Estimation of organ depth by gamma ray spectral comparison

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Abstract
In order to measure the amount of radioactive tracker taken up by an organ in the human body, it is necessary to determine the depth of the organ in the body. A procedure is presented which is similar to the valley-to-peak method of Mohindra and McNeill (1965) but involves analysis of the entire pulse-height spectrum. Measurements are made on 131I with a water phantom and a single collimated detector in a fixed position. A set of calibration spectra are taken for a source at depths ranging from 2 to 15 cm in 1 cm increments. Then test spectra are taken for fixed times with sources placed at various depths. By comparing a test spectrum with the calibration spectra, it is possible to calculate the source depth. The method is checked for dependence of calculated depth on source thickness and on background concentration.

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