紫外线灯照射强度与累计使用时间的相关性研究

目的 观察研究紫外线灯照射强度与累计使用时间的相关性.方法 随机抽取全院正在使用中的紫外线灯管136支,在标准状态下测量,分别记录每只灯管的累计使用时间及强度,将累计使用时间及照射强度进行相关性分析.并将累计使用时间大于1 000 h的61只灯管设为试验组,然后随机选取累计使用时间小于1 000 h的75只灯管为对照组.结果 紫外线灯的照射强度与累计照射时间的秩相关系数r=-0.135 6,tr=-1.584 1,P＞0.05,故紫外线灯的照射强度与累计照射时间的秩相关系数无统计学意义.试验组与对照组的平均累计时间差异有统计学意义(t=17.814,P＜0.001),试验组的累计使用时间明显长于对照组,两组资料具有可比性.两组平均照射强度及合格率比较差异无统计学意义(t=1.263,P＞0.05;x2=0.19,P＞0.05),不能说明两组灯管照射强度及合格率有差别.结论 紫外线灯的照射强度与累计照射时间之间无相关关系.紫外线灯管累计使用时间,不应作为更换灯管的依据.标准状态下测量强度作为判断合格的标准,现场测量强度作为筛查,并作为决定照射时间长短的依据.

The correlation analysis of illuminate intensity and accumulative used time of ultraviolet lamp

Objective To observe the correlation between illuminate intensity and accumulative used time of ultraviolet lamp. Methods UV lamp 136 were chosen in standard measurement, accumulated use time, fluorescent intensity were recorded and the correlationship was analyzed. And the use time more than 1 000 hours was experimental group and the use time less than 1 000 hours was control group. Results Illuminate intensity of ultraviolet lamp and cumulative exposure time of rank was correlation coefficient r = -0. 135 6, tr =-1. 584 1, P ＞0. 05, illuminate intensity of ultraviolet lamp and cumulative exposure time of rank correlation coefficient was not statistically significant. The average of total control group and the time difference were extremely remarkable significance (t = 17. 814, P ＜0. 001 ), the total time trial was significantly longer than that of control group, two groups of material comparable. Two groups of average illuminate intensity and different rate were not statistically significant ( t = 1. 263, P ＞ 0. 05 ); and (x2 = 0. 19, P ＞ 0. 05), these cannot show two groups tube illuminate intensity and rate, there were differences. Conclusions Illuminate intensity of ultraviolet lamp and cumulative exposure time were no correlation. The accumulated use time of uv lamp, should not be the basis as the replacement bulbs. Under the state standard of measuring standard for judging the strength of the field measurement, qualified as a screening, and as the intensity of the length of time according to illuminate the decision.