胶片扫描法对低能X射线标准辐射场的研究  

Studay on Reference Radiation of Low-energy x-ray With Film Scanning

作　　者：马柯帆[1] 吴金杰[2] 王培玮[2] 杨元第[2] 段小娟[1] 

机构地区：[1]成都理工大学,成都610059 [2]中国计量科学研究院,北京100013

出　　处：《核电子学与探测技术》2012年第2期207-209,217,共4页Nuclear Electronics & Detection Technology

摘　　要：采用胶片剂量计测量了低能X射线辐射装置距X射线光管焦斑不同距离辐射野的大小,得出在距离光管焦斑1 000 mm的参考面辐射野大小及均匀性,并与二维矩阵电离室扫描结果进行了对比。实验结果表明,在距X射线光源焦斑1 000 mm处,在保证直径为100 mm的均匀野的条件下,非均匀性不大于1.5%。在保证非均匀性不大于5%和50%条件下,均匀野大小分别为130 mm和145 mm,满足了低能X射线空气比释动能基准装置量值复现,国际比对和向下量值传递的要求。The size of reference radiation field of low - energy x - ray was measured by film in different position from the tube spot, the diameter of the radiation field and its were obtained in reference plane （ 1 000 mm from the radiation source） and were compared with the results through two - dimensional ion chamber. The results show that the diameter of the radiation field is 100 mm within 1.5% （ 1 000 mm from the radiation source）. The diamerers of theradiation field are 130 nun and 145 mm within 5% and 50% . These results well meet the requirements of the value repetition of the low - energy X - ray air kerma value standard device, international intereomparison and transfer of quantity values.

关 键 词：X射线 胶片 标准辐射场 均匀性 

分 类 号：TB9[一般工业技术—计量学]