Attenuation factors for certain tissues when the body is irradiated omnidirectionally

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Abstract
Experimental mean attentuation values are reported for certain human tissues in an anthropomorphic phantom, irradiated omnidirectionally with .gamma. rays from 24Na, 226Ra, 131I and 133Xe. The data relate the mean absorbed dose to the whole body, bone marrow, gonads and skin to the absorbed dose in air and the exposure in air. Radiation degradation by scatter and photoelectron enhancement effect are corrected. For natural background .gamma. rays a mean attenuation factor of 0.7 is recommended for bone marrow. The corresponding rad/R factor is 0.67. The effective mean depth of bone marrow estimated for omnidirectional irradiation is 5.0- 5.5 cm.
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