光纤传输型便携式大面积表面污染监测仪的实验研究

Research on Fiber-based Portable Large Area Surface Contamination Monitor

以β放射性表面污染测量为对象,基于薄片式大面积塑料闪烁体探测器,建立了光纤传输型大面积塑料闪烁体表面污染监测仪实验装置,探测灵敏面积达1 200 cm2。初步实验表明,在10根光纤作为光收集的条件下,对90Sr-90Yβ面源的探测效率可达到7%。该探测器具有面积大、结构简单、环境适用性强等优点,未来可用于大面积β核素放射性表面污染的测量。

Large area portable surface contamination monitor is suitable for searching the hot point, especially in the situations of large contamination area such as work site radioactive monitoring, nuclear facility decommissioning or nuclear emergency response. This paper focus on beta radioactive surface contamination. Through researching upon the detector which is made of large area plastic scintillation coupled with fibers, the first large area plastic scintillation surface contamination monitor was established. The effective area of detector reaches 1 200 cm2. The verifying experiments indicates that the detection efficiency to 90Sr-90Y plate source comes to 7%. The results show this kind of detector is competent for beta radioactive surface contamination. This work laid a foundation for research and development of the relative instrument.