Well-type scintillation assembly

Details Well-type scintillation assembly Well-type scintillation assembly

1976-03-31

1978-01-03

Willis, Davis L.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

250361R, 250487, G01J 158

Patent

active

040669084

ABSTRACT:
A scintillation detector assembly is described which employs a scintillation phosphor such as a thallium activated sodium iodide crystal, wherein a blind hole is machined in the crystal to improve the efficiency of measuring the degradation rate of a radioactive material placed therein. The performance of the assembly is defined by the energy resolution of the radiation emanating from the radioactive source. This performance is improved by balancing the collection of light from areas of low and high light collection. This is achieved by suitably preparing the surfaces of the crystal and by controlling the reflectivity of these surfaces using controlled and fixed reflectivity material such as optical filters, cellulose ester-type fibrous paper and like materials. Improvements in resolution of 30 - 50% over prior art well assemblies have been measured for radioactive sources such as .sup.129 I.sub.53.

REFERENCES:
patent: 2855520 (1958-10-01), Stoddart et al.
patent: 3591807 (1971-07-01), Mays et al.

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