Unit Conversions on Radiation Measurements
Conversion Formulas - unit conversions for a fuller understanding
The following formulas are useful for estimating exposure from power cord and wireless technologies.
Mathematical formula for converting from milligauss (mG) to microTesla (μT)
1 milligauss = 0.1 microtesla
1 microtesla = 10 milligauss
Mathematical Conversion Formats for Wireless (Radio / Microwave) Broadcasts
Conversion from Power Density Units: mW / cm2 to W / m2 and μW / cm2 to mW / m2
1 mW / cm2 = 10,000 mW / m2 = 10W / m2
1 μW / cm2 = 10,000 μW / m2 = 10mW / m2
Mathematical Formula for Conversion from Power Density (W / m2) to Electric Field Intensity (V / m)
V / m = (W / m2 x 377) 1/2
Example: 1 mW / m2 = (0.001 * 377) 1/2 V / m = 0.6 V / m
Mathematical Formula for conversion from Electric Field Intensity (V / m) to Power Density (W / m2)
W / m2 = (V / m) 2/377
Example: 0.6 V / m = (0.6) (0.6) / 377 W / m2 = 0.001 W / m2 = 1 mW / m2
Type for conversion from dbM to Transmission Power (mW)
dBm = 10 * log10 (mW)
Example: 31 mW = 10 * log1031 = 15 dBm
Type for conversion from Transmission Power (mW) to dbM
mW = 10 ^ (dBm / 10)
Example: 15 dBm = 10 ^ 1.5 = 31 mW
Type for conversion from Transmission Power (mW) to Power Density
Note that this formula provides power density assuming a uniform distribution of power in all directions. Since the distribution of a cell tower may include lateral lobes, keep in mind that some directions may have a higher power density than others.
Power density = P / 4Πr2
where P is the transmission power, r is the distance and 4Πr2 is the surface of the sphere.
Example: 31 mW at r = 1m the distance translates to 31/4 * Π * (1) 2 = ~ 2.5 mW / m2
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