PHOTO_RELAY_USES_SR_90_SOURCE

Published:2009/7/19 21:27:00 Author:Jessie | From:SeekIC

Interruption of high-energy beam from strontium-90 radioactive source changes resistance of cadmium sulphide photocell. Transistor amplifier converts variation into signal that actuates relay or other control element Source-detector separation must be less than 4 inches. Maximum counting rate is five pieces per second.-P. Weisman and S, L. Ruby, Solid-State Photocell Sees Through Haze, Electronics, 31:25, p 62-63.



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