Berkeley Lab

Improved reconstruction of Cs contamination distribution in Fukushima measured with High-Efficiency Multimode Imager HEMI on board JAEA’s RMAX unmanned helicopter

rmax_image002In May 2014, a team from LBNL traveled to Fukushima, Japan to perform demonstration measurements for mapping Cesium contamination. In collaboration with the JAEA and University of Tokyo, our High Efficiency Multi-mode Imager (HEMI) was attached to an unmanned RMAX helicopter. HEMI is a Compton gamma-ray camera and thus measures the direction of the gamma-rays, which is not possible with typical spectroscopic detectors. Using this additional information, more accurate dose maps can be created on the ground to create more accurate maps compared to spectroscopic detectors.