Long wave ultraviolet (also known as black light or UV-A) emissions typically range from 320nm to 400nm in the electromagnetic spectrum. Although long wave UV emissions are known to be relatively safe compared to other ultraviolet emissions, it is necessary for all operators and supervisors to observe certain safety precautions when working with high-intensity UV-A sources.

通常长波紫外线（大家熟知的黑光灯或UVA）的电磁波波长范围是指320nm-400nm，虽然大家都认为长波紫外线是安全的，但是，操作紫外线光源所进行的安全防护是必要的。

Personnel using high-intensity long wave UV lamps should avoid looking directly at the sources, as this can cause fluorescence of the eyeball.This would result in lowering the ability of the user to detect the fluorescent response. The filter used with UV-A sources, either as an integral par t of the bulb/tube or as a separate component, should always be maintained in good condition and free from cracks, as radiation at wavelengths below 320nm can be very dangerous.

操作高强度长波紫外线灯应避免眼睛直视光源。如果这样长时间去观察荧光效果会导致观察者视力下降。紫外线灯的滤色片应保持在完好无损没有裂缝，如果滤色片破裂，会有低于320nm的紫外线照射出来，那样是非常危险的。

It is a good practice not to shine high-intensity UV-A sources onto exposed skin, especially when the user is taking certain medications which produce increased photosensitivity to UV. Such exposure can cause skin irri t a t i o n . It is recommended that users wear long-sleeve, n o n f l u o r e s c e n t clothing and nonphotochromic goggles when performing inspection.The goggles should possess UV-blocking capabilities; the transmission in the long wave UV region should be better than 10¯4.

不要将皮肤裸露在高强度紫外线灯下，必需穿戴非荧光性的工作服，确保皮肤没有裸露在紫外线灯下。当操作者服用某些药物时会增加紫外线的光敏性，个别人员会有过敏反应。操作者穿戴好防工作服、紫外线防护眼镜。

 The threshold limit values published by the American Conference of Governmental Industrial Hygienists (ACGIH) for occupational exposure to UV-A radiation states that the total irradiance incident upon the unprotected eyes should not exceed 1mW/cm2 for periods greater than 1,000 seconds (approximately 16 minutes).  For exposure times less than 1,000 seconds, the total UV-A dosage should not exceed 1Joule/cm2 (Joule = watts x seconds). Exposure of the unprotected eyes or skin should not exceed the values below.

美国工业卫生专家协会(ACGIH)公布的没有佩戴防护眼镜的操作者辐照数据为紫外线强度为1mW/cm2不应大于1000秒的时间（约16分钟）。不到1000秒的照射时间，合计紫外线UVA的能量不超过1Joule/cm2(Joule = watts x seconds)。未受保护的眼睛或皮肤的接触不应超过下列值。\