Enhanced directional detection of gamma sources

摘要: Abstract Radiation measurement is an effective way to detect and locate nuclear threats. Moving the detector monitoring count rate during searches a common for finding source. To minimize exposure prevent operators from getting too close source, alternative method locating source by occlusion devised. This work explores use of two NaI detectors absorber estimating direction radiation Measurements were carried out located between 0° 90° in 15° intervals. The ratios total counts detector, full-energy peaks, mean energy spectrum far-side near-side as function angle are studied 57Co, 60Co, 137Cs, 232Th sources. Comparisons made placing piece tungsten or stainless steel plate with no absorber. When metal sandwiched detectors, spectra change more quickly angle. Furthermore, gamma attenuation higher than steel. As result, useful direction. data also analyzed dividing into three windows examine ratio each window detectors. It found that 137Cs 60Co can be deduced using reference. In order reduce size, weight, power man-portable unmanned systems, it feasible only inserted in-between obtain