نتایج جستجو برای: exposure methods
تعداد نتایج: 2122752 فیلتر نتایج به سال:
introduction the purpose of this study was to evaluate personal shields in radiation departments of hospitals affiliated to mashhad university of medical sciences. materials and methods first, the information related to 109 personal shields was recorded and evaluated by imaging equipment. afterwards, the equivalent lead thickness (elt) of 62 personal shields was assessed, using dosimeter and st...
to study the relation between hypertension and noise exposure, after the noise monitoring is weaving and spinning workshops, a especially designed questionnaire was completed and measurement were made of blood pressure, height and weight of 1801 male and female workers employed in these workshops. the results indicated that the systolic and diastolic pressure had a direct relation with age and ...
lead poisoning is a historic universal disease. acute or chronic lead exposure may cause reversible or even permanent damages in human beings. environmental lead exposure is a global health concern in children. occupational lead poisoning is still a health issue, particularly in developing countries. during the last decades, new methods and medications have been advocated for the prevention and...
Nowadays, using rail vehicles like metro is necessary for transportation in megacities and metropolises. In this descriptive-analytical study, whole body vibration was evaluated by two methods including basic evaluation and the recommended dose of vibration proposed based on ISO 2631-1 standard. In the present study measurements were performed over 13000 seconds in usual daily working hours by ...
Background: Exposure to noise can induce hearing loss. Thus noise induced hearing loss is one of the main concerns in interventional study on health effect of noise exposure. We analyzed pre and post exposure audiometeries of volunteers in a clinical trial study that we conducted for effect of noise exposure on cardiovascular system. Methods: In a clinical trial study, 100 healthy, 20-40 aged, ...
In their review of approaches to studying the influence of environmental exposures on human fecundity, Tingen et al. (2004) compared several ways of assessing fecundity. Fecundity—the probability of pregnancy in couples having regular intercourse without contraception—can be assessed by applying appropriate statistical approaches to time-topregnancy (TTP) data. Tingen et al. (2004) provided a t...
objective: hexavalent chromium [cr (vi)] compounds are well-known environmental contaminants generated from industrial processes. several studies have reported the harmful effects of cr (vi) on different organs, however, little is known about neurotoxic effects of cr (vi). the aim of this study is to investigate the toxic effects of cr (vi) on pc12 cells. methods: pc12 cells were cultured foll...
background: secondhand smoke (shs) exposure has been reported to cause a number of adverse health effects. although studies have been conducted to identify the link between shs exposure and cognitive functioning of children, its relationship is still unclear. this study aimed to identify the association of prenatal and postnatal shs exposure with cognitive ability among adolescents. methods: a ...
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