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Limiting values, recommendations and
precautions
The "Standard der baubiologischen Messtechnik" (Standard for
Building Biology Measurements), SBM 2015, classifies measure-
ments (per radio communication service), with a note of caution
"pulsed signals to be taken more seriously than continuous ones",
as follows:
Building Biology Recommendations as per SBM-2015
Peak
un-
meas-
conspicuous
urements
< 0.1
μW/m²
In fall 2008 the "Bund für Umwelt und Naturschutz Deutschland
e.V." (BUND) (environmental NGO) recommended a limiting value
of 1 μW/m² even for outdoor situations.
The Landessanitätsdirektion Salzburg (Austrian health authority)
proposed already in 2002 to lower the present "Salzburger
Vorsorgewert" (precautionary value) to 1 μW/m² for indoor situ-
ations.
Limiting values imposed by governments are mostly considerably
higher. There are indications of rethinking, though. The internet
provides large collections of recommendations and data.
Note for users of cellular phones and WLAN: Even below the
measurement range of the meters, even the highly sensitive
HF38B, a reliable communication is absolutely possible.
Identification of the sources of pollution
After determination of the total exposure the next step is to find
out where the radiation enters the examined room. As a first step
eliminate sources from within the same room (e.g. cordless
phones, wireless routers, etc.) Once this is completed, the remain-
ing radiation will originate from outside. For remedial shielding it is
important to identify those areas of all walls (including doors, win-
dows and window frames!), of ceiling and floor, which are pene-
trated by the radiation. To do this one should not stand in the
centre of the room, measuring in all directions from there, but
monitor the permeable areas with the antenna (LogPer) directed
and positioned close to the wall/ceiling/floor. The reason for this is
that the antenna lobe widens with increasing frequency. In addi-
tion reflections and cancellations inside rooms make it impossible
to locate the "leaks" accurately. See the illustrating sketch below!
Wand
Wall
Mur
Pared
Potentiell durchlässiger Bereich
Potentially permeable Area
antenna
12
moderately
conspicuous
conspicuous
0.1 - 10
no!
antenna
very
extremely
conspicuous
10 - 1000
© Baubiologie Maes / IBN
potentiell
durchlässiger
Bereich
© Gigahertz Solutions GmbH
> 1000
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