ATTENUATION IN PERCENTAGES
The anti radiation products are extensively tested and optimized in the laboratory to provide the highest protection against radiation. To visualize the amount of radiation reduction, a radiation attenuation table is used. The units and concepts decibel (dB), percentages and μW/m2 are used.
DECIBEL
The decibel, dB symbol, is not a unit, but a ratio. Decibel is used within radio, microwave and fiber optic communication networks as a convenient measure of absolute power.
PERCENTAGE AND μW/m2
The second column of the table shows the percentage of the radiation reduction. In the example in the table we work with a measured radiation of 1000 μW/m2. If you want to know the protection percentage of a product, check the dB and follow the table below.
DETERMINING THE AMOUNT OF ATTENUATION (dB)
- Measure your own field strength in μW/m2, for example 1000 μW/m2
- Determine by what percentage you want to reduce the field strength (see second column in table)
- In the same row, look for the corresponding number in dB
dB
5
10
15
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
45
50
55
60
%
68.38
90.00
96.84
99.00
99.21
99.37
99.50
99.60
99.68
99.75
99.80
99.84
99.87
99.90
99.92
99.94
99.95
99.96
99.968
99.975
99.980
99.984
99.987
99.9900
99.9968
99.9990
99.9997
99.9999
1000
316.2
100.0
31.6
10.0
7.9
6.3
5.0
4.0
3.2
2.5
2.0
1.6
1.3
1.0
0.79
0.63
0.50
0.40
0.32
0.25
0.20
0.16
0.13
0.10
0.0316
0.0100
0.0032
0.0010
EXPOSURE ELECTROMAGNETIC FIELD STRENGTH (V/m)
A microwave is electromagnetic radiation in a higher frequency range, which is used for communication of television, mobile phone, WiFi, Bluetooth among other things. The waves vary in length from, for example, 1 m at a frequency of 300 MHz to 1 mm at a frequency of 300,000 MHz.
The maximum allowed amount of field strengths of the electromagnetic radiation to which you may be exposed are in the Netherlands:
- 28 V/m for 100 MHz to 400 MHz
- 61 V/m for 900 MHz, 1.800 MHz and 2.000 MHz to 300.000 MHz
However, this dates from 1998. In 2015, the SBM, in collaboration with doctors, scientists and building biologists, re-established the maximum permitted amount of field strengths, which are much lower than the standard, being:
- 0,6 V/m for outdoors
- 0,1 V/m for indoors
These values are considered a safe limit before you will experience any health damage.
(1.000.000 Hz = 1,0 MHz)
–
TV
3G
4G
5G
WIFI
DECT
MIN. (Hz)
50 Hz
2.000 MHz
850 MHz
700 MHz
2.400 MHz
880 MHz
MAX. (Hz)
2.500 MHz
2.000 MHz
2.600 MHz
26.000 MHz
5.000 MHz
1.900 MHz
