Advancement of airborne radiation measurement technology, 2; Estimation of vertical distribution of radiocesium in soil using an unmanned helicopter

Ochi, Kotaro   ; Sasaki, Miyuki  ; Ishida, Mutsushi*; Sanada, Yukihisa   

In previous studies, our group have developed the airborne radiation measurement (ARM) technique. We mounted a radiation detector under an unmanned aerial vehicle to evaluate the deposition of Fukushima accident-derived radiocesium over wide area. In this study, we performed ARM with mounting a LaBr(Ce) detector under an unmanned helicopter. A rapid and simple estimation of depth profile of radiocesium in soil was developed on the basis of the relationship between spectra obtained via ARM and actual depth profile of radiocesium. Our goal is same to series 1 that we attempt to achieve the advancement of airborne radiation measurement technique.