ATTENUATION OF MONOENERGETIC GAMMA RAYS IN TISSUES

¹ Fellow in Radiological Research of the James Picker Foundation recommended by the Committee on Radiology NAS-NRC.

Using gamma-emitting radioisotopes and a crystal spectrometer we measured linear attenuation coefficients for a variety of tissues at photon energies of 27, 60, 122, 279, and 662 kev. The fractional standard deviations of the observed values varied with tissue thickness, but were about 0.5 per cent in most of the cases. Specific gravities of the tissue samples were measured wherever feasible. Our results indicate that the attenuation coefficients of different parts of the same organ may vary by up to 1 per cent. For most of the tumors investigated, no significant differences were found between the attenuation coefficients of cancerous tissues and their normal parenchyma.

Some attenuation coefficients were measured for a few of the materials commonly used as phantom materials. The results are presented in Table IX.

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