紫外线灯管辐照强度监测方法及使用寿命的临床研究

摘要

Objective To explore the basis on ultraviolet lamp life and bulbs replacement and to ensure ultraviolet lamp irradiation monitoring accuracy. Methods The mobile UV intensity monitoring counters were used to monitor the ultraviolet lamp of 40 W and 20 W as test Ⅰ and test Ⅱ group, and the vertical monitoring data of vertical monitoring and on-the-spot bio-safety cabinet were used as control Ⅰ and control Ⅱ group. The two fluorescent UV irradiation monitoring methods were compared. The total use time of ultraviolet ray tube was more than 1 ,000 hours was defined as test Ⅲ group, less than 1 000 hours was defined as control Ⅲ group.Under standard condition, and ultraviolet intensity in the chest, record the monitor each time and the accumulative used fluorescent intensity and rate irradiation. The same room where all ultraviolet lamp are more than 1 000 hours without changing was recorded as test Ⅳ group, less than 1000 hours without changing was recorded as control Ⅳ group, The two groups were used with ultraviolet disinfection, bacterial colonies were recorded and disinfection effect was compared between the groups. Results Compared with three control groups, UV intensity in three testing groups were significantly higher (P ＜0. 05), but not the tube qualified rate (P ＞0.05). The average rate of bacteria kill in test group Ⅳ after the ultraviolet disinfection was 86.4% and the control group Ⅳ was 85.7%, the difference was not statistically significant (P ＞ 0. 05). Conclusions It was accurate and practical to use UV intensity monitoring counters. Total time more than 1 000 hours cannot used as judging basis for bulbs replacement. We should monitor ultraviolet radiation intensity of tube periodically and replace the unqualified bulbs.%目的 探讨紫外线灯管的使用寿命及更换灯管依据,以保证紫外线灯管辐照强度监测的准确性.方法 采用移动式紫外线强度监测柜对40 W和20 W的紫外线灯管进行辐照强度监测作为实验组Ⅰ和实验组Ⅱ,采用实地拉杆式垂直监测和生物安全柜内垂直监测的数据作为对照组Ⅰ和对照组Ⅱ,比较两种监测方法紫外线灯管辐照强度变化;将正在使用中的紫外线灯管,累计使用时间＞1 000 h的设为实验组Ⅲ,累计使用时间＜1 000 h的设为对照组Ⅲ,在标准状态下并在紫外线强度监测柜中检测,分别记录每只灯管的累计使用时间及辐照强度和合格率;选取同一房间的所有紫外线灯管都＞1 000 h且无更换记录的作为实验组Ⅳ,＜1 000 h且无更换记录的房间为对照组Ⅳ,进行紫外线消毒前后空气采样,分别记录检测的细菌菌落总数,观察两组灯管紫外线消毒效果.结果 实验组Ⅰ、Ⅱ、Ⅲ组辐照强度与对照组Ⅰ、Ⅱ、Ⅲ组比较差异均有统计学意义(P＜0.05);两组灯管合格率比较,差异无统计学意义(P＞0.05);实验组Ⅳ紫外线消毒后细菌平均杀灭率为86.4%,对照组Ⅳ的平均杀灭率为85.7%,两组比较差异无统计学意义(P＞0.05).结论 使用紫外线强度监测柜监测紫外线辐照强度准确、实用.不能将累计使用时间＞1 000 h作为判断紫外线灯管的使用寿命而更换灯管的依据,应定期监测紫外线灯管的辐照强度,不合格者作为更换灯管的依据.