【摘要】 介绍了T34035型H_p(10)次级标准电离室的结构和技术特性,实验测量了H_p(10)次级标准电离室的校准系数N_H和修正因子k(R,α),并评定给出校准系数N_H的相对扩展不确定度为4.6%(k=2),修正因子k(R,α)的相对扩展不确定度为6.0%(k=2)。在辐射质入射角≤75°时,12～1 250 keV范围内能量响应好于±20%;个人剂量当量率非线性在100μSv/h～3 Sv/h范围内好于±3%。采用MCNP5模拟计算了该电离室对部分窄谱N系列和低空气比释动能L系列的k(R,α)值,结果表明计算值与实验测量值之间的相对误差在±6%范围内。说明该电离室性能满足次级标准电离室要求,可以直接用于H_p(10)量值的传递。更多还原

【Abstract】 The structure and technical characteristics of T34035 H_p(10) secondary standard ionization chamber are introduced. The calibration coefficient NH and correction factor k(R, α) of H_p(10) secondary standard ionization chamber are measured. The uncertainty of the calibration coefficient N_H is 4.6%(k=2), and the uncertainty of the correction factor k(R, α) is 6%(k=2). When the radiation incident angle is less than 75 degrees, the energy response is better than ±20% in the range of 12 keV-1 250 keV, and the non-linearity of personal dose equivalent rate is better than ±3% in the range of 100 μSv/h-3 Sv/h. The k(R,α) values of some narrow spectrum N series and low air specific kinetic energy L series are simulated by MCNP5. The results show that the error between the calculated value and the measured value is within the range of ±6%. The ionization chamber meets the requirements of the secondary standard ionization chamber and can be used directly for the transmission of H_p(10) value.更多还原