本文介绍一种直接监测低浓度

β

放射性污水的多阳极丝扁平形大面积流气式计数管的设计参数、材料、制造工艺、使用方法及技术性能。计数管灵敏面积达1000cm

2

，反符合屏蔽管灵敏面积为2500cm

2

，在10cm铅屏蔽内，本底小于25cpm（比本底

<

0.025cpm/cm

2

）。

A flat type large area gas-flow counter with multi-wire anode was constructed in 1971 to monitor beta active waste with low specific activity directly. The design consideration

material

process of manufacture

operational method and technical performance of this counter are described.

The sensitive area of main counter is up to 1000cm

2

and that of anticoincidence counter is 2500cm

2

. With a 10cm thick lead shield the background count rate is less than 25cpm (specific background count rate is less than 0.025cpm/cm

2

) for the coincident type main counter.

For a thick sample of

90

Sr-

90

Y aqueous solution of 10

-10

Ci/l

the count rate is 15.6cpm.