RJ32-2106P和AT1123两种Χ-γ剂量率仪响应时间性能研究

目的 探讨国内医用X射线诊断工作场所放射防护检测中存在的问题,试验比较国产和进口两款X-γ剂量率仪响应时间性能,评估其在医用X射线诊断工作场所放射防护检测中的适用性。方法 在一台医用X射线摄影机上,使用固定的管电压（70 kV）,分别设定不同的管电流获取高中低三档剂量,曝光时间从10 ms递增至1 000 ms,记录不同曝光时间下两种X-γ剂量率仪的周围剂量当量率读数。结果 国产RJ32-2106P型X-γ剂量率仪在3档剂量水平的X射线中,低剂量档时间响应为160 ms,中、高剂量档对应的响应时间为50~64 ms;AT1123的响应时间在3个剂量档均稳定在80~100 ms左右。结论 在医用X射线诊断机房防护检测时,应根据X射线辐射场,选择能够测量短时间出束和脉冲辐射场的设备进行测量。RJ32-2106P和AT1123X-γ剂量率仪在不同剂量水平下时间响应在200 ms以内,适用于医用X射线诊断机房的放射防护检测。

Study on response time performance of RJ32-2106P and AT1123 X-γ ray dose rate meters

Objective To investigate the problems existing in radiological protection monitoring of medical X-ray diagnostic workplaces in China, compare the response time performance of domestic and imported X-γ ray dose rate meters, and evaluate their applicability in radiation protection detection of medical X-ray diagnostic workplaces.Methods On a medical X-ray radiography device, the voltage(70 kV) was fixed. High middle and low doses were obtained by setting different tube currents and the exposure time was increased from 10 ms to 1 000 ms. The equivalent dose rate readings of the two kinds of X-γ ray dose rate meters under different exposure time were recorded.Results The response time of domestic RJ32-2106P X-γ ray dose rate meters was 160 ms for the low dose range, and 50~64 ms for both middle and high dose range. The response time of AT1123 was about 80~100 ms for all three dosage ranges.Conclusion The equipment that can measure the short time beam and the pulse radiation field should be selected in the radiological protection monitoring of medical X-ray diagnostic room. RJ32-2106P and AT1123X-γ ray dose rate meters both have a time response of less than 200 ms at different dose levels. They are suitable for radiological protection detection of medical X-ray diagnostic rooms.