Re: Static Magnetic Field Gu

["GORDON MILLER" <GORDON.MILLER@quickmail.llnl.gov>]

        Reply to:   RE>Static Magnetic Field Guidelines

More recent guidance can be found in International Commission on Non-Ionizing
Radiation Protection. "Guidelines on Limits of Exposure to Static Magnetic
Fields," Health Phys. 66, 100-106 (1994).  ICNIRP specifies:

o	A 2000 gauss time-weighted average exposure criterion,

o	30 gauss as where metallic implants and tools can become hazardous,

o	10 gauss as where credit card stripes can be erased, and

o	5 gauss as the pacemaker/electronic implant warning criterion.

The 600 gauss limit was developed by Tom Tenforde, now with PNL, and I.  I
actually calculated the number.  The background for the 600 gauss limit is
found in G. C. Miller. "Exposure Guidelines for Magnetic Fields," J. American
Industrial Hygiene Association, 48, 957-968 (1987).

LLNL now uses the ICNIRP limit of 2000 gauss and I have written to the Chair
of the Physical Agents TLV Committee advising them to adopt the 2000 gauss
limit.

If there are further questions, please contact me at:

Internet: gordon.miller@quickmail.llnl.gov

Lawrence Livermore National Laboratory, P. O. Box 808  (L-289), Livermore, CA 
94551-0808

Phone (510) 423-8036
Fax (510) 423-1086



--------------------------------------
Date: 5/8/96 3:04 PM
To: GORDON MILLER
From: radsafe@romulus.ehs.uiuc.edu
To: RADSAFE --EKSMTP
cc: 497509  --KP40     GRECO JOSEPH M

*** Reply to note of 05/08/96 09:28
From: J.M.Greco, OHSP, Radiation Safety Officer, 1/320/KP/2-6261
Subject: Static Magnetic Field Guidelines
Sue - I believe the most widely-used guidelines for static mag fields are
the ACGIH TLVs (600 G  general workforce, 5 G pacemakers/other medical
devices).  I'm not aware of any other recognized standards other than
those mentioned.
***************

 Joe Greco, RSO/LSO  x83324
 e-mail:  jgreco@kodak.com
   "Illegitimi non carborundum"

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Subject: Static Magnetic Field Guidelines
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