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.
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)
- 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
|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|