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Interim Australian/New Zealand RF standa

At 08:27 A 22.4.98 -0700, Randy Ross wrote:
>Richard Smart wrote:
>> Dear ARPS Members,
>> In case you missed it, Standards Australia has just published AS/NZS
2772.1 (Int): 1998 Radiofrequency fields part 1: Maximum exposure levels -
3 kHz to 300 GHz.
>> The standard costs $36.50 or $29.20 if your organisation is a member of
Standards Australia.
> Is this not to be confused with ICNIRP Guidelines published in Heath
Physics vol74, No4 April 1998?

After several years of committee meetings and public comment an interim 
revised standard which replaces NZS 6609.1:1990 and AS 2772.1-1990, 
Radiofrequency radiation, Part 1: Maximum exposure levels - 100 kHz to 300 
GHz was published on 5 March 1998. The interim standard is a compromise 
document which broadly follows the 1988 guidelines of the Non-Ionizing 
Radiation Committee of the International Radiation Protection Association, 
and standards in other countries.  For the spectral range above about 10 MHz 
where thermal effects dominate, the basic limit of a specific absorption 
rate (SAR) of 0.4 W/kg for occupationally exposed persons has been retained, 
with the same derived limits as in the earlier Australian and New Zealand 
standards.  For frequencies around 1 MHz, however, the derived limits have 
been made more restrictive in line with those of the IRPA guidelines.  For 
frequencies above 400 MHz where other standards introduce a change in 
derived limits, corresponding to changes in SAR per incident unit power flux 
density, the interim standard retains frequency independent derived limits 
as previously, thus effectively incorporating a safety factor which is 
increasing with frequency.

The frequency range covered by the standard extends now down to 3 kHz. 
 Derived limits at low frequencies have been obtained by adopting the IRPA 
values for 100 kHz for the 3-100 kHz range, and this has created an anomaly 
in magnetic field limits at low frequencies.  Further changes from the 
earlier standard are the introduction of spatial averaging over a 30x30 cm 
area for field measurements, and much more detailed specification of 
requirements for compliance of mobile and portable transmitting equipment. 
 A further change is the disappearance of the ALARA (as low as reasonably 
achievable) requirement from the new standard as an inappropriate for an 
agent which has a threshold for effects.  A 'prudent avoidance' related type 
of statement has instead been incorporated.

The Standards organisations are inviting comments on the interim standard by 
5 March 1999, at which time, or earlier, the interim standard will be 
confirmed, withdrawn or revised.  Perhaps, in view of the difficulties in 
producing a revised local standard, adoption of the revised guidelines of 
the International Commission on Non-Ionizing Radiation Protection (published 
inthe April issue of Health Physics) would be the preferable forward 

Andrew C McEwan PhD
National Radiation Laboratory
PO Box 25-099
Christchurch, New Zealand

Ph 64 3 366 5059
Fax 64 3 366 1156