高能X射线光机性能研究
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摘要
X射线光机的管电压、管电流及固有过滤是X射线光机质量控制的重要参数。X射线光机管电压、管电流以及固有过滤的测量,对于X射线光机的性能评价和参考辐射质的建立是非常必要的。以一台管电压上限为600 k V的X射线光机为例,用能谱终点法测量对X射线光机的管电压进行测量,得出X射线光机能在±1%的范围内显示管电压值;用指型电离室PTW30013测量了高能X射线光机管电流的线性及稳定性,在相同的管电压、管电流下,实际测量到的管电流的相对标准偏差在0.097%;分别用半值层法和外推法测量高能X射线光机的固有过滤,两个结果取平均值得到高能X射线光机固有过滤为0.146 mm Al。
Voltage、current and the inherent filtration were important elements of X-ray facility. It is necessary to measure the voltage、current and inherent filtration of the X-ray facility in order to establish a reference radiation quality or to evaluate the facility. We take an X-ray facility for example,the max voltage of the facility is 600 k V. We use a HPGe detector to measure the voltage of the facility,make out that the facility can reveal the voltage in a range of ± 1%. We use a PTW30013 ionization chamber to measure the current. The relative standard deviation of the current is 0. 097%. We use two methods to measure the inherent filtration of the facility. The average of the two methods is equivalent to 0. 146 mm Al.
Voltage、current and the inherent filtration were important elements of X-ray facility. It is necessary to measure the voltage、current and inherent filtration of the X-ray facility in order to establish a reference radiation quality or to evaluate the facility. We take an X-ray facility for example,the max voltage of the facility is 600 k V. We use a HPGe detector to measure the voltage of the facility,make out that the facility can reveal the voltage in a range of ± 1%. We use a PTW30013 ionization chamber to measure the current. The relative standard deviation of the current is 0. 097%. We use two methods to measure the inherent filtration of the facility. The average of the two methods is equivalent to 0. 146 mm Al.
引文
[1]蒋伟,吴金杰,方方,等.一种便携式X光机的能谱及管电压测量研究[J].核电子学与探测技术,2013,(10):1229-1233.
[2]International Organization for Standardization.X and Gamma Reference Radiation for Calibrating Dosemeters and Doserate Meters and for Detemining their Response as a Function of Photon Energy–part 1:Radiation Characteristics and production methods:ISO 4037-1[S].1996.
[3]周旭.HXMT高能望远镜地面标定装置建设与标定方法研究[D].中国科学院大学,2015.
[4]吴金杰,郭彬,李兵,等.介入法测量工业X射线机管电压的研究[J].计量学报,2015,36(5):550-554.
[5]欧向明,李明生,赵士庵,等.MG325型X射线机固有过滤铝当量厚度的测定[J].中华放射医学与防护杂志,2012,32(2):216-217.
[2]International Organization for Standardization.X and Gamma Reference Radiation for Calibrating Dosemeters and Doserate Meters and for Detemining their Response as a Function of Photon Energy–part 1:Radiation Characteristics and production methods:ISO 4037-1[S].1996.
[3]周旭.HXMT高能望远镜地面标定装置建设与标定方法研究[D].中国科学院大学,2015.
[4]吴金杰,郭彬,李兵,等.介入法测量工业X射线机管电压的研究[J].计量学报,2015,36(5):550-554.
[5]欧向明,李明生,赵士庵,等.MG325型X射线机固有过滤铝当量厚度的测定[J].中华放射医学与防护杂志,2012,32(2):216-217.