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FD—71晶体管小型闪烁辐射仪(或FD—117)在卫生防护和环境监测方面应用日益广泛,其优点是能测出微弱的γ射线,简便耐用,但要定期校准,不然误差较大。国际原子能机构133号技术报告《辐射防护仪器校准手册》对校准周期提出“除有法定要求的地方外,建议每个仪器每隔12个月校准一次”。该仪器说明书也注明更换晶体、光电倍增管等应重新校准。
FD-71 transistor small scintillation radiometer (or FD-117) in the health protection and environmental monitoring has been widely used, the advantage of weak gamma-ray can be measured, simple and durable, but to be calibrated regularly, or greater error. IAEA Technical Report No. 133 “Radiation Protection Instrument Calibration Manual” proposes for the calibration cycle “except where legally required, it is recommended that each instrument be calibrated every 12 months.” The instrument manual also states that the replacement of crystals, photomultiplier tubes should be recalibrated.