Electromagnetic Radiation

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Electromagnetic Radiation

Postby cookies4life » Wed Jan 02, 2013 4:38 pm

I'm doing a science fair project about cell phone radiation and what types of material block the most radiation. I got a cell phone radiation sensor from Home Depot for about $20, it doesn't give me very accurate readings, and sometimes doesn't give any reading at all. I have tried every way to measure the cell phone radiation but the meter is very inaccurate. Any ideas on how I can finish my science fair project still on time??
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Project Question: What materials block the most electromagnetic radiation?
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Re: Electromagnetic Radiation

Postby rmarz » Wed Jan 02, 2013 6:16 pm

cookies4life - I checked to see what this model claims to do. The literature seems vague about what kinds of EMF can be detected, but even the Home Depot description lists the concerns about cell phone emissions. Most of these DIY EMF sensors seem to be manufactured and sold for detecting poor gasket or shielding issues around microwave ovens, potentially very high powered sources of radiation in the 2.45 GHz spectrum (a frequency not used by cellular phones, but close to frequencies used by many cordless phones). So there is a question if these detectors are capable of operating effectively in testing cell phone emissions. If you look at over 70 customer reviews of this model at the Amazon.com site, many buyers found it impossible to detect cell phone signals, but it readily sensed microwave oven radiation.

There is a Science Buddies project on this subject at - http://www.sciencebuddies.org/science-f ... ml#summary. If you haven't reviewed it, perhaps some of their tips and techniques for measurement may help. I don't have any personal experience with this project, so can't directly help beyond this. By the way, you should note that to operate at all, every cell phone must emit RF radiation. Is it all dangerous? What levels have been noted in other studies to be potentially dangerous to human tissue. There is a lot of research you can do to better understand the entire subject.

Rick Marz
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Re: Electromagnetic Radiation

Postby mdstjohn » Fri Jan 18, 2013 12:46 pm

Hi Cookies4Life;

You may want to review the radiation hazard standards. The Department of Defense uses DODI 6055.11 and describes the limits for safe radiation under different circumstances.

I run an anechoic chamber where we perform Electromagnetic Interference testing, in South Carolina. If you are nearby maybe we could support your research with some test data.

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