Page "Mobile phone radiation and health" Paragraph 5

The rate at which radiation is absorbed by the human body is measured by the Specific Absorption Rate ( SAR ), and its maximum levels for modern handsets have been set by governmental regulating agencies in many countries.

In the USA, the Federal Communications Commission ( FCC ) has set a SAR limit of 1. 6 W / kg, averaged over a volume of 1 gram of tissue, for the head.

In Europe, the limit is 2 W / kg, averaged over a volume of 10 grams of tissue.

SAR values are heavily dependent on the size of the averaging volume.

Without information about the averaging volume used, comparisons between different measurements cannot be made.

Thus, the European 10-gram ratings should be compared among themselves, and the American 1-gram ratings should only be compared among themselves.