Radiation source shielding and collimating device
AssigneeThe Regents of the University of California
InventorRoger E. Garrett
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Abstract
Especially for use in agricultural machines such as lettuce harvesters having a maturity tester thereon, there is provided a radiation source such as Americium 241 sealed in a capsule at atmospheric pressure. The capsule is disposed in a plunger movable in an evacuated chamber between a first position in alignment with a passage having a window permeable by radiation to the outside and a second position in which the capsule is out of alignment with the passage. A pressure responsive switch monitors the pressure in the chamber and affords an alarm if the chamber pressure rises.
Claims7
A radiation source shielding and collimating device comprising a body having a chamber therein, means defining a radiation passage from said chamber to the exterior of said body, a source of radiation at atmospheric pressure and in said chamber, means for subjecting said chamber to a subatmospheric pressure, and an indicator responsive to the pressure in said chamber.
Dependencies are inferred from the claim text.