Radiation shielding arrangement for coating thickness measuremen

Details Radiation shielding arrangement for coating thickness measuremen Radiation shielding arrangement for coating thickness measuremen

1981-09-22

1984-08-21

Smith, Alfred E.

Radiant energy

Inspection of solids or liquids by charged particles

Including a radioactive source

2503581, 2504981, 2505151, G01N 23203

Patent

active

044671989

ABSTRACT:
A shielding arrangement for a coating thickness device utilizing the radiation backscatter technique. An isotope housing is provided having an aperture through which radiation can pass. A removable cover shield is attached to the housing to cover the aperture when the device is not in use. Means are provided to remotely remove the cover shield from the housing and expose the aperture. A secondary shield carried by the device is provided to swing into and out of covering relationship to the aperture to block radiation passage through the aperture between measurements. The secondary shield is operatively connected with the operating handle of the device to coordinate movement of the secondary shield with the position of the isotope housing. A tertiary shield, which can be of transparent plastic material, is provided between the measuring zone of the device and the operator to provide additional shielding during the times the secondary shield is not in covering relationship with the aperture.

REFERENCES:
patent: 2790087 (1957-04-01), Williams
patent: 2932744 (1960-04-01), Lehman
patent: 3488495 (1970-01-01), Schneeman
patent: 3505520 (1970-04-01), Stewart et al.
patent: 3737661 (1973-06-01), Applegate

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