Method of determining whether radioactive contaminants are insid

Details Method of determining whether radioactive contaminants are insid Method of determining whether radioactive contaminants are insid

1976-08-05

1977-06-21

Willis, Davis L.

Radiant energy

Calibration or standardization methods

250358R, G01D 1800, G01N 2300

Patent

active

040313875

ABSTRACT:
A measure is obtained of the relative quantities of radioactive material inside and outside a structure such as a pipe by obtaining two spectra of gamma radiation on a dummy structure of the same shape and composition. A first spectrum is obtained with a quantity of the radioactive element to be measured located inside the structure and a second spectrum is obtained with a quantity of the same contaminant located outside the structure. The two spectra are normalized to the same equivalent value in a portion of the spectrum that does not reflect the presence of gamma rays resulting from Compton scattering in the structure. Comparison of that portion of the spectra obtained where Compton scattering is a factor gives a measure of the relative amounts of contaminants inside and outside the structure on a spectrum obtained from a test structure. The invention may also be practiced by obtaining a plurality of spectra at varying known concentrations inside and outside the dummy structure.

REFERENCES:
patent: 3955086 (1976-05-01), Tsujii et al.

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