In risk characterization, a reference dose (RfD) of 0.007 means that
A) 0.7 percent of people are exposed to the environmental hazard
B) exposure to 0.007 milligrams of a pollutant per body weight per day over a lifetime should cause no harm
C) there is a 0.007 percent probability that the pollutant causes no harm
D) 7 out of 1 million people are affected by the pollutant

Question

Quizplus · Accepted Answer

The reference dose (RfD) is an estimate of the amount of a substance in food or drinking water that can be ingested daily over a lifetime without an appreciable health risk. A reference dose (RfD) of 0.007 means that exposure to 0.007 milligrams of a pollutant per body weight per day over a lifetime should cause no harm.

In Risk Characterization, a Reference Dose (RfD) of 0