Bioinitiative 2012 recommended exposure limit conversion explained by Alasdair Philips and Per Segerbäck

Bioinitiative 2012 recommended exposure limit conversion explained by Alasdair Philips and Per Segerbäck

For those of you who are more technical…

(PS: P. 25 of the Bionitiative.org 2010 report states:

A scientific benchmark of 0.003 µ /cm2 or three nanowatts per centimeter squared for ‘lowest observed effect level’ for RFR is based on mobile phone base station-level studies. Applying a ten-fold reduction to compensate (my note: 0,0003 µw/cm2) for the lack of long-term exposure (to provide a safety buffer for chronic exposure, if needed) or for children as a sensitive subpopulation (if studies are on adults, not children) yields a 300 to 600 picowatts per square centimeter precautionary action level. This equates to a 0.3 nanowatts to 0.6 nanowatts per square centimeter as a reasonable, precautionary action level for chronic exposure to pulsed RFR. 

My question was: how many V/m does 0,0003 µw/cm2 equal?)

AF

On 2015-02-10 à 16:40, Alasdair Philips  wrote

0.034 V/m  for a CW (constant, or more usually continuous, and unmodulated with data in any form) signal. Could pulse higher if pulsed with gaps when it is off. This is the general conversion.

Average Power (as for ICNIRP and FCC normal rule comparisons) = 3 µW/m^2

It makes a much larger difference to the average power but not to the V/m (power is proportional to V/m squared)

 

0.034 V/m  for a CW signal. Could pulse higher if pulsed with gaps when it is off. This is the general conversion.

0.07 V/m if it were 25% on and 75% off over time (it is a square-root law and not linear)
Average Power (as for ICNIRP and FCC normal rule comparisons) = 1.5 µW/m^2

 

0.1 V/m if it were on for 10% and off for 90% of the time.

Average Power (as for ICNIRP and FCC normal rule comparisons) = 0.3 µW/m^2

So 3-fold for V/m and 10-fold for power.

Alasdair

2015-02-10 à 17:53, Per Segerbäck  wrote

Dear André,
The (next-up.org)  table has some slight problems.
It should be stated that for the relationships between the columns to be valid, the levels must be measured in the "far field". 

Also, the unit in the left column is dBm. dBm is  not  used for levels of EMF (the power density), but for power. 

(E.g. power dissipated in the 50 ohm receiver input impedance. 0 dBm is 1mW received. Unless you know the antenna area or antenna factor you do not know the corresponding field level).

See:
http://en.wikipedia.org/wiki/DBm

and
http://en.wiktionary.org/wiki/far-field
with complex discussion for the curious:
http://electronicdesign.com/energy/what-s-difference-between-em-near-field-and-far-field

Best  Regards
Per Segerback
Sweden
 

-----Original Message-----
From: André Fauteux [mailto:andre@maisonsaine.ca]
Sent: 10 February 2015 16:59
Subject: urgent request

I need confirmation concerning the BioInitiative 2012 recommendations.
What does 0,0003 uw/cm2 equal in volts per meter?
Thanks

--
Andre Fauteux, Editor
La Maison du 21e siècle magazine
2955 Domaine-lac-Lucerne
Ste-Adèle (Qc)  Canada J8B 3K9

450 228-1555

www.maisonsaine.ca
info@maisonsaine.ca