[1A06-13] Contamination Measurement Techniques

4:15 PM - 4:30 PM JST(7:15 AM - 7:30 AM UTC)

[1A12] Development of Tungsten Pinhole Collimators for the Portable Gamma-ray Imaging Device GeGI5 and Quantitative Evaluation of Their Effects

*Kiyokazu Tsugane¹, Go Yoshida¹, Hiroshi Matsumura¹, Akihiro Toyoda¹, Hajime Nakamura¹, Kazuyoshi Masumoto¹, Taichi Miura¹ (1. KEK)

Keywords:

Portable Gamma-ray Imaging Device,GeGI5,Accelerator,Activation

The portable gamma-ray imaging device "GeGI5" achieves activation imaging by equipping a shielding body with a standard lead-antimony alloy pinhole collimator of 5 mm diameter. To make the activation specific to accelerator facilities more visible, additional tungsten alloy collimators with diameters of 5 to 9 mm were fabricated and their performance was quantitatively evaluated using reference sources. In the region above 1000 keV gamma rays, changing the material improved the resolution by 1.3 times, and increasing the diameter resulted in the signal-to-noise ratio (S/N) by up to about 2 times.