GB688672A - Luminescent detectors of nuclear radiation - Google Patents

Abstract

688,672. Luminescent materials; photo-cells. TESLA, NARODNI PODNIK, KUHN, A., and KMENT, V. May 2, 1951 [May 13, 1950], No. 10272/51. Class 39(i) [Also in Group XL(b)] Radio-activity is detected by means of a liquid which fluoresces under the radio-activity the secondary radiation from the liquid being detected by either a photo-cell or a Geiger counter sensitive to visible or ultra-violet light. In the example shown in Fig: 3 the cell 5 is situated in a recess in a globe 2 reflecting on its outside or inside surfaces and filled with a liquid which under the influence of radio-activity emits ultra-violet radiation. This radiation after reflection from the coating of the globe is converted into radiation of a longer wave-length by a cube 13, the cathode of the photo-tube receiving light through an uncoated part of the recess wall. In the embodiment of Fig. 2 (not shown) the cube is omitted while in that of Fig. 1 (also not shown) the reflecting coating is omitted from the cell recess and a Geiger tube is situated in the recess. In the embodiment of Fig. 4 for determining alpha radiation the radioactive substance 8 is placed in a tube 9 radiation passing through a wire disc 10 into the fluorescent liquid 1. The fluorescence is then reflected from a parabolic reflector and concentrated by a lens 6 on to the cathode of a cell 5. In detecting neutron radiation the reflector is coated with a substance such as cadmium or indium which emits secondary Alpha, Beta or Gamma radiation. The Specification mentions four distinct types of fluorescing liquids (1) Luminescent liquids emitting ultra violet rays (2) Solutions of luminescent substances in solvents having no luminescence e.g. UO 2 (NO 3 ) 2 in water or naphthalene in ether. (3) Solutions of luminescent materials in luminescent liquids emitting radiation of different wavelength from the solids e.g. stylbene in benzene (4) Solutions of luminescent material in liquids emitting radiation of the same wavelength as the solids e.g. naphthalene in benzene.