Method and apparatus for monitoring the manufacture of a two-com

Details Method and apparatus for monitoring the manufacture of a two-com Method and apparatus for monitoring the manufacture of a two-com

1983-11-01

1986-03-04

Smith, Alfred E.

Radiant energy

Inspection of solids or liquids by charged particles

Including a radioactive source

2503581, 2505051, 378 53, G01N 2316

Patent

active

045741948

ABSTRACT:
A beta radiation sensor and an X-ray radiation sensor are used to monitor the specific weights of both components of a two-component web, in particular, a web of magnetic recording material, by using the beta radiation sensor to measure the combined specific weight of the material. The measurement by the X-ray sensor permits such combined specific weight to be apportioned between the two components of the web. Cross talk between the two sensors arising from bremstrahlung produced by the beta radiation sensor is suppressed by softening the beta radiation beam with films of polyester, by shielding the housing in which the detectors of the two sensors are disposed with a sheet of phenolic, and by stopping down the aperture through the sheet of phenolic through which X-ray radiation enters the detector housing.

REFERENCES:
patent: 3082323 (1963-03-01), Chope et al.
patent: 3087061 (1963-04-01), Dukes et al.
patent: 3452192 (1969-06-01), Hanken
patent: 3500446 (1970-03-01), Hasegawa et al.
patent: 3665199 (1972-05-01), Cahill et al.
patent: 3889121 (1975-06-01), Bossen
patent: 4182954 (1980-01-01), Giles
Mladjenovic, Radioisotope and Radiation Physics, 1973, Academic Press, N.Y., sections 6.8.2 through 6.10, pp. 153-159.
Tsoulfanidis, "Measurement and Detection of Radiation", McGraw-Hill Book Co., N.Y., 1983, p. 117.

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