Well-type scintillation assembly

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 performa...

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Bibliographic Details
Main Authors MATARAZA; GEORGE A, FARUKHI; MOHAMMAD R, WIMER; OLEY D
Format Patent
LanguageEnglish
Published 03.01.1978
Subjects
MEASUREMENT OF NUCLEAR OR X-RADIATION
MEASURING
PHYSICS
TESTING
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Summary: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 129I53.
Bibliography:Application Number: US19760672206