Other explanations include extended exposure to hazardous physical, chemical and psychological factors, and insufficient recovery due to short sleep duration [ 31].
Extending plasma exposure duration and decreasing substrate temperature within the ALD window both serve to improve the conformality of the deposited film, with coverage >95% achievable.
Furthermore, it can be argued that if there is no reduction in acute thyroidal iodide uptake, there will be no reduction in stored iodide, and extending the exposure duration is not likely to affect thyroid function.
Importantly, sunscreen is often used inadequately and may induce a false sense of safety in the sun or tanning bed, and it has been shown that people using sunscreen with high sun protection factor (SPF) do not burn less than those using lower SPF as sunscreen abuse may extend sun exposure duration thus allowing sun exposure behaviors that would not be possible otherwise.
Recently Schwartz [ 2] and Zeger et al [ 1] have succeeded in extending the exposure duration up to T = 60 days, measuring, in effect, the average relative risk ΔRRav corresponding to the average concentration Δcav of PM10 during the period T. They find that ΔRRav/Δcav increases with T at least up to 60 days, the longest for which their method could be used.
This dramatically slows the response and extends exposure time.
However, when the exposure concentration was reduced by half to 312 ppm and the exposure duration extended to 52 weeks, the incidence of lymphocytic lymphoma was reduced by 90%.
The morphological results show that exposure to cyclic white LED light may induce outer retinal damage within 9 days and may be responsible for further deterioration when the exposure duration is extended.
Future advances in this field are expected in the area of the exposure duration and/or frequency, with the aim to extend the methodology to explicitly account for less than chronic exposures and to chemicals with the potential to bioaccumulate.
Exposure duration and effective figure-ground contrast.
The test variables were the type and exposure duration.
