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我所研制了BPS型TE-TE球形空腔电离室。本工作测量了这些电离室的基本性能。饱和特性的测量结果表明,在~(60)Co光子场中Q_B/Q_V与V~(-2)之间,关系是线性的,相关系数极接近于1,由此得出了饱和修正因子。对于15MeV中子和~(60)Co光子确定了自由空气比释动能的壁厚修正因子,各自为(0.6±0.9)·10~(-2)mm~(-1)和(0.49±0.35)·10~(-2)mm~(-1)当射线入射角度范围在0-120°范围时,室响应相对变化对于~(60)Coγ射线不大于0. 5％,而对于15 MeV中子大约为1％。还研究测定了自由空气照射电离室在光子场与中子场中柄散射的影响,测量和计算了用TE气体和空气分别作为工作气体时电离室读数之比值,结果相符。
I developed a BPS TE-TE spherical cavity ionization chamber. This work measured the basic performance of these ionization chambers. The measurement results of the saturation characteristics show that the relationship between Q_B / Q_V and V ~ (-2) in the ~ (60) Co photon field is linear and the correlation coefficient is very close to 1, thus the saturation correction factor is obtained. Wall correction factors for free-air kerma were determined for 15 MeV neutrons and ~ (60) Co photons, respectively (0.6 ± 0.9) · 10 ~ (-2) mm ~ (-1) and (0.49 ± 0.35) · 10 ~ (-2) mm ~ (-1) When the ray incident angle is in the range of 0-120 °, the relative change of chamber response is not more than 0.5% for the ~ (60) Coγ ray, while for the 15 MeV neutron About 1%. The influence of free air irradiation on the stalk scattering in the photon field and the neutron field was also studied. The ratio of ionization chamber readings was measured and calculated using TE gas and air as the working gas respectively.