Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1976-04-12
1978-01-03
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
G01N 2300
Patent
active
040668983
ABSTRACT:
An apparatus and method based on X-ray transmission is disclosed for determining the thickness, or equivalently, the weight per unit area, of a substance containing atoms of a non-radioactive element of atomic number of 11 or greater applied to a fabric, such as a calcium- and/or aluminum-containing latex coating on a carpet. The apparatus employs a source of radiation which emits a single predominant X-ray within the range of 12-19 Kev, such as zirconium which fluoresces at 16 Kev when bombarded with 60 Kev radiation from americium-241; a detector sensitive to the radiation emitted and having resolution at least as sharp as about 20 percent, such as a Kr/CO.sub.2 proportional counter; and a suitable electronic circuit to convert the charge pulse output of the detector to a readout signal related to the amount of the substance on the fabric.
REFERENCES:
patent: 3270200 (1966-08-01), Rhodes
patent: 3938955 (1976-02-01), Maggiolo
"An X-ray Absorption Technique for Measurement of Coat Weight on Paper," Murray et al., Advan. X-ray Anal., 1961, pp. 309-318.
Kamp Arthur J.
Mischler Philip G.
Halldorson Burke M.
The Dow Chemical Company
Willis Davis L.
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