高能γ射线参考辐射场空气比释动能（率）测定

AIR KERMA MEASUREMENT FOR HIGH ENERGY GAMMA

本文主要介绍了用两种不同体积（３ｃｍ￣３和５０ｃｍ￣３）的石墨空腔电离室对静电加速器上通过￣（１９）Ｆ（Ｐ、α、γ）￣（１６）Ｏ反应产生的６－７ＭｅＶγ射线参考辐射和在游泳池反应堆上通过Ｎｉ的中子俘获反应产生的７－９ＭｅＶγ射线参考辐射的空气比释动能Ｋ＿ａ的测量方法和结果。测量Ｋ＿ａ的总不确定度为４．２％。此电离法测量结果与高纯锗谱仪注量法测量结果在实验误差范围内符合。

This paper presents the measurement method and results for 6-9 MeV gammaradiation as well as brief light on reference radiation fields at this energy which have estab-lished in the neutron group of our centre.Air kerma measurement is performed by sphericalgraphite cavity chambers whose collective volume is 3 and 50 cm￣3,respectively.Having discussed the parameters needed for air kerma evaluation and determined their values,final results are given with total uncertainly about 4.2%,which are consistent well with that deter-mined by spectrum method within the uncertainties.