Digital CMOS dosimeters

Several radiation dosimeters are presented. They are intended to be used as built-in sensors in integrated circuits signaling misfunction danger due to radiation exposure. All are CMOS circuits compatible with standard technology using PMOSFET sensors. Two types are investigated. The first, called threshold dosimeter, has a binary output that changes its state when the total radiation dose exceeds a prefixed level. The second type is a new kind of linear dosimeter, giving a frequency dependence of the total absorbed dose. Details of the operation, circuit fabrication and experimental results are given.