摘要
目的 对新研制的复式三野电离室的性能进行测试与分析。方法 使用NERO 6 0 0 0B测试仪、弱电流计、RF 5 0 0mAX线机、MD 10 0显微密度计等仪器设备 ,采用直接法测量新型复式三野电离室的时间特性、线量率特性和线质特性 ;间接 (摄片 )法测量其电流特性、电压特性和被摄体厚度特性 ,并对测量结果进行分析。结果 时间特性和线量率特性均具有满意的线性度 (其线性回归系数分别为R =0 9996 1和R =0 99888) ;线质特性稳定 (最大输出变化Δmax≤± 5 % ) ;电流特性、电压特性和被摄体厚度特性均优良 (其照片密度的变化量分别是ΔDmax≤± 0 0 1,ΔDmax≤± 0 15和ΔDmax≤± 0 0 6 ) ;且重复性好 (曝光时间、射线剂量的重复性误差分别为ΔTmax≤± 0 0 0 4s和ΔXmax≤ 0 0 1×10 -5C/kg)。结论 该新型电离室性能优良、稳定 ,具有实用价值。
Objective To test and analyse the characteristics of double three field iono chamber developed by ourselves. Methods We tested the time characteristic, dose rate characteristic and X ray quality characteristic by using direct test method, and current characteristic, voltage characteristic and thickness characteristic of double three field iono chamber by using photograph test method with NERO 6000B test meter, RF 500 mA X ray equipment and so on. The results were analysed. Results The time characteristic and dose rate characteristic had satisfied linear scales(the return coefficients of linety scales were R =0.999 61 and R = 0.998 88 respectively). The X ray quality characteristic was steady (the maximum output variation was Δ max ≤±5%). The good characteristics of current, voltage and thickness were found(the maximum variations of film density were ΔD max ≤±0.01, ΔD max ≤±0.15 and ΔD max ≤±0.06 respectively). The excellent repeat was showed (repeating error of exposure time and dose were ΔT max ≤±0.004 s and ΔX max ≤0.01×10 -5 C/kg). Conclusion The performace of the new Iono chamber is excellent and steady, so it has practical value.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2001年第7期516-518,共3页
Chinese Journal of Radiology
基金
山东省卫生科技发展计划基金 (94 96 0 19)
