In order to search multiple radioactive sources and locate their coordinates as soon as possible , a de-tection system has been designed .The detection system based on azimuth measurements , and NaI detectors are used to identify the direction of the gamma sources .In this study ,MCNP software was used to do some simula-tions of searching multiple radioactive sources and locating their coordinates .The analog results show that the detection system can be used to get the coordinate of each radiation source in a radiation field produced by a plurality of radiation sources with a low positioning deviation .The detection system can be used to search for the missing gamma radiation sources and determine their space coordinates as soon as possible .%为实现对多个放射源的搜寻定位，设计了用于确定放射源坐标的探测系统。探测系统基于方位角测量，用NaI探测器辨别γ放射源的方向。利用MCNP软件进行多放射源搜寻定位模拟实验，结果表明探测系统能够在多个放射源形成的辐射场中实现对放射源的搜寻并确定其空间坐标，且坐标偏差较小。探测系统可用于搜寻丢失的γ放射源并尽快确定其空间坐标。
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