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EMF & RF Safety Levels - A Comparative Guide ScanTech

www.scantech7.com 214.912.4691

EMF Levels & Safety

It can be very hard to say exactly what levels of EMF are safe, because safety in this arena is often a relative concept

based on frequency, exposure time, and possible individual sensitivity. Even then, studies are often considered incon-

clusive plus there is the potential for political and financial agenda to steer perception one way or the other.

In order to be fair and equitable while remaining informative, this document has been assembled in order to examine /

compare / contrast various safety standards, average environmental levels and references along a continuum to better

explain technical measurements in context. This document is offered free of charge, though if published, posted or

reproduced in any fashion, crediting ScanTech as the document creator is requested.

Magnetic Fields Conversion Table

1 mG (milliGauss) = 100 nT (nanoTesla)

1 nT = 10 uG (microGauss) or 0.01 mG

100 microTeslas = 1 Gauss

1 microTesla = 10 mG

1 milliTesla = 10 Gauss 1 Tesla = 10,000 Gauss

1 nT = 1000 pT (picoTeslas) = 0.01 mG (10 microGauss) strongest brainwave is 1,000 times less

1 pT = 1000 fT (femtoTesla)

1 nT = 1,000,000 fT The best resolution of a SQUID (Super Quantum Interference Device) is 1,000,000 times less

Magnetic Fields - A Relative Comparison

LOW LEVEL MAGNETIC FIELDS

Smallest value in a magnetically shielded room 10^-10 Gauss (0.1 nanoGauss)

SQUID 1.0 fT (femtoTesla)

(0.1 nanoGauss)

Human Brain Magnetic Field 0.1 – 1.0 pT (picoTeslas)

( 0.01 - 0.1 microGauss)

Human Heart Magnetic Field 50^-12 Tesla (5 microGauss)

Galactic magnetic field 10 microGauss

Solar Wind 50 microGauss

Interstellar molecular cloud 1 milligauss

Interstellar Space 10^-6 Gauss (1 microGauss)

Summary of content (9 pages)

PAGE 1
EMF & RF Safety Levels - A Comparative Guide www.scantech7.com ScanTech 214.912.4691 EMF Levels & Safety It can be very hard to say exactly what levels of EMF are safe, because safety in this arena is often a relative concept based on frequency, exposure time, and possible individual sensitivity. Even then, studies are often considered inconclusive plus there is the potential for political and financial agenda to steer perception one way or the other.
PAGE 2
EMF & RF Safety Levels - A Comparative Guide www.scantech7.com Hypothesized & Observed Animal Sensitivies to Magnetic Fields Honeybees Homing Pigeons Sharks & Whales Lowest level to cause reaction in Electromagnetically Sensitive Patients Swedish Safety standard California Safety Limit for Public Schools Indoor EMF levels (when good wiring practices followed) New Swiss Standard Maximum residential levels in Brentwood TN & Irvine, CA ScanTech 214.912.4691 0.25 mG 0.1 mG 0.5 mG 0.1 - 0.2 mG 1.
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EMF & RF Safety Levels - A Comparative Guide www.scantech7.com ScanTech 214.912.
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EMF & RF Safety Levels - A Comparative Guide www.scantech7.com ScanTech 214.912.4691 ACGIH Occupational Threshold Limit Values for 60-Hz EMF American Conference of Governmental Industrial Hygienists (ACGIH) is a professional organization that facilitates the exchange of technical information about worker health protection. It is not a government regulatory agency.
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EMF & RF Safety Levels - A Comparative Guide www.scantech7.com ScanTech 214.912.4691 RF Levels & Safety OSHA 1910 Subpart G 1910.97 Occupational health and environmental control Non-ionizing radiation The exposure limit in this standard (10 mW/sq. cm.) is expressed in voluntary language and has been ruled unenforceable for Federal OSHA enforcement. The standard does specify the design of an RF warning sign. For PCS antennas, the 1992 ANSI/IEEE exposure standard for the general public is 1.
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EMF & RF Safety Levels - A Comparative Guide www.scantech7.com ScanTech 214.912.4691 tropic Radiated Power) for 802.11b (2.4GHz) devices A study conducted in the Unites States found that, in large cities , the average background RF levels were about 50 μ W/m 2 . About 1% of people living in large cities are exposed to RF fields exceeding 10 mW/m 2 . Higher RF field levels can occur in areas located close to transmitter sites or radar systems.
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EMF & RF Safety Levels - A Comparative Guide www.scantech7.com ScanTech 214.912.4691 body containing blood-forming organs. However there is no scientific evidence of risk at doses below about 50 millisieverts in a short time or about 100 millisieverts per year. At lower doses and dose rates, up to at least 10 millisieverts per year, the evidence suggests that beneficial effects are as likely as adverse ones. High radiation areas are those where a person could receive more than 100 millirem in an hour.
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EMF & RF Safety Levels - A Comparative Guide www.scantech7.com ScanTech 214.912.4691 RADIATION LEVELS & THEIR EFFECTS The following table gives an indication of the likely effects of a range of whole body radiation doses and dose rates to individuals: 10,000 mSv (10 sieverts) as a short-term and whole-body dose would cause immediate illness, such as nausea and decreased white blood cell count, and subsequent death within a few weeks.
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EMF & RF Safety Levels - A Comparative Guide www.scantech7.com NOISE LEVELS OSHA Safety Limits 90 dB 8 hours 92 dB 6 hours 95 dB 4 hours 97 dB 3 hours 100 dB 2 hours 102 dB 1.5 hours 105 dB 1 hour 110 dB 0.5 hours 115 dB 0.25 hours or less ScanTech 214.912.