氩等离子体紫外光A和B辐射属性计算

Calculation of radiative properties for argon plasma in ultraviolet A and B

关键词:  紫外光  辐射  焊接电弧  皮肤癌  净辐射系数

Key words:  ultraviolet  radiation  welding arcs  skin cancer  net emission coefficient

摘要:

焊接等离子体释放的紫外光A （315~400 nm）和紫外光B （280~315 nm）是皮肤癌的重要诱因.基于净辐射系数的概念，考虑了连续谱（复合辐射和轫致辐射）和线谱等辐射机制，计算了氩等离子在常压、5 000~25 000 K内的紫外光A，B的辐射属性.结果表明，随着等离子体半径R_p增加，全谱辐射发生强烈的自吸收效应，而紫外光A，B基本无自吸收；当R_p=1 mm时，它们在总谱辐射（35~4 500 nm）的最大的占比分别为6.0%，1.9%，在非真空紫外辐射（200~4 500 nm）的最大的占比为36.3%和5%.为钨极氩弧的紫外光危害性研究提供了理论依据.

Abstract:

Exposure to ultraviolet A (315~400 nm) and B (280~315 nm) from welding arcs is an important risk factor for the development of skin cancer. Based on the concept of net emission coefficient, the radiative properties within the ultraviolet A and B ranges are calculated for argon plasma with a radius of R_p in the temperatures 5 000~25 000 K at atmospheric pressure. The various radiative mechanisms, including continuum (recombination and bremsstrahlung) and line radiation, are considered. It is concluded that although the self-absorption effect is prominent for the entire spectrum, it is very weak for the ultraviolet A and B. When R_p=1 mm, the ultraviolet A and B radiations account for at most of 6.0% and 1.9%, respectively. To the entire spectrum (35~4 500 nm) radiation, and account for at most of 36.5% and 5.0% to non-vacuum-ultraviolet (200~4 500 nm) radiation. This study establishes a theoretical basis for the study of the ultraviolet radiation posed by TIG arcs.