High efficiency photoionization detector

Details High efficiency photoionization detector High efficiency photoionization detector

1981-05-12

1984-01-31

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250361R, G01T 118

Patent

active

044292287

ABSTRACT:
A high efficiency photoionization detector using tetraaminoethylenes in a gaseous state having a low ionization potential and a relative photoionization cross section which closely matches the emission spectrum of xenon gas. Imaging proportional counters are also disclosed using the novel photoionization detector of the invention. The compound of greatest interest is TMAE which comprises tetrakis(dimethylamino)ethylene which has a measured ionization potential of 5.36.+-.0.02 eV, and a vapor pressure of 0.35 torr at 20.degree. C.

REFERENCES:
Charpak et al., "The Photo-Ionization Proportional Scintillation Chamber," IEEE Trans. Nucl. Sci., NS-27, No. 1, pp. 212-215, Feb. 1980.
Ku et al., "Properties of an Imaging Gas Scintillation Proportional Counter," pp. 1-5, Columbia Astrophysics Laboratory.

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