Site:
Location:
Total Band Exposure Quotient:
Total Number of Measurements:
NGR:
Start time:
Officer:
Ratcliffe College
Proposed New School Building
1.23243E-05
4
SK 6257 1529
27/06/2011 15:07
SS and NW
(no photo)
Measurement location: Proposed New School Building
GSM 900
Power Density
959.2
955.4
951.6
947.8
944
928.6
924.8
921
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
1E-08
1E-09
ICNIRP Limit
Page 1 of 4
Power
ICNIRP
Frequency Density Maximum Exposure
(MHz)
(W/m2)
(W/m2)
Quotient
930.6 7.01E-06
4.653 1.51E-06
946 5.45E-06
4.73 1.15E-06
955.8 4.82E-06
4.779 1.01E-06
941 4.69E-06
4.705 9.98E-07
943.8 4.66E-06
4.719 9.88E-07
956.6 4.07E-06
4.783 8.51E-07
946.2 1.54E-06
4.731 3.26E-07
930.4 1.37E-06
4.652 2.94E-07
944 1.23E-06
4.72 2.61E-07
941.2 1.02E-06
4.706 2.17E-07
Band Exposure Quotient:
7.6E-06
Power
ICNIRP
Frequency Density Maximum Exposure
(MHz)
(W/m2)
(W/m2)
Quotient
1842.6 2.01E-06
9.213 2.19E-07
1823.4 7.98E-07
9.117 8.75E-08
1844.8 5.16E-07
9.224 5.59E-08
1846.6 4.66E-07
9.233 5.05E-08
1842.8 2.81E-08
9.214 3.05E-09
1823.2 2.31E-08
9.116 2.53E-09
1842.4 2.21E-08
9.212 2.39E-09
1825.6 2.15E-08
9.128 2.36E-09
1871.2 1.98E-08
9.356 2.12E-09
1846.8 1.95E-08
9.234 2.11E-09
Band Exposure Quotient:
4.27E-07
GSM 1800
PowerDensity
1876.2
1870.6
1865
1859.4
1853.8
1848.2
1842.6
1825.6
1820
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
1E-08
1E-09
ICNIRP Limit
TETRA (high)
424.975
ICNIRP Limit
424.525
424.075
423.625
423.175
Power Density
422.725
420.9
420.45
420
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
UMTS
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
Power Density
ICNIRP Limit
Page 2 of 4
Power
ICNIRP
Frequency Density Maximum Exposure
(MHz)
(W/m2)
(W/m2)
Quotient
420.725
2.9E-07 2.103625 1.38E-07
420.75
2.8E-07 2.10375 1.33E-07
424.6 2.78E-07
2.123 1.31E-07
423.925 2.74E-07 2.119625 1.29E-07
420.975
2.7E-07 2.104875 1.28E-07
423.8 2.68E-07
2.119 1.27E-07
423.125 2.68E-07 2.115625 1.27E-07
423.775 2.68E-07 2.118875 1.26E-07
424.975 2.67E-07 2.124875 1.25E-07
422.7 2.65E-07
2.1135 1.25E-07
Band Exposure Quotient:
1.29E-06
Power
ICNIRP
Frequency Density Maximum Exposure
(MHz)
(W/m2)
(W/m2)
Quotient
2112.8 6.24E-06
10 6.24E-07
2152.4 4.19E-06
10 4.19E-07
2147.3 1.68E-07
10 1.68E-08
2142.5 1.65E-07
10 1.65E-08
2137.4 1.63E-07
10 1.63E-08
2157.2 1.63E-07
10 1.63E-08
2132.6 1.62E-07
10 1.62E-08
2162.3
1.6E-07
10
1.6E-08
2167.2 1.53E-07
10 1.53E-08
2117.7 1.52E-07
10 1.52E-08
Band Exposure Quotient:
1.17E-06
EM Exposure Background
All radio waves are electromagnetic waves (“EM”), which are composed of electric and magnetic fields. These
waves are referred to as „non-ionising radiation‟ as distinct from the ionising radiation produced by radioactive
sources. We are all regularly exposed to EM radiation from a variety of sources.
Exposure to EM waves is measured in terms of the electric and magnetic field strengths, which are produced by a
transmitter at locations, which could be accessed by the public. The electric field strength, E, is measured in volts
per meter [V.m-1]. The power that could be absorbed by an object at a given location is proportional to the area of
the object multiplied by the square of the electric field strength.
In this report, the Exposure Quotient (“EQ”) is calculated to express the ratio of the measured power density
levels (expressed in W/m2) to the ICNIRP Reference power density levels (derived from the Reference field
strength levels). The EQ is then summed over all the frequencies in each of the surveyed bands to yield the band
exposure quotient as shown in the Survey Results section of this document. A band EQ of 1 (unity) means that
the ICNIRP Reference level has been reached at the surveyed frequency band.
Page 3 of 4
Glossary
Site:
Location:
Band:
NGR:
GPS:
Start Time:
The building or area around which sets of measurements are taken
The position within a site at which a single set of measurements is taken. A set of measurements
A portion of the electromagnetic spectrum reserved for specific radio services
The Ordnance Survey national grid reference coordinates of the location. In this survey NGRs are
The Global Positioning System
The date and time at which the receiver started taking its measurements at a location
Officer:
Receiver:
The name of the Ofcom representative who carried out the audit
The receiver used to perform the measurements
The antenna used to perform the measurements
Antenna:
The maximum measured electric field strength (dB(μV/m)) converted to an equivalent power
Exposure:
Power Density:
The electromagnetic energy flowing through a unit area normal to the direction of propagation in a
ICNIRP Limit:
The reference level given by the International Commission for Non-Ionizing Radiation Protection
(ICNIRP) for general public exposure to electromagnetic fields
Frequency Exposure Quotient:
The ratio of the measured maximum power density to the ICNIRP limit at a given frequency. A
value close to 1 signifies that exposure levels could be near to the ICNIRP limit for that frequency
Band Exposure Quotient:
The sum of the frequency exposure quotients for a single band at a location
Total Band Exposure Quotient:
The sum of the frequency exposure quotients for all of the measured bands at a location
GSM:
TETRA:
UMTS:
Global System for Mobile communication
Terrestrial Trunked Radio
Universal Mobile Telecommunications System (Third Generation mobile-phone services)
1.00E-03:
1.00E-06:
1.00E-09:
1.00E-12:
Exponential (or „scientific‟) number format. Equal to one thousandth
Equal to one millionth
Equal to one thousand-millionth
Equal to one million-millionth
Page 4 of 4