防护级γ射线参考辐射场的建立及辐射场的测定

ESTABLISHMENT AND DETERMINATION OF γ-RAY REFERENCE RADIATION FIELD WITH RADIATION PROTECTION LEVEL

本文介绍了本实验室建立的防护级γ射线参考辐射场 ,并对辐射场进行了测定和评价。对距源 1m处空气比释动能率测量 ,结果表明 :1 8.5GBq的137Cs源参考辐射场的空气比释动能率的不确定度为 4.6% ,74GBq的137Cs源参考辐射场的空气比释动能率的不确定度为 4.6% ,3 7GBq的6 0 Co源参考辐射场的空气比释动能率的不确定度为 4.2 %。同时也对辐射场大小和均匀性进行测量。这些结果表明散射辐射、辐射场的均匀性均符合ISO 40 3

This paper describes establish and of γ reference radiation fields with radiation protection level and its determination and evaluation. The Air Kerma Rate which is 1 meter from the source was measured.The results show that uncertainties of Air Kerma Rate are less than 4.6% for 137Cs(18.5?GBq),4.6% for 137Cs(74?GBq),4 2% for 60Co(37?GBq).The size of radiation field and its uniformity were also measured. These results show that scattering radiation and uniformity of radiation field accord with the ISO 4037.