目的:利用與人類皮膚非常相近之豬皮膚，發展最為精確可靠且具有量化功能的豬上皮微小集落鑑定技術，以提供皮膚放射線傷害之良好研究模式。材料與方法:平均體重約為30公斤之白色雄性Landrace豬隻於適應飼養環境2週以上,並同時於左則腹面利用刺青方法劃出4x4公分範圍。於每一照野間膈5公分情況下，先行給予吸入麻醉並分別照射22.5，25.0及27.5 Gy之3 MeV電子射線劑量。照射後第14天起利用色差計(chromometer)測定紅斑反應程度並於△E值達到高峰之後一天進行皮膚取樣。切下中間2×2公分組織經過固定、水解、DNA染色，清除真皮層內所含結締組織後，將僅剩的上皮層予以封片,並利用光學顯微鏡計數每平方公分大於50個細胞的集落數目，並進一步求得劑量反應曲線及Do值。結果:利用色差計所測得之值可見，皮膚紅斑反應高峰期的△E值約介於5至8左右，且此高峰值僅存在約2天時間。多數豬隻△E值之高峰期約介於照射後18至21天之間。本技術獲取之集落影像呈現出細胞核染色深，排列規則而緊密，同時可見分裂細胞它與周圍細胞形成強烈對比,因此計讀容易。所獲取之活存曲線Do值為3.05±0.38 Gy。結論:大豬隻皮膚放射線研究之重要性人人皆知，但基於人力、物力、時時及精確性之考量,仍舊必須針對照射劑量準確度，最適合的取樣時機，皮膚組織之固定,染色及上皮組織之分離…等做最佳的組合,方能成為良好的傷害鑑定模式。研究結果證實本技術之優越性及實用性。相信對於皮膚早、晚期放射線傷害之研究必將引起廣泛的注意或應用。

　　　　　Purpose: To develop an accurate and quantitative measurement technique of the pigepidermal microcolonies as an ideal model system for radiation research on the skin.Materials and Methods: White male pigs weighing about 30 kg were kept in a separate cage indoorsand quarantined for at least 2 weeks before irradiation. All animals were tattooed on the left flankwith Indian ink at size of 4×4 cm and a gap of 5 cm between the fields. Prior to irradiation theanimals were anaesthetized with a gas mixture. Radiation dose was given at 22.5, 25.0 and 27.5 Gyusing 3 MeV electrons. At 14 days after irradiation, a chromometer was used to determined thedegree of erythema, the skin samples were taken on the next day after erythema reached themaximum. Only 2×2 cm skin samples were cutted, fixed. hydrolysed, stained, connective tissuesremoved, epidermal sheets prepared and mounted for final colony counting under the microscope.Furthermore, a dose-response curve and D0 value were obtained.Results: The maximum △F value were between 5 to 8, this peak value only lasts for about 2 days.Normally the maximum △F value appeared between days 18 to 21. The pattern of the presentepidermal microcolonies appears to have dark nuclear stain, regular and compact cellulararrangement with few mitotic cells, which forms strong contrast to the surrounding cells. The D0value deduced from the surviving curve was 3.05±0.38 Gy.Conclusions: The importance of pig skin in radiation research is known for many years by manyexperts. However, the development of an optimal assay system has to rely on the best combinationof the accuracy of radiation dose delivery, optimal sampling time, skin fixation, staining andepidermal sheet separation etc. The present results proved it's superiority and applicability in termsof the assay technique. We believe that this technique will draw much attention to the people whostudy early and late radiation injury on the skin.