[Code of Federal Regulations]
[Title 29, Volume 5]
[Revised as of July 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 29CFR1910.97]

[Page 223-225]
 
                             TITLE 29--LABOR
 
CHAPTER XVII--OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT 
                                OF LABOR
 
PART 1910_OCCUPATIONAL SAFETY AND HEALTH STANDARDS--Table of Contents
 
         Subpart G_Occupational Health and Environmental Control
 
Sec. 1910.97  Nonionizing radiation.

    (a) Electromagnetic radiation--(1) Definitions applicable to this 
paragraph. (i) The term electromagnetic radiation is restricted to that 
portion of the spectrum commonly defined as the radio frequency region, 
which for the purpose of this specification shall include the microwave 
frequency region.
    (ii) Partial body irradiation. Pertains to the case in which part of 
the body is exposed to the incident electromagnetic energy.
    (iii) Radiation protection guide. Radiation level which should not 
be exceeded without careful consideration of the reasons for doing so.
    (iv) The word ``symbol'' as used in this specification refers to the 
overall design, shape, and coloring of the rf radiation sign shown in 
figure G-11.
    (v) Whole body irradiation. Pertains to the case in which the entire 
body is exposed to the incident electromagnetic energy or in which the 
cross section of the body is smaller than the cross section of the 
incident radiation beam.
    (2) Radiation protection guide. (i) For normal environmental 
conditions and for incident electromagnetic energy of frequencies from 
10 MHz to 100 GHz, the radiation protection guide is 10 mW/cm.\2\ 
(milliwatt per square centimeter) as averaged over any possible 0.1-hour 
period. This means the following:

Power density: 10 mW./cm.\2\ for periods of 0.1-hour or more.
Energy density: 1 mW.-hr./cm.\2\ (milliwatt hour per square centimeter) 
during any 0.1-hour period.


This guide applies whether the radiation is continuous or intermittent.
    (ii) These formulated recommendations pertain to both whole body 
irradiation and partial body irradiation. Partial body irradiation must 
be included since it has been shown that some parts of the human body 
(e.g., eyes, testicles) may be harmed if exposed to incident radiation 
levels significantly in excess of the recommended levels.
    (3) Warning symbol. (i) The warning symbol for radio frequency 
radiation hazards shall consist of a red isosceles triangle above an 
inverted black isosceles triangle, separated and outlined by an aluminum 
color border. The words ``Warning--Radio-Frequency Radiation Hazard'' 
shall appear in the upper triangle. See figure G-11.
    (ii) American National Standard Safety Color Code for Marking 
Physical Hazards and the Identification of Certain Equipment, Z53.1-
1953, which is incorporated by reference as specified in Sec. 1910.6, 
shall be used for color specification. All lettering and the border 
shall be of aluminum color.

[[Page 224]]

    (iii) The inclusion and choice of warning information or 
precautionary instructions is at the discretion of the user. If such 
information is included it shall appear in the lower triangle of the 
warning symbol.
[GRAPHIC] [TIFF OMITTED] TC27OC91.024

      Figure G-11--Radio-Frequency Radiation Hazard Warning Symbol

[[Page 225]]

    (4) Scope. This section applies to all radiations originating from 
radio stations, radar equipment, and other possible sources of 
electromagnetic radiation such as used for communication, radio 
navigation, and industrial and scientific purposes. This section does 
not apply to the deliberate exposure of patients by, or under the 
direction of, practitioners of the healing arts.
    (b) [Reserved]

[39 FR 23502, June 27, 1974, as amended at 61 FR 9236, Mar. 7, 1996]