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To be on the safe side in this comparison you may multiply the
measurement by 4 and use the result as base value for the compar-
ison. This is often done to make safe recommendations even in
case of readings on the low side despite still being within the toler-
ance band. One has to consider, however, that this may also lead to
higher values than actually existent.
Special case: Radar for aviation and navigation. Radar beams are
emitted by slowly rotating antennas. Therefore they are only meas-
urable and "audio-analysed" every few seconds for milliseconds.
This necessitates a special approach:
Set "Signal" to "peak". After a couple of radar beam passes read
out the highest number displayed. Because of the slow repetition
rate of the display necessary for all other measurements, the num-
bers will vary considerably and will only be displayed for a very
short period of time.
In most cases the measurement will be at the lower tolerance
band or in the extreme case even up to a factor of 10 too low.
Limiting values, recommendations and pre-
cautions
The "Standard der baubiologischen Messtechnik" (Standard for
Building Biology Measurements), SBM 2008, 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 situa-
tions.
Limiting values imposed by governments are mostly considerably
higher. There are indications of rethinking, though. The Internet pro-
vides large collections of recommendations and data.
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 elimi-
nate sources from within the same room (e.g. wireless routers, etc.)
Once this is completed, the remaining radiation will originate from
outside. For remedial shielding it is important to identify those areas
of all walls (including doors, windows and window frames!), of ceil-
12
moderately
conspicuous
conspicuous
0.1 - 10
very
extremely
conspicuous
10 - 1000
© Baubiologie Maes / IBN
© Gigahertz Solutions GmbH
> 1000
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