Limits of Human Exposure to Radiofrequency Electromagnetic Fields in the Frequency Range from 3 KHZ to 300 GHZ - Safety Code 6

Appendix II Maximum Exposure Duration for Time Periods Less Than 0.1 h and Frequencies Below 15 000 MHz

For exposure durations less than 0.1 h (6 min), higher exposure limits than those specified in Tables 1 and 5 are permitted. For the general public, this is not a very practical situation, as it is usually difficult to control how long a person can remain in a particular location where higher RF fields are present. However, it may be applied to devices operating in an intermittent manner, e.g., where RF power is on, for example, for 2 minutes every 10 minutes.

For RF workers, exposures to higher fields for short periods of time may be necessary for operational purposes. Exposure durations shall then be strictly controlled in order not to exceed the limits specified in Section 2.1.1. One minute is assumed here to be the shortest duration which is of practical importance. Elevated exposures of electric and magnetic fields or power density are allowed for durations shorter than 0.1 h (6 min) as long as the equations in Section 2.3.1 apply.