摘要
采用石墨空腔电离室NE2561测量了中能X射线标准辐射场各点的剂量率,结果显示在非均匀性不大于1%的条件下,离X射线管焦斑1 200 mm处得到直径约为45 mm的均匀场。采用内插法测量80 kV能量点过滤X射线参考辐射束的第一半值层和第二半值层。结果显示辐射场均匀性和辐射质均符合ISO 4037的要求。
The dose rate of reference radiation of medium-energy X-ray in different position was measured by＇cylindrical cavity ionization chamber NE2561 which was positioned in reference plane （1200 mm from the radiation source）. The results show that the diameter of the radiation field is 45 mm within 1% nonuniformity. The first half-value layer and the second half-value layer of reference radiation of filtered x- rays were also measured by integral interpolation when the high voltage of x-ray tube was set in 80 kV. These results show uniformity of radiation filed and radiation quality accord with ISO 4037.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2010年第7期949-951,共3页
Nuclear Electronics & Detection Technology
关键词
X射线
标准辐射场
均匀性
半值层
x-ray, reference radiation, uniformity, half-value layer
