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With the use of appropriate engineering controls, work practices and personal protective equipment for activities with exposure potential, actual workplace exposures are controlled below the occupational exposure limits (2 10 ppm).
However, all other reported occupational measurements were below the occupational BE.
Previous studies [ 52- 54], also found that benzene, toluene, ethylbenzene, xylenes (BTEXS) and styrene were below the occupational exposure threshold guidelines in photocopier centers.
These values are consistent with the concentrations observed in farm applicators from the Alexander BH, et al. (2007) study and are also below the occupational BERfD presented in Table 1.
Again, the data suggest an overall margin of safety, with median or geometric mean levels in farmers involved in application of 2,4-D more than 25-fold below the occupational BE target value.
Similar(7)
For the purposes of the occupational study discussed below, several silicone configurations (single, lapel, and stacked) were used to evaluate changes, if any, with skin contact during these shorter exposure periods.
The typical radiation dose for an 18 F-labeled PET tracer study (including only low-dose CT) is approximately 5 mSv, which is considered equivalent to 1 2 years of life in a major city and is below the yearly occupational limits for nuclear medicine technicians and radiochemists.
The probing power was 42 μW, which is well below the safe occupational exposure level established by the American National Standards Institute (ANSI Z 136.1).
Inhaled concentrations of 2 5 ppm for 4 hr, well below the current occupational standard, cause detectable toxicity (West et al. 2001).
The geometric mean of the 94 personal monitoring results collected at Widnes between 1987 and 1993, although well below the UK occupational exposure limit of 0.08 mg/m (8 h TWA, respirable fraction), equates to a mean daily intake of 25.8 μg PQ ion (assuming 10 m of air breathed during a shift), and exposure levels were almost certainly higher during earlier years of production.
In the extract below it is clear that the occupational therapist (OT) changed her view about Mrs. MacVicar's (see Table 2) residence capacity and finally decided that she lacked it; a formal assessment, however, concluded that she had the requisite capacity.
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