DEPARTMENT OF LABOR AND ECONOMIC GROWTH  
DIRECTOR'S OFFICE  
OCCUPATIONAL HEALTH STANDARDS  
(By authority conferred on the director of the department of labor and economic  
growth by sections 14 and 24 of 1974 PA 154 and Executive Reorganization  
Orders Nos. 1996-1 and 1996-2, and 2003-1, MCL 408.1014, 408.1024, 330.3101,  
445.2001, and 445.2011)  
PART 681. RADIATION IN CONSTRUCTION: IONIZING AND  
NONIONIZING  
R 325.68101 Ionizing radiation.  
Rule 1. (1) In construction and related activities involving the use of sources of  
ionizing radiation, the pertinent provisions of the Nuclear Regulatory Commission  
Standards for Protection Against Radiation (10 CFR Part 20), relating to protection  
against occupational radiation exposure, shall apply.  
(2) Any activity which involves the use of radioactive materials or X-rays,  
whether or not under license from the Nuclear Regulatory Commission, shall be  
performed by competent persons specially trained in the proper and safe operation of  
such equipment. In the case of materials used under Commission license, only persons  
actually licensed, or competent persons under direction and supervision of the licensee,  
shall perform such work.  
(3) This rule replaces O.H. rule 6265.  
History: 2005 AACS.  
R 325.68102 Nonionizing radiation; laser equipment.  
Rule 2. (1) Only qualified and trained employees shall be assigned to install,  
adjust, and operate laser equipment.  
(2) Proof of qualification of the laser equipment operator shall be available  
and in possession of the operator at all times.  
(3) Employees, when working in areas in which a potential exposure to direct or  
reflected laser light greater than 0.005 watts (5 milliwatts) exists, shall be provided  
with the following antilaser eye protection devices:  
(a) Employees whose occupation or assignment requires exposure to laser  
beams shall be furnished suitable laser safety goggles which will protect for the  
specific wavelength of the laser and be of optical density (O.D.) adequate for the  
energy involved. Table E-3 lists the maximum power or energy density for which  
adequate protection is afforded by glasses of optical densities from 5 to 8.  
TABLE E-3  
SELECTING LASER SAFETY GLASS  
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Courtesy of www.michigan.gov/orr  
Intensity, Attenuation  
CW Maximum  
Power Density  
(watts/cm2)  
Optical Density Attenuation Factor  
(O.D.)  
10-2  
10-1  
1.0  
5
6
7
8
105  
106  
107  
108  
10.0  
Output levels falling between lines in this table shall require the higher optical  
density.  
(b) All protective goggles shall bear a label identifying the following data:  
(i) Laser wavelengths for which use is intended.  
(ii)Optical density of those wavelengths.  
(iii)Visible light transmission.  
(4) Areas in which lasers are used shall be posted with standard laser warning  
placards.  
(5) Beam shutters or caps shall be utilized, or the laser turned off, when laser  
transmission is not actually required. When the laser is left unattended for a  
substantial period of time, such as during lunch hour, overnight, or at change of  
shifts, the laser shall be turned off.  
(6) Only mechanical or electronic means shall be used as  
the internal alignment of the laser.  
a
detector for guiding  
(7) The laser beam shall not be directed at employees.  
(8) When it is raining or snowing, or when there is dust or fog in the air, the  
operation of laser systems shall be prohibited where practicable; in any event, employees  
shall be kept out of range of the area of source and target during such weather  
conditions.  
(9) Laser equipment shall bear a label to indicate maximum output.  
(10)Employees shall not be exposed to light intensities above any of the following:  
(a) Direct staring: 1 micro-watt per square centimeter.  
(b) Incidental observing: 1 milliwatt per square centimeter.  
(c) Diffused reflected light: 2 1/2 watts per square centimeter.  
(11)Laser unit in operation shall be set up above the heads of the employees,  
when possible.  
(12)Employees shall not be exposed to microwave power densities in excess of 10  
milliwatts per square centimeter.  
(13)This rule replaces O.H. rule 6270.  
History: 2005 AACS.  
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