In order to test for electromagnetic radiation in the radio frequency range, you need a radio frequency (RF) meter. To investigate if your cell phone emits electromagnetic radiation when making a phone call or sending a text message, and to determine the level of radiation at varying distances. This science project is based upon the following Science Buddies Clever Scientist Award winning project: Bose, Gautam.
What is the Federal Communications Commission (FCC)-mandated radiation limit for cell phones? What is the difference, in terms of frequency, between microwave frequencies and the more dangerous x-rays and gamma rays?
We also do our best to make sure that any listed supplier provides prompt, courteous service. Proceeds from the affiliate programs help support Science Buddies, a 501(c)(3) public charity. The first step is to build the jig so that you can easily measure microwave radiation emissions. The jig is a way to securely and accurately hold the phone a set distance from the to radio frequency (RF) meter.
Define a Need: You need to test the cell phone from the front, back, and all four sides with a RF meter.
The jig should be designed so that the cell phone is on one end while the RF meter is on the other end.
There should be a way to securely hold the RF meter without blocking the top and front of the meter.
The cell phone part of the jig should be able to freely rotate so that all sides can be measured. The top side of the RF meter should point towards the cell phone as the receiving antenna of the meter is mounted inside this side of the meter.
Since you need to measure the power at different distances, you will need to make the meter slide back and forth. Measure the average power coming from the front of the cell phone at a distance of 2 cm, as follows. While you hear the ringing, take an average power measurement as displayed by the light indicator labeled e on Figure 3 above.
Measure the average power coming from the back of the phone with the RF meter located 2 cm away, as follows. Measure the average power coming from the bottom of the cell phone with the meter located 2 cm away. Rotate your cell phone so the bottom is facing the RF meter and check if the distance to the top of the meter is still 2 cm.
Measure the average power coming from each side of the cell phone with the RF meter located 2 cm away. Repeat step 2 and average the data over all three trials for when the RF meter was 5 cm from the cell phone. Repeat step 2 and average the data over all three trials for when the RF meter was 15 cm from the cell phone. Is the average power send out by the phone the same in each direction (front, back, top, bottom, right side, left side)?
The Introduction mentions radiation levels decrease rapidly with increasing distance from the emitting source.
You can also create a map of the strength of Wi-Fi signals in a public place, your house or your school. Compared to a typical science class, please tell us how much you learned doing this project. The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. You've probably heard the expression "build a better mousetrap." Industrial engineers are the people who figure out how to do things better. Just as a potter forms clay, or a steel worker molds molten steel, electrical and electronics engineers gather and shape electricity and use it to make products that transmit power or transmit information.
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Most of us have one and many of us couldn’t do without one – but what if you were allergic to them? Long highlighted as a problem by environmentalists and sufferers, such reactions are still largely ignored or seen as exaggerated.
However, exposure to electromagnetic fields and the radio frequencies from mobile phones has been linked with the development of cancers, early onset dementia, brain tumours, lack of concentration, and interruption of sleep. While the studies that have made these links are not conclusive, the scientists say that neither would they expect them to be at this stage, since mobile phones have only been in extensive use for about a decade, whereas many cancers can take longer than this to develop.
However, it is believed that the current trend in their findings would point to taking precautionary steps to avoid over-exposure.


Electromagnetic fields are areas of energy emitted either naturally (from positive and negative electrical charges in the atmosphere) or by man using electric and magnetic energy. Mobile phones (and other forms of telecommunications) use high frequency radio waves in order to send messages over long distances. These non-ionising radio frequency fields can penetrate about a centimetre or so into the body, depending in the strength of the frequency, generating heat which in most people, is resolved. This thermal effect has previously not been thought to cause any harm, but studies are only now beginning to look more specifically at consequences of heating areas of the head (and brain), where most mobile devices are held. Current guidelines from the government and the World Health Organisation are that there is little cause for concern over exposure to electromagnetic fields or radiofrequency fields from mobile phones and similar such devices. A phone will also maintain connectivity with nearby base stations at regular intervals when in standby, so keep it in a place which is not near you. A child below the age of 16 is advised to only use a mobile phone for emergency calls only and if you want to reduce your own risk, then keep calls to a minimum and even try to do without it! As with our other products, manufacture is controlled by our proven quality system allowing both material and labour traceability. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. I recently bought some cellphone accessories, and as a free gift, the merchant gave me a "24K gold plating electromagnetic shielding sticker", whose instructions are all in Chinese, but I guess you're supposed to stick it onto your cellphone, and that's supposed to protect you from nasty E-M radiation. My initial reaction is that this is total quackery, but let me ask those more knowledgeable in the field: is there any substance to these things? Electromagnetic radiation can be nasty at some energies, but the EM radiation from your cell phone isn't dangerous. Ionizing is certainly the most immediate kind of harm that radiation can commit, but you can't conclude from this that non-ionizing kinds of radiation are per se harmless. It is possible but by no means certain that there are any significant health effects from using cellphones. You could produce shielding for a cellphone - but for it to have any significant effect on user field strength levels it would have to severely impact the phone's radiation pattern and would have a good chance of affecting how effective the phone was as a communicator.
There is also a prospect that adding "shielding" may make any effects that do exist worse by altering the field shape and maybe causing an area that is more sensitive to have increased exposure. One of the more disturbing (to me) was the suggestion that very heavy users developed certain carcinomas in the head, significantly more on the side closest to common cellphone use and overall significantly more than for the general population. My practice and advice in this and similar areas is "prudent avoidance" - do what you can to avoid what may be risk situations but don't let them wreck your life.
Locating the mains transformer equipped alarm clock away from your pillow when you sleep is of minimal effort.
Not buying a house near or under HV powerlines makes sense because of what others think as that will affect prices regardless of whether there is any effect or not.
And rental accomodation under a powerline will usually not be cheaper than similar accomodation elsewhere. If your children have left home and you are older than younger and favor house per $ over resale value then buying under powerlines may make much sense. Adding additional shielding, if the "gold" sheet is even real shielding, would do very little.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site. Not the answer you're looking for?Browse other questions tagged electromagnetism cellphone radiation or ask your own question. What is a safe level of electromagnetic radiation measured in terms of received signal strength indicator (RSSI) e.g. Most people own a cell phone, and in today’s society it would be difficult to function without one. CNET ranked the top 20 phones with the highest SAR levels and those with the lowest SAR levels. There are many options available to protect yourself, while still retaining the use of your phone. Mobilize is one of Disinfo’s newest documentaries that details the effects of cell phone radiation. I now have a superfluous body part near where I carried my cell phone for the last few years. What I’ve learned as a Freemason and why I left the order A Beginner's Guide to Sigil Craft The Flat Earth vs. Other exposure guidelines specify limits for human exposure to radio frequency emissions in terms of Specific Absorption Rate (SAR), a measure of the rate of absorption of radio frequency energy by the body. It's not as smart as you are, and it may occasionally give humorous, ridiculous, or even annoying results!
Add the average values for measurements with respect to the back, bottom, top, and each side of the phone choosing a different color for each direction. How does the power emitted by a Bluetooth device compare to the power emitted by your cell phone? If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help.


They find ways that are smarter, faster, safer, and easier, so that companies become more efficient, productive, and profitable, and employees have work environments that are safer and more rewarding. Electrical and electronics engineers may specialize in one of the millions of products that make or use electricity, like cell phones, electric motors, microwaves, medical instruments, airline navigation system, or handheld games. She is part of what is thought by some, to be a growing number of people who produce a reaction to electromagnetic pollution. Electromagnetic fields are present everywhere, are invisible to the human eye, and can vary in strength depending on frequency or wavelength. So that when you are making a call or sending a text message on your phone, hold the phone away from your body as this is when the unit will be actively sending strong signals.
This is because the RF field strength gets weaker the further away from the handset it is and so if your handset is away from your head, the RF field you’re exposing yourself to will be less.
Ultraviolet light (such as that created by the sun) is the lowest-frequency ionizing radiation. I just said it's a wrong conclusion to say \$x\in A\$ are dangerous, \$B\not\subset A\$, therefore any \$y\in B\$ are harmless.
You don't want to shield the electromagnetic field, because that's what makes the phone work. To be useful (if usefulness is in fact needed) and also not affect the phone's operation would require it to be designed for a specific phone's spatial and functional layout. You'll get some RF transfer along the wire but it will be much much less than than the affect from close proximity to the cellphone.
There have been numerous scientific studies and consequent peer reviewed papers that concluded that there were statistically significant hazards in some cases - and about as many others that concluded just the opposite.
But what if I told you that some studies (often ignored by mainstream media and politicians, surprise!) have found dangers associated with cell phone use?
The radiation is especially dangerous to the developing brains in children and adolescents. The highest SAR is tied between the Motorola Droid Maxx and the Motorola Droid Ultra, both emitting 1.54 SAR. Its official release is September 9th, but we’re mailing a limited quantity to those who preorder. In this science project, you will measure how much energy is send out by your phone in different directions and how it changes with increasing distance. You can use the RF meter listed in the Materials section of this project or a phone app as advised in the two projects listed below to measure the strength of Wi-Fi signals.
Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.
Anything you can wirelessly send from one computer to another, listen to on the radio, download on a mobile phone, or see on the television (not connected to cable) is sent wirelessly using radio waves, and the transmission and devices were designed by a radio frequency engineer. You might think from their name that industrial engineers just work for big manufacturing companies, but they are employed in a wide range of industries, including the service, entertainment, shipping, and healthcare fields.
Even if you want to make a shield there are much cheaper materials which perform almost as well as gold does, aluminium for instance. If a wired headset is used then adding a ferrite RFI shield (eg a purpose designed ferrite toroid or clamp around the cord outer - no electrical connection - would further reduce RF reaching the headset.
EMP is based on frequency as much as amplitude – frequency is quantum energy ignored by all the classical physic health standards. Ted Cruz's Father Preaches That His Son Is An "Anointed King" Who Will Bring The "End Time Transfer Of Wealth" Skeleton Key to the Conspiracy: The Eriksson Twins Yahweh = Satan. Only part of this energy will be absorbed by the body—so your measurements can not directly be compared to SAR limits.
Refer to the Science Buddies resource on the Engineering Design Process for more information. Oh, and I won first place in my seventh grade science fair, and I am going to Science Congress. Radio frequency engineers are typically electrical engineers who decided to specialize in radio frequency engineering. For example, nobody likes to wait in a long line to get on a roller coaster ride, or to get admitted to the hospital. Despite what some people think you don't need a magnetic material like steel (iron) to shield off alternating electromagnetic fields. Also, too often the conditions required to produce some effect prove far from representative of human reality. The shield layer may be a piece of light weight metal, but it can also be conductive paint. The magnetic field passing the shield creates eddy currents which in turn create a field countering the first one.



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