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专利名称：Radiation source shielding and collimating
device
发明人：Roger E. Garrett申请号：US05/727682申请日：19760929公开号：US04069423A公开日：19780117
摘要：Especially for use in agricultural machines such as lettuce harvesters having amaturity tester thereon, there is provided a radiation source such as Americium 241sealed in a capsule at atmospheric pressure. The capsule is disposed in a plungermovable in an evacuated chamber between a first position in alignment with a passagehaving a window permeable by radiation to the outside and a second position in which thecapsule is out of alignment with the passage. A pressure responsive switch monitors thepressure in the chamber and affords an alarm if the chamber pressure rises.
申请人：THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
代理机构：Lothrop & West
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