J. Falkner and C.M. Marianno, “Modeling minimum detectable activity as a function of detector speed”, Radiation Detection Technology and Methods 3, 3 (2019).
A radiation detector’s sensitivity is important when designing survey plans. A measure of sensitivity is minimum detectable activity (MDA) which is the lowest amount of activity required for a signal to be distinguished above background. It has been known for some time that the efficiency of a moving detector can be improved by slowing the speed of travel. The Multi-Agency Radiation Survey and Site Investigation Manual describes but does not quantify this effect. Decreased efficiency at higher speeds results in higher MDAs and thus less sensitive detectors. The purpose of this research is to specifically define the relationship between detector MDA and speed.