Chai Dong-liang, Lü Jing-qiao, Zeng Lin, Su You-gong, Lei Zhuo, Zhao Yi-ming
Center for Clinical Epidemiological Research, Peking University Third Hospital, Beijing 100083, China.
Zhonghua Yu Fang Yi Xue Za Zhi. 2006 Mar;40(2):93-6.
To measure and evaluate the personal noise exposure of cold rolling mill workers by using noise dosimeter.
According to job category and work type, all workers were divided into 11 groups. 3 to 5 day shift (8:00 to 16:00) workers from each group were selected as subjects for personal noise exposure measurement. SH-126 dosimeters were worn by each subject and collect noise data by a phone fix at collar. All subjects were asked to take notes about their working activities when they were wearing SH-126 dosimeters. Each worker's L(A)(eq) of 8 hours, geometric mean and range of each group were computed.
There were many noise sources in the workshop. Recorded data showed that noise exposure of cold rolling mill was unstable. The varieties of personal noise levels were quite large. Among 53 workers, the highest noise exposure level was 100.0 dB (A), the lowest was 81.2 dB (A); the highest work type was of the foreside welders [94.20 dB (A)], and the lowest was of the straight-cutters [89.02 dB (A)]; quality checkers had the biggest rang [16.3 dB (A)], and primary rolling workers had the lest [2.3 dB (A)].
Noise exposure of all the 11 groups were more than 85 dB (A). Noise protection of these workers should be improved. It suggested that measuring personal noise exposure individually with dosimeters might obtain the noise exposure level more integrally in the complicated environment.
使用噪声剂量计测量和评估冷轧厂工人的个人噪声暴露情况。
根据工作类别和工作类型，将所有工人分为11组。从每组中选取3至5名日班（8:00至16:00）工人作为个人噪声暴露测量的对象。每位受试者佩戴SH - 126剂量计，并通过固定在衣领处的传声器收集噪声数据。要求所有受试者在佩戴SH - 126剂量计时记录其工作活动。计算每位工人8小时的等效连续A声级（L(A)(eq)）、每组的几何平均值和范围。
车间内有许多噪声源。记录的数据表明，冷轧厂的噪声暴露不稳定。个人噪声水平的差异相当大。在53名工人中，最高噪声暴露水平为100.0 dB(A)，最低为81.2 dB(A)；最高的工作类型是前端焊工[94.20 dB(A)]，最低的是直剪工[89.02 dB(A)]；质量检验员的噪声水平范围最大[16.3 dB(A)]，初轧工人的最小[2.3 dB(A)]。
所有11组工人的噪声暴露均超过85 dB(A)。应加强这些工人的噪声防护。建议在复杂环境中使用剂量计单独测量个人噪声暴露，可能会更全面地获得噪声暴露水平。
