Sample Distributions of Exposure Assumptions in Human Populations

Ranges for all of these parameters are somewhat defined for humans in the many surveys conducted by the government or private companies. The general distributions for several of these parameters are shown on figure 10.4 and summarized on table 10.2. 

Exposure Assumption Distribution Assumed Relevant Values Single Point Value  

Exposure duration Custom 7 years (average), 30 years or more (top 11 percent) 30 years 

Exposure frequency Triangular 330 (most likely), 365 (maximum) 350 days/year 

Exposure time Custom 16 (50 percent), 24 (50 percent) 24 hours 

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Figure 10.4. Sample Distributions of Exposure Assumptions in Human Populations...

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