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. The remaining radiation value (μW/m2) is shown in the third column.

DETERMINING THE AMOUNT OF ATTENUATION (dB)

  1. Measure your own field strength in μW/m2, for example 1000 μW/m2
  2. Determine by what percentage you want to reduce the field strength (see second column in table)
  3. In the same row, look for the corresponding number in dB
Example: If you want to reduce the radiation load from 1000 μW/m2 to 1, you need a radiation resistant product that protects 30 dB.

dB

%

UW/m2

0 0 1000
5 68,40 316
10 90 100
15 96,87 31,3
20 99 10
21 99,21 7,9
22 99,37 6,3
23 99,5 5
24 99,6 4
25 99,68 3,2
26 99,75 2,5
27 99,8 2
28 99,84 1,6
29 99,87 1,3
30 99,9 1
31 99,92 0,08
32 99,94 0,06
33 99,95 0,05
34 99,96 0,04
35 99,97 0,03
36 99,98 0,02
37 99,98 0,02
38 99,98 0,02
39 99,99 0,01
40 and higher 99,99 to 100 0,01

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)

                         

MIN. FREQUENCY (Hz)

MAX. FREQUENCY (Hz)

TV 50 Hz 2.500 Hz
3G 2.000 MHz 2.000 MHz
4G 850 MHz 2.600 MHz
5G 700 MHz 26.000 MHz
WIFI 2.400 MHz 5.000 MHz
DECT 880 MHz 1.900 MHz