Prediction of the bias currents induced by 60Co via dose and dose rate

Abstract

Dose- and dose-rate-dependent bias current is a crucial parameter in determining the physical properties of the arithmetic amplifier. The first objective of this work is to examine the enhancement of bias currents in one type of arithmetic amplifier produced by 60Co radiation. Substantial differences of the bias current are observed. Secondly, based on the calculated results from the nonlinear curve fitting method, the dose-dependent bias current is theoretically explained successfully via a function. The simulations agree very well with the observed curves (bias current versus dose). The minimum correlation coefficient between the experimental and calculated data is 0.998. The average relative errors between the measured and modeled values do not exceed 3.85% in all considered cases. Finally, the mathematical relationships between the parameters, which are used to link the bias current and dose, and dose rate are obtained. Consequently, the enhancement of the bias current can be predicted by both dose and dose rate, using only one function. To my knowledge, the effects of the 60Co on the bias current of arithmetic amplifier are quantitatively discussed for the first time.