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本文描述了全套多探头弱α放射性闪烁计数装置的制造与调试。每套装置装有六个探头,可以同时测量六个α样品。各个探头的有效探测面积均为34平方厘米;本底介于1—5计数/小时之间;对面积为20平方厘米的PU~(239)源,当源到硫化锌(银)屏的距离为3—4毫米时,计数效率达33—66%(2π立体角内)。装置的长时间稳定性较好。本装置已满意地用于内照射和环境气溶胶常规样品的α放射性的测量。装置的设计,充分考虑到经济、实用和调试方便,如象采用二进位的定标单元电路和普通的电话通话计数器来记录弱α的脉冲数目;装置中12个光电倍加管共用一台稳定的高压电源供电。本装置所用的全部器材都可由国内供应。
This article describes the manufacture and commissioning of a full suite of multi-probe weak alpha scintillation counting devices. Each unit is equipped with six probes that can measure six α samples simultaneously. The effective detection area of each probe is 34 cm 2; the background is between 1 and 5 counts / hour; for PU 239 sources with an area of 20 cm 2, the distance from the source to the zinc sulfide (silver) screen For 3-4 mm, counting efficiency is 33-66% (2π solid angle). Long-term stability of the device is better. This device has been used satisfactorily for the measurement of alpha radioactivity of internal and ambient aerosol routine samples. The design of the device, taking into account the economic, practical and debugging convenience, such as the use of binary scaling unit circuit and the ordinary telephone call counter to record the number of pulses weak α; 12 photomultiplier tube device sharing a stable High-voltage power supply. All the equipment used in this device can be supplied domestically.