Every Amateur Radio Operator should be aware that there may be health risks associated with exposure to Radio Frequency (RF) energy. Normally, the levels of power, and antennas used by Amateurs result in levels which are considered safe by government authorities, but if you run the legal power limit, or lower than average antennas, read on....
In Canada, the rules and guidelines covering the subject of RF Safety, are published by the Federal Government in a document entitled "Safety Code 6" It is a long and very technical document, but reading the material available at the following web sites should help to understand the significance.
Industry Canada does not require that all Canadian amateurs evaluate their transmitting stations for compliance with Safety code 6, but Radio Amateurs of Canada provides the following information to help you decide what might be appropriate in your situation.
The following links provide access to a great deal of information about RF Safety and Amateur Radio. The information is provided by the ARRL to help US amateurs understand and respond to the FCC Regulations governing RF Safety. These rules are similar to but not necessarily the same as the Canadian regulations set out in Safety Code 6.
The following links to calculators and computer programs will allow you to estimate minimum safe distances from your antennas, based on the FCC regulations. (While Canadian regulations are similar, they are not necessarily exactly the same.)