Posted 08 September 2008 - 04:30 AM
Microwave RF is non-ionising radiation, that is, there is not enough energy in the quantum packets involved to knock electrons off atoms, so it can't (on paper) cause the DNA damage that promotes cancer. Theoretically, the worst damage it can do is burn you, in exactly the same way infra-red energy can burn you, and nothing you can strap on a camera has a tenth the required output to do that.
However, there are occupational health limits on exposure. It's subject to many of the same considerations given cellphone use, which are mainly pretty speculative and are concerned with thermal effects and low-frequency modulation of a high-frequency carrier. Most of the preview links you can get are FM modulated in the C band and will contain a pronounced 50 or 60Hz component. How seriously you want to take this depends on... how seriously you want to take it.