Zero displacement ionization chamber

Details Zero displacement ionization chamber Zero displacement ionization chamber

1980-04-29

1982-12-07

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

2502521, H01J 3928

Patent

active

043629407

ABSTRACT:
The present invention provides a zero displacement ionization chamber for use in calibrating radiation units. The ionization chamber includes a thimble chamber having first and second electrodes with predetermined thickness and length separated from one another by a pre-defined air gap. The material density and air gap density are balanced by weighting the normal path lengths of radiation rays through the thimble chamber, thereby affecting the thimble chamber having an overall density substantially the same as water thus yielding a zero displacement when placed in water. The first and second electrodes are further electrically connected to a power source for creating an ionization effect when receiving radiation rays in the air gap so that a signal indicative of the radiation exposure may be detected by an electrical connection to one of the electrodes.

REFERENCES:
patent: 2536991 (1951-01-01), Wollan et al.
Sauret-Cistac et al., "A High-Sensitivity Balloon-Borne Tissue Equivalent Proportional Counter", Nuc. Instr. & Methods, 129(5), Nov. 15, 1975, pp. 607-612.
Stark et al., "Design and Use of Zero Displacement Tissue Equivalent and Air Equivalent Ionization Chambers", Med. Phys. 6(4), Jul./Aug. 1979, p. 332.
Stark, "Design and Use of Zero-Replacement Tissue-Equivalent, and Air Equivalent Ionization Chambers", Thesis, U. of Texas, Houston, Oct. 1979.

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