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Results and Discussion: The skin irradiated by β-rays was shown to exhibit more severe skin injury than that irradiated by γ-rays at 1-3 weeks post-exposure; however, while the skin lesions caused by β-rays recovered after 8 weeks, the γ-irradiated skin lesions were not repaired after this time. The observed histopathological changes corresponded with gross appearance scores. Seven days post-irradiation, apoptotic cells in the basal layer were detected more frequently in β-irradiated skin than in γ-irradiated skin. The basal cell density and skin thickness gradually decreased until 4 weeks after γand βirradiation. In β-irradiated skin lesions, and the density and thickness increased sharply back to control levels by 6-9 weeks. However, this was not the case in γ-irradiated skin lesions. In γ-irradiated skin, cyclooxygenase-2 (COX-2) was shown to be expressed in the epidermis, endothelial cells of vessels, and fibroblasts, while β-irradiated lesions exhibited COX-2 expression that was mostly limited to the epidermis.

Comparison of Skin Injury Induced by β- and γ-irradiation in the Minipig Model