紫外線暴露會造成皮膚紅腫的潛在影響，電弧電銲過程中發射涵蓋所有紫外光區域 (紫外線A，B，及C) 的強烈紫外線。本研究建立一完整的評估方法，監測由遮蔽金屬電弧焊接產生的紅斑紫外線強度。將電弧紫外線的原始輻射與生物紅斑有效參數 (Sλ) 相乘積，獲得生物紅斑有效劑量以進行人體皮膚之暴露評估，該光譜權衡公式及計算遵循國際光照協會所頒佈之指引。
紫外線指數可視為一種輻射劑量指標，計量方式由國際光照協會計量之紅斑有效輻射總積分值，再乘上0.04 m2 mW -1 (依定義每一紫外線指數等於25mWm-2)。電銲在距離50，100，200，及300公分計算後之紫外線指數值，分別為121，53，11，及6。本研究建立完整詳細的紅斑紫外線有效輻射的計量，及針對人體皮膚暴露劑量的評估模式，未來也將可以應用紫外線指數來研究環境太陽紫外線的模擬暴露影響評估。

Ultraviolet radiation (UVR) exposure is known to cause potential effects such as erythema in skin. Arc welding processing scatters bright light with high levels of UVR emission including full UV spectrum (UVA, UVB, and UVC). This study established a comprehensive approach to monitor erythemal UVR magnitude from Shield Metal Arc Welding (SMAW) processing. The irradiances from welding UVR are calculated with biological erythemal effective parameter (Sλ) for human skin exposure assessment. The spectral weighting function for UVR measurement and evaluation is followed by
the CIE (Commission Internationale de l'Eclairage, International Commission on Illumination) action spectrum.
The UV Index (UVI) is an irradiance scale computed by multiplying the CIE erythemal irradiance integral in mili-Watts per square meter by 0.04 m2 mW-1. The average UVI values at 50, 100, 200, and 300 cm from arc welding are 121, 53, 11, and 6, respectively. From this study, complete details of the erythemal UVR emission spectrum and exposure dose on human skin exposure assessment were established and could be further evaluated by the environmental solar simulation of the UVI exposure.