Microdosimetry of Alpha-irradiated Lung

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Abstract
Measurements were made on the fractions of tissue affected and distributions of energy deposited when rat and human lung are irradiated by .alpha. particles. Thin sections of alveolar tissue were examined in an image analyzer and an imaginary 239PuO2 particle was placed in an alveolar sac. The hypothetical .alpha. particles were followed to the ends of their tracks so the effects of the material''s real structure could be examined in detail. A fiar comparison exists with results previously obtained with hamster lung. In addition, the measurements actually made with human lung correlate well with predictions based on the rat lung measurements. The approximation of a uniform, structureless lung is a poor one.

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