Global Warming Causes

Collective Dose Equivalent or Collective Dose

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The collective dose equivalent (in person-Sv), or more simply the collective dose, to a population is the sum of the effective doses to the individuals in that population. It is intended to be a measure of the overall impact. Use of the collective dose is appropriate if the health effects are linearly proportional to the dose (i.e., if the linearity hypothesis is valid) (see Section 4.3.3). Then, for example, the same number of cancers are expected if 1000 people each receive a dose of 200 mSv or if 100,000 people each receive a dose of 2 mSv. In each case, the collective dose is 200 person-Sv. The use of collective dose is controversial, especially when a large collective dose results from small doses to many people, because the underlying premise of linearity is controversial. We will return to this issue in the specific context of the collective dose from 14C (in Section 13.2.2).

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