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

Appendix VI X-Radiation

In general, high power systems utilizing high-voltage transmitting or other high-power tubes (greater than about 20 kV) have potential to emit x-radiation. Because high power RF devices often require high operating voltages, it is considered appropriate to include in this Safety Code a few pertinent details regarding x-radiation safety. When the manufacturer's data or other observations indicate that a device may generate x-radiation, the following procedures and exposure limits are recommended:

1. The RF power generating component shall be inspected to determine if specified x-radiation shields are in their designated locations.
2. With the shields correctly positioned on the device, a survey shall be conducted to ensure that the x-radiation exposure does not exceed 0.5 mR (milliroentgen) in an hour at 5 cm from any accessible external surface of the device (0.5 mR = 129 nC/kg). The survey shall be conducted by personnel knowledgeable in measurements of x-radiation and in interpreting the results.
3. Survey instruments used for the measurement of x-radiation intensity shall not be susceptible to RF radiation. See references (39,40,41).
4. Survey procedures, reports and records shall be similar to those applied in Radiation Surveys as specified in Sections 6.1 and 6.2.