Histological studies after experimental grid irradiation. IV. Findings in the skin

In the skin of the rat with longer focus-to-grid distance and wider slot openings the grid pattern corresponding to the inhomogeneous dose distribution may be demonstrated by histological means; after slot irradiation the damaged skin portion corresponding to the slot may be recognised. The shorter length of this skin portion compared with the width of the slot as well as the differences after grid irradiation of the average length of the severely damaged and relatively intact portions is in accordance with the authors conception, justified already by previous experiments, namely that the tissue parts covered by the bars of the grid exert a protective influence on the adjacent directly irradiated tissues.