Spectral resolution evaluation by MCNP simulation for airborne alpha detection system with a collimator

Nuclear Engineering and Technology

Hee Reyoung Kim¹  Min Ji Kim²  Si Hyeong Sung² 

[1] Corresponding author.;Nuclear Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulsan, 44919, Republic of Korea;

关键词: Alpha detection;    Spectral resolution;    Detection efficiency;    Monte Carlo simulation;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this study, an airborne alpha detection system, which consists of a passivated implanted planar silicon (PIPS) detector and an air filter, was developed. A collimator applied to the alpha detection system showed an enhancement in resolution and a degradation in detection efficiency. The resolution and detection efficiency were compared and analyzed to evaluate the performance of the collimator. Thus, the resolution was found to be more important than the efficiency as a determining factor of the detection system performance, from the viewpoint of radionuclide identification. The performance was evaluated on three properties of the collimator: hole shape, hole length, and the ratio between the hole and frame pitches. From the hole shape performance evaluation, a hexagonal collimator showed the highest resolution. Further, the collimator with a hole pitch of 14 mm was found to have the highest resolution while that with a frame pitch of 4–6 mm (i.e., 1.2–1.4 times longer than the hole pitch) showed the highest resolution.

【 授权许可】

Unknown