1. Spectral resolution evaluation by MCNP simulation for airborne alpha detection system with a collimator
- Author
-
Min Ji Kim, Hee Reyoung Kim, and Si Hyeong Sung
- Subjects
Materials science ,Spectral resolution ,genetic structures ,Silicon ,020209 energy ,Monte Carlo method ,Alpha detection ,chemistry.chemical_element ,02 engineering and technology ,Detection efficiency ,030218 nuclear medicine & medical imaging ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,Optics ,Planar ,law ,0202 electrical engineering, electronic engineering, information engineering ,Monte Carlo simulation ,Air filter ,business.industry ,Detector ,Resolution (electron density) ,Collimator ,lcsh:TK9001-9401 ,humanities ,Nuclear Energy and Engineering ,chemistry ,lcsh:Nuclear engineering. Atomic power ,business - Abstract
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.
- Published
- 2021