EMF from RF/Cell towers What we can learn from Neil Cherry’s Sutro Tower research.

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Presentation transcript:

EMF from RF/Cell towers What we can learn from Neil Cherry’s Sutro Tower research

Cherry’s Sutro Tower study From the Sutro tower was the primary source of RF radiation in San Francisco. The study looked at the spatial distribution of 123 cases of white childhood cancer in the 50,000 children (age<21) in the area. Radiated power from Sutro Tower=18.3 MW

Spatial map of white childhood cancer for San Francisco The Sutro tower is at the intersection of the n-s and e-w lines.

RR=relative risk=measured cancer /Expected incidence (population norm) RR=1 means no added risk. RR=18 means an 18 fold increased incidence of cancer. Even 5 Km away from tower, note the 4 fold increase in cancer Radial Cumulative All Cancer for Childhood Cancer in 0.5 Km radial segments around the Sutro tower. P<0.0001

Best Curve fit- Power function Y=RR= X

Finding Border of Hazard Zone ( Finding Border of Hazard Zone (using Y=RR= X ) How far does the effect extend? Setting RR=1.1 (10% increased risk) gives radial distance of 36 Km Setting RR=1.01 (1% increased risk) gives radial distance of 41 Km Conclusion: Hazard zone extends about 40 Km from the 18.3 MegaWatt RF transmitter

Finding edge of hazard zones for lower power transmitters The Power density at distance D from a transmitter satisfies: Power density~Transmitter power/D 2 To find the safe distance from a 1 Watt Smart Meter 18.3 MW = 1 Watt gives D=9.35 meters (30 feet) (40Km) 2 D 2 As the Smart meter transmits directly at us, while the radio transmitter points above our head, add a factor of 2 for the smart meter: 60 feet safety zone. (Factor of 2 is verified on next page)

Verifying the factor of 2: In the youtube video Dark Side of Smart Meters, Rob States shows the level of radiation 3 feet from the smart meters is approximately equal to the radiation levels 2 Km from the Sutro tower. Multiplying by 20, the radiation levels 60 feet from the Smart Meter should be approximately equal to the levels 40 Km from the Sutro tower, which is where the hazard zone ends. So one should stay at least 60 feet from the smart meter to be safe. (92 feet is even safer)

Finding edge of hazard zones for lower power transmitters The Power density at distance D from a transmitter satisfies: Power density~Transmitter power/D 2 To find safe distance from a 100 Watt radio transmitter 18.3 MW = 100 Watt gives D=93.55 meters (40Km) 2 D 2 Here we do not need to multiply by an extra factor as we are comparing one radio transmitter to another

References Link To Neil Cherry’s paper Childhood Cancer in the Vicinity of the Sutro Tower, San Francisco For a more complete presentation on Smart Meters and the Sutro Tower research, see Youtube: Dark Side of Smart Meters, by electrical Engineer Rob States Youtube: Dark Side of Smart Meters, by electrical Engineer Rob States