fa بررسی آلودگی صوتی در منطقه نفتی لاوان و تعیین اثر محصور سازی منابع مولد صدا بر کاهش تراز فشار صدا ارزیابی و مدیریت ریسک Assessment and risk management پژوهشي Research <p align="right">چکیده</p> <p>  <strong>Background and aims</strong> </p><p>  <strong></strong>Overexposure to industrial noise pollution induce hearing loss workers. Occupational hearing loss may cause interference whit oral communication, so it may  increase the risk of occupational accidents in workplace as well as affects whit social activities.  This study was conducted on Lavan Island, are of oil extracting regions in the south of Iran. The  object of this study was to evaluate noise pollution and determining the effect of noise enclosure  on noise abatement. </p><p>  <strong>Methods</strong> </p><p>  <strong></strong>The noise sources were recognized and noise pressure level was measured by CEL- 440. Noise dose of the exposed workers in high level noise area were measured by CEL 272. </p><p>  <strong>Results</strong> </p><p>  <strong></strong>Major noise sources were gas turbines, diesel generators, compressors, fans and gas containing pips, noise contour map revealers that noise level were higher than the recommended national exposure limit. The results of workers noise dose show that their noise exposure were  higher than the recommended value, (p<0.001). Finally, by using the results of noise frequency  analysis of different noise sources, the noise pressure level of each sources was determined in   terms of enclosing them. </p><p>  <strong>Conclusion</strong> </p><p>  <strong></strong>By enclosing the noise sources, noise pressure levels can be lowered douse to  acceptable levels but limitation of applying enclosure should be regarded. </p><p>  </p> آلودگی صوتی،استخراج نفت،جزیره لاوان،محصور سازی Noise pollution, oil extraction, Lavan Island, enclosure 49 56 http://ioh.iums.ac.ir/browse.php?a_code=A-10-3-7&slc_lang=fa&sid=1 P. Nassiri پروین نصیری 1360031947532846003026 1360031947532846003026 Yes Tehran University of Medical M. Zare مهدی زارع 1360031947532846003027 1360031947532846003027 No Tehran University of Medical Sciences. F. Golbabaei فریده گابابایی 1360031947532846003028 1360031947532846003028 No Tehran University of Medical Sciences, Tehran, Iran.