Development of Dosimeter for Non-ionizing Radiation

研制了一种用于磁场剂量测量的计算机驱动三维磁通计。适用于被测物的磁场剂量计应能测量局部磁场强度的绝对值，并能记录其时间积分，作为磁场暴露剂量的量度，该通量计由信号放大器、整流器、A/D转换器和袖珍计算机组成。传感器输出的信号经PC机处理后，构成磁场磁通密度的绝对强度及其时间积分值。整个系统由电池驱动，体积小，便于携带，文中详细介绍了系统的设计、结构、技术指标和测试结果。在正常工作模式下，可测范围为0.4 ~ 20000 G，在高灵敏度交流工作模式下，可测范围为8 mG ~ 400 G，且灵敏度与磁场方向无关。这些测量数据在PC机的LCD面板上真实的实时显示并存储在RAM文件中。讨论了磁通计的可能应用，特别是对大型螺旋装置和其它磁系统漏磁场的探测。包括对强磁场工作人员剂量控制的意见。

Computer-driven, three dimensional magnetic fluxmeter to be used for magnetic field dosimetry has been developed. A magnetic field dosimeter applicable to the object should be measurable to the absolute value of local magnetic field strength and alsobe able to record its time integration as a measure of exposed dose to the magnetic field.This flux meter consists of signal amplifiers, rectifires, an A/D converter and a pocket computer. The signal outputs from sensors are processed with the PC to compose the absolute strength of the flux density of the magnetic field ans its time integrated value. The whole system is driven by battery and it is quite compact in size to be used as a handy portable system.Further details of the design, construction, specification and testing results are described. The measurable ranges are from 0.4G to 20,000G in normal mode and 8mG to 400G in high sensitivity AC mode, and the sensitivity is well independant to the magnetic field direction. These measured data are displayd in real time on the LCD pannel of the PC and memorized in RAM files. Possible application of the flux meter are discussed with special attention to the search of the leakage flux of the magnetic fields of LHD(Large Helical Device) and other magnetic systems. including the comments on dose control of the workers under strong magnetic fields exposures.