基于水热法的新型NMi正交电压X射线对水的吸收剂量初级标准。
The new NMi orthovolt x-rays absorbed dose to water primary standard based on water calorimetry.
作者信息
de Prez L A, de Pooter J A
机构信息
Nederland Meetinstituut, Thijsseweg 11, 2629 JA Delft, The Netherlands.
出版信息
Phys Med Biol. 2008 Jul 7;53(13):3531-42. doi: 10.1088/0031-9155/53/13/009. Epub 2008 Jun 13.
A new water calorimeter for orthovolt x-rays has been developed at NMi. The purpose of this calorimeter is to provide calibrations in terms of absorbed dose to water. Four internationally accepted CCRI qualities (100-250 kV) have been characterized. Correction factors have been determined with measurements, Monte Carlo calculations and heat transport models. The results of the calculations have been validated against measurements. The absorbed dose to water calibration coefficient, N(Dw,WCM), with the new calorimeter has been compared to the N(Dw,NCS) based on an air-kerma calibration coefficient, using the current NCS-10 dosimetry protocol. A good agreement is found for all beam qualities where the total uncertainty (1 SD) has decreased from 2.5% for N(Dw,NCS) to better than 1.5% for N(Dw,WCM), using the new water calorimeter.
荷兰国家计量院（NMi）研发出一种用于正交电压X射线的新型水热计。这种热计的目的是提供水吸收剂量方面的校准。已对四种国际认可的CCRI质量（100 - 250 kV）进行了特性描述。通过测量、蒙特卡罗计算和热传输模型确定了校正因子。计算结果已通过测量进行了验证。使用当前的NCS - 10剂量测定协议，将基于新型热计的水吸收剂量校准系数N(Dw,WCM)与基于空气比释动能校准系数的N(Dw,NCS)进行了比较。对于所有束流质量，均发现良好的一致性，使用新型水热计时，总不确定度（1标准差）已从N(Dw,NCS)的2.5%降至N(Dw,WCM)的优于1.5%。
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