نتایج جستجو برای: exposure limit
تعداد نتایج: 491019 فیلتر نتایج به سال:
Methods: Among 346 collected samples, benzene was identified in all cases (100%) and epichlorohydrin in 156 samples (45%). A significant difference was found in the mean of exposure to benzene and epichlorohydrin in various workshops (Pvalue <0.05). Occupational exposure to benzene in machiner with 1.68 ppm and patrol officers with 0.018 ppm were the highest and lowest values, respectively...
Introduction: Assessment of occupational exposure to external radiation and the analysis of associated trends are imperative to observe changes that have taken place over time due to regulatory operations or technological advancements. Herein, we describe the occupational radiation exposure to workers employed in Nuclear Medicine (NM), Radiotherapy (RT), and Diagnostic Radiology (DR) department...
oroginal article tiller is a handy multi – a purpose tractor is used in agriculture. the noise emitted from tiller may be seriously affected auditory system users. the purpose of this study was to evaluate the exposure to noise in operators of this device. in this study 36cultivator tiller was examined. measurement of sound is based in iso 5131-1996 and iso 7216 standard and was conducted in in...
Noise-induced hearing loss (NIHL) is caused by cumulative occupational and non-occupational noise exposure. The National Institute for Occupational Safety Health (NIOSH) developed exposure recommendations (85 dBA 8-hour time-weighted average) in 1972. Fifty years later, the NIOSH recommended limit (REL) needs to be revised downwards. In its calculations, assumed that workers have quiet when not...
omplex mixtures of disinfection by-products are formed in drinking waters when chlorine is used as disinfectant, among which are found trihalomethanes. trihalomethanes are very stable in the natural environment and are moderately lipophilic. thus they accumulate in the human organism, which may be related to a greater risk of certain cancers.the objective of this study is to investigate the ass...
Abstract Background: Occupational exposure to styrene can lead to various psychological and somatic complaints including color vision disorder that can occur even in low concentrations. Color vision disease is an early clue for effect of styrene on human, which can be used as an appropriate screening method in workers exposed to styrene. Materials and Methods: Working in waxy foundry is a job...
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