VDT用滤光屏辐射防护性能的工效学评价

The Ergonomic Evaluation of Raidation Protection of VDT-filters

采用 TGS5 0 1型 GM管检测仪 ,以 983 6C 3 0 cm CRT显示器为对象 ,判明 7类 VDT用滤光屏分别可减弱 β射线辐射量的 2 3 %～ 88%。但根据对 3 8台 VDT的射线泄漏实况调查 ,各 CRT显示器前方 ,X射线 ,γ射线的剂量水平平均在检测仪灵敏度以下 ,仅部分检有微量β射线 ,且最近操作位的剂量当量最大值仅为 0 .0 2 68μSv/h,倘以作业者一年的最大暴露时间为 2 0 0 0 h计 ,其暴露剂量仍远远低于 ICRP及我国规定的限值。因此

By using the digital GM surveymeter(TGS 501 type) made in Japan,we carried a comparative evaluation on the efficacy of 7 kinds of VDT filters used to attenuate β-ray,the object was 12in CRT display unit of 9836C type. The results showed there was obvious radiation protection. It was attenuated 23%-88% respectively. The results in reality state investigation from 38 set 'VDT ray leak'observed x-ray, y-ray level in front CRT display unit was wholly under sensitivity of the detector.The β-ray emission from VDTs was equivalent to the dose rate of less than 0. 027uSv/h.Even if the maximum exposure time is supposed to be 2 000 hours a year,the exposure dose was still lower than the level of ICRP and the limit quality of our country.Therefore, the writer thought the users of VDT needn't to revise and purchase filters to prevent radiation.