MOS CAPACITOR-BASED, ACCUMULATING, RADIATION-SENSITIVE DETECTOR FOR OCCUPATIONAL, ENVIRONMENTAL AND MEDICAL DOSIMETRY

摘要

A low-power wireless ionizing radiation measurement system is present that is intended to be used in a wearable dosimeter for occupational radiation monitoring. The detector element is a custom MOS capacitor that traps holes in proportion to the amount of ionizing radiation incident upon the detector, thus permanently causing a lateral shift in the CV-curve (toward more negative threshold voltage). The circuit measures the capacitance value of several redundant sensors at a given voltage in the depletion region, records this value over time and occasionally transmits the stored values to a base station. From the change in capacitance, the dose that has been delivered can be determined.