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随着电视机的出现,由CRT(显象管)所产生的放射线也就引起了人们的注意。ICRP 和NCRP 都曾建议,距离CRT 荧光屏5cm 处的照射剂量率应在0.5mR/h 以下。另一方面,随着计算机普及,人们也在讨论由VDT(视觉显示终端)所造成的危害。本文介绍对彩色电视机和计算机的CRT 所产生的放射线的测量结果。方法和结果实验1:用GM 计数管测量CRT 荧光屏前的计数CRT 荧光屏与GM 计数管的距离为15mm,其间放置各种厚度的铝箔吸收板。测量结果与CRT 是否接高压无关。在没有铝箔的情况下,本底计算率增加60～70%。
With the advent of television sets, the radiation generated by CRTs has drawn the attention. Both ICRP and NCRP have suggested that the radiation dose rate at a distance of 5 cm from the CRT screen should be less than 0.5 mR / h. On the other hand, with the popularization of computers, people are also discussing the harm caused by VDT (Visual Display Terminal). This article describes the measurements of radiation produced by CRTs on color television sets and computers. Method and Results Experiment 1: Measurement of the Counting of the CRT Screen with the GM Counter Tube The distance between the CRT screen and the GM counter tube was 15 mm, during which various thickness of the aluminum foil absorber plates were placed. Measurement results and whether the high pressure CRT has nothing to do. In the absence of aluminum foil, the background calculation rate increased by 60 to 70%.