DuSautoy A R
National Physical Laboratory, Teddington, Middlesex, UK.
Phys Med Biol. 1996 Jan;41(1):137-51. doi: 10.1088/0031-9155/41/1/011.
A description is given of the UK primary standard graphite calorimeter system. The calorimeter measures absorbed dose to graphite for photon radiations from 60Co to 19 MV x-rays, and is the basis of the NPL therapy-level absorbed dose to water calibration service. Absorbed dose to graphite from the photon calorimeter has been compared with three other standards: an ionization chamber and cavity theory, for 60Co gamma radiation; the NPL electron calorimeter, for 12-14 MeV electron beams; and the BIPM 60Co absorbed dose standard. The three standards agreed within 0.5% which is similar to the measurement uncertainties.
本文描述了英国的初级标准石墨量热计系统。该量热计可测量从60Co到19MV X射线的光子辐射在石墨中的吸收剂量，并且是英国国家物理实验室（NPL）水吸收剂量校准服务的治疗水平的基础。光子量热计在石墨中的吸收剂量已与其他三种标准进行了比较：对于60Co伽马辐射，采用电离室和空腔理论；对于12 - 14MeV电子束，采用NPL电子量热计；以及国际计量局（BIPM）的60Co吸收剂量标准。这三种标准的结果在0.5%以内相符，这与测量不确定度相近。
