Radiant energy – Invisible radiant energy responsive electric signalling – Neutron responsive means
Patent
1996-09-20
1998-03-31
Porta, David P.
Radiant energy
Invisible radiant energy responsive electric signalling
Neutron responsive means
2523014R, G01T 306
Patent
active
057341664
ABSTRACT:
An apparatus for detecting neutrons includes a cerium activated scintillation crystal containing .sup.10 B, with the scintillation crystal emitting light in response to .alpha. particles emitted from the .sup.10 B(n,.alpha.)Li* reaction. The apparatus also includes a gamma scintillator positioned adjacent the crystal and which generates light in response to gamma rays emitted from the decay of Li*. The apparatus further includes a first and a second light-to-electronic signal converter each positioned to respectively receive light from the crystal and the gamma scintillator, and each respectively outputting first and second electronic signals representative of .alpha. particles from the .sup.10 B(n,.alpha.)Li* reaction and gamma rays from the .sup.10 B(n,.alpha.)Li* reaction. The apparatus includes a coincidence circuit connected to receive the first and second signals and which generates a coincidence signal when the first and second signals coincide. The apparatus also includes a data analyzer for receiving an additional signal from at least one of the first and second converters, and for operating in response to the coincidence signal.
REFERENCES:
Abdullaev et al., "Crystal structure of the double lithium ytterbium orthoborate Li.sub.6 Yb(BO.sub.3).sub.3 ", Sov. Phys. Crystallogr., vol. 22, No. 2, pp. 220-222, Mar.-Apr. 1977.
Abdullaev et al., "Synthesis and Structural Study of Crystals of the Double Orthoborate of Lithium and Holmium", Russian Journal of Inorganic Chemistry, 22, (12), 1977.
Mascetti et al., "Concentration Quenching of the ND.sup.3+ Emission in Alkali Rare Earth Borates", Journal of Solid State Chemistry 50, pp. 204-212, 1983.
Garapon et al., "Energy Transfer in Li.sub.6 GD(BO.sub.3).sub.3 ", Journal of Luminescence 34, pp. 211-222, 1985.
Kiliaan et al., "A study of the Sensitizer in the Luminescent Systems (Y,Gd).sub.2 O.sub.2 SO.sub.4 :Bi,Tb and Li.sub.6 (Y,Gd)(Bo.sub.3).sub.3 :S,Tb (S-C.sup.3+, Pr.sup.3+ or Bi.sup.3+)", Materials Chemistry and Physics, 18, pp. 155-170, 1987.
Hanig Richard
Mission Support Incorporated
Porta David P.
LandOfFree
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