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Limits of Human Exposure to Radiofrequency Electromagnetic Energy in the Frequency Range from 3 kHz to 300 GHz

 

Technical Guide for Interpretation and Compliance Assessment of Heath Canada's Radiofrequency Exposure Guidelines

 
Guidelines for the Measurement of Radiofrequency Fields at Frequencies from 3 kHz to 300 GHz

 

Safety Code 6 Regulations

The Radiation Protection Bureau of Health Canada has issued a series of safety codes. Canada's Safety Code 6 is titled “Limits of Human Exposure to Radiofrequency Electromagnetic Energy in the Frequency Range from 3 kHz to 300 GHz.” The official document number is HC Pub:091029.

Exposure Limits

The latest version of Safety Code 6, which was updated in 2009, still provides a two-tier set of RF exposure limits that earlier versions did, but there is a major change in nomenclature. Earlier versions referred to persons in the higher tier as “RF and Microwave Worker while the more restrictive tier referred to persons not classified as an RF or microwave worker and for the general public. There were no definitions or specific qualifications that define who qualifies as an RF worker. The updated version of Safety Code 6 has Maximum Permissible Exposure (MPE) limits for Controlled Environments and Uncontrolled Environments and now provides a reasonable definition of a controlled environment. The 2009 update does not have any changes in exposure limits.

The limits for the electric field are similar to the limits in the 1997 FCC Regulations. The difference occurs between 1 and 30 MHz. Safety Code 6 and the ICNIRP standard have variable limits from 1 to 10 MHz for the electric field. All the U.S. standards (IEEE, ANSI, FCC, ACGIH, and DOD) plus the NATO standard have variable limits from 3 to 30 MHz. Safety Code 6 includes relaxed limits for magnetic fields below 30 MHz. It also includes limits for induced and contact currents.

Health Canada has also issued another document that provides compliance guidelines titled "Technical Guide for Interpretation and Compliance Assessment of Heath Canada's Radiofrequency Exposure Guidelines."

The Spectrum Management and Telecommunications Bureau of Industry Canada has a measurement practices document that is similar to IEEE C95.3–2002. GL–01, titled “Guidelines for the Measurement of Radiofrequency Fields at Frequencies from 3 kHz to 300 GHz,”was last updated in October 2005.

Electric Field Limits

Exposure limits for the electric field are shown in the two tables below.

Exposure Limits for Controlled Environments
Frequency (MHz) Electric Field (V/m) Power Density (W/m²)
0.003–1.0 600  
1.0–10.0 600/f  
10–300 60 10
300–1,500   f/30
1,500–15,000   50
15,000–150,000   50
150,000–300,000   3.33 x 10-4f

 

Exposure Limits for Uncontrolled Environments
Frequency (MHz) Electric Field (V/m) Power Density (W/m²)
0.003–1.0 280  
1.0–10.0 280/f  
10–300 28 2
300–1,500   f/150
1,500–15,000   10
15,000–150,000   10
150,000–300,000   6.67 x 10-5f

 

The time averaging period is 6 minutes up to 150 GHz.

Other Limits

The limits for the magnetic field are higher below 30 MHz. There are also exposure limits for induced and contact currents.