In this paper, a programmable current source based simple, compact and low cost MOSFET dosimetry system is developed and characterized for the measurement of cumulative gamma radiation doses. The proposed readout system is microcontroller based which can be used to set-up different zero temperature coefficient currents ($I_{\mathrm{ZTC}}$) (range: $200\mathrm{\mu }\mathrm{A}$ – $400\mathrm{\mu }\mathrm{A}$) using digital rheostat and subsequently measuring changes in the threshold voltages of irradiated sensors. The proposed current source characterized by interfacing with six indigenously developed MOSFET sensors under gamma environments up to 1000 cGy with an average sensitivity of 5 mV/cGy and its performance is compared with commercially available Keithley’s source measurement unit, albeit at much lower cost and size. The comparison shows that the threshold voltage measured from both the systems differ less than 1%.

在本文中，开发了一种基于可编程电流源的简单，紧凑和低成本的MOSFET剂量测定系统，并对其进行了表征，以测量累积的伽马辐射剂量。所建议的读出系统基于微控制器，可用于设置不同的零温度系数电流（${\mathrm{一世}}_{\mathrm{ZTC}}$） （范围： $200\mathrm{\mu }\mathrm{一种}$ – $400\mathrm{\mu }\mathrm{一种}$），然后使用数字变阻器测量辐照传感器的阈值电压的变化。所建议的电流源的特点是在高达1000 cGy的伽马环境下与六个本地开发的MOSFET传感器接口，平均灵敏度为5 mV / cGy，其性能与市售的吉时利源测量单元进行了比较，尽管成本和尺寸要低得多。比较表明，两个系统测得的阈值电压相差不到1％。