Diethone의 피부에 대한 방사선 보호작용을 평가하기 위하여 Wistar계 랫드에 단일 X-선(20, 30, 40 Gy) 조사 후 시간경과와 선량변화에 따른 급성 피부반응을 연구하였다. 40Gy 선량에서 Diethone군의 피부반응기간은 24.7일로 대조군(29.8일)과 바셀린(29.2일) 투여군에 비하여 약$17\%$의 피부반응 기간이 뚜렷이 감소되었다. 피부반응이 최고도에 달한 10일 동안의 평균치는 Diethone군(2.43)이 대조군(2.91)과 바셀린(2.81)군에 비하여 현저히 감소되었다. 피부반응 Score 2.5에서 구한 등가효과 선량의 반응감소 계수(DRF)는 1.41로 피부보호효과가 있었다. 본 실험 결과로 보아 방사선 피부보호제를 국소적으로 도포함으로써 일반적인 치료선량보다 많은 방사선량을 거대하고 방사선내성이 있는 종양에 조사함으로로써 치료효과를 향상시킬 수 있을 것으로 기대한다.
Investigations were carried out into the time-and dose-related changes in acute skin reaction following graded single dose (20,30 and 40 Gy) of x-ray irradiation in Wistar rats, in order to evaluate the radioprotective effect of Diethon on skin. For the duration of skin response over 1. 5 score in dose of 40 Gy, the Diethone group of 24.7 days was significantly different (p<0.02) from that of control (29.8 days) and vaseline (29.2 days) groups, it was $17.1\%$ diminution of skin response period compared with that of control group. By the averaging daily scores for 10 days during peak skin reaction the mean scores were obtained. Mean score of Diethone group $(2.43pm0.22)$ was significantly different (p<0.01) from that of control $(2.91pm0.23)$ and vaseline $(2.81pm0.18)$ groups of 40Gy dose. By iso-effect dose obtained at level of 2.5 score the dose reduction factor (DRF) was 1.41 which reduced radiation dose of $41\%$ by radioprotective effect of Diethone. From this experimental data, it may be possible to give higer radiation dose to large and/or radioresistant tumor mass rather than conventional treatment doses for improving therapeutic ratio by using topical application of skin radioprotector.
