose of electron beam. The flux of the secondary electrons generated by the high-energy electron beam passing through the cylindrical ionization chamber is different in the air chamber of the ionization chamber, the wall of the ionization chamber and the measurement phantom. At the same time, due to the dose gradient, the effective measurement point is ionized The geometric center of the chamber is offset towards the incident direction of the electron beam. The column ionization chamber effectively measures the amount of shift in the electron beam absorber