(By authority conferred on the director of the department of consumer and industry  
services by sections 14 and 24 of 1974 PA 154, MCL 408.1014 and 408.1024, and  
Executive Reorganization Orders Nos. 1996-1 and 1996-2, MCL 330.3101 and  
R 325.60701 Electromagnetic radiation; scope of rule.  
Rule 1. (1) This rule 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  
rule does not apply to the deliberate exposure of patients by, or under the direction of,  
practitioners of the healing arts.  
(2) This rule replaces O.H. rule 2420.  
History: 2002 AACS.  
R 325.60702 Definitions.  
Rule 2. As used in these rules:  
(a) "Electromagnetic radiation" means that portion of the spectrum commonly  
defined as the radio frequency region, which for the purpose of these rules shall  
include the microwave frequency region.  
(b) "Partial body irradiation" means when part of the body is exposed to the  
incident electromagnetic energy.  
(c) "Radiation protection guide" means the radiation level that should not be  
exceeded without careful consideration of the reasons for doing so.  
(d) "Symbol" means the overall design, shape, and coloring  
frequency (rf) radiation sign shown in Figure G-11.  
the radio  
(e) "Whole body irradiation" means the entire body is exposed to the incident  
electromagnetic energy or an exposure where the cross section of the body is smaller than  
the cross section of the incident radiation beam.  
History: 2002 AACS.  
R 325.60703 Radiation protection guide.  
Rule 3. (1) For normal environmental conditions and for incident  
electromagnetic energy of frequencies from 10 MHz to 100 GHz,  
the radiation  
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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  
(2) 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, such as eyes and testicles,  
may be harmed if exposed to incident radiation levels significantly in excess of the  
recommended levels.  
History: 2002 AACS.  
R 325.60704 Warning symbol.  
Rule 4. (1) An employer shall ensure that the warning symbol for radio  
frequency radiation hazards consists of a red isosceles triangle above an inverted  
black isosceles triangle, separated and outlined by an aluminum color border. The  
words "Warning--Radio-Frequency  
triangle. See Figure G-11.  
Radiation Hazard" shall appear in the upper  
(2) American national standard safety color code for marking physical  
hazards and the identification of certain equipment, Z53.1-1953, shall be used for  
color specification. All lettering and the border shall be of aluminum color. ANSI  
Z53.1-1953 is adopted by reference in this rule. Printed copies of ANSI Z53.1-1953  
are available from Global Engineering Documents, 15 Inverness Way East,  
Englewood, Colorado 80112, telephone number 1-800-854-7179, website:  
available for inspection at the Michigan Department of Consumer and Industry  
Services, Standards Division, 7150 Harris Drive, P.O. Box 30643, Lansing, Michigan  
(3) The inclusion and choice of warning information or precautionary  
instructions is at the discretion of the user. If information is included, then the  
information shall appear in the lower triangle of the warning symbol.  
(4) Figure G-11 reads as follows:  
History: 2002 AACS.  
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