CAJ | 학술논문

本文从理论上分析了γ射线相机噪声的主要来源，并在能量分别为0.2 M eV和1.25 M eV γ射线源上标定不同辐照剂量条件下的噪声功率谱。研究结果表明，噪声主要由MCP像增强器增益起伏引起，在空间频率约为0.6331 mm －1处相对强度较强，该峰值在0.2 M eV和1.25 M eV γ射线辐照条件下基本保持不变，噪声功率谱为圆形对称分布，其强度随空间频率增大而快速减小。
본문종이론상분석료γ사선상궤조성적주요래원，병재능량분별위0.2 M eV화1.25 M eV γ사선원상표정불동복조제량조건하적조성공솔보。연구결과표명，조성주요유MCP상증강기증익기복인기，재공간빈솔약위0.6331 mm －1처상대강도교강，해봉치재0.2 M eV화1.25 M eV γ사선복조조건하기본보지불변，조성공솔보위원형대칭분포，기강도수공간빈솔증대이쾌속감소。
In this paper ,the theoretical analysis was presented on the major source of the noise in the γ‐ray camera .Based on the analysis ,the noise pow er spectrum of theγ‐ray camera was calibrated under γ‐ray radiation sources (0.2 MeV and 1.25 MeV energy ,respectively) of various irradiation dosages .The results show that the noise is mainly induced by the fluctuation of the gain of the MCP image intensifier . The remarkable noise peak occurs nearby the spatial frequency of 0.633 1 mm -1 .And almost the same phenomena are found with both 0.2 MeV and 1.25 MeV radiation energy .Be‐sides ,the noise power spectrum is in circular symmetrical distribution ,whose intensity rapidly decreases with the increase of the spatial frequency .