We can tell to cancel to sell their cell so we keep our cell and won't go
too early to the hell.

(sorry, it's a day like this to me)

Tamas


On Thu, Oct 1, 2009 at 4:04 PM, Sean Breheny <shb7@cornell.edu> wrote:

> Hi Adam,
>
> On Thu, Oct 1, 2009 at 10:21 AM, M. Adam Davis <stienman@gmail.com> wrote:
> > Radiation affects biological material.  That is to say that biological
> > material reacts or acts/grows/etc differently in a radio field than
> > otherwise.
>
> While I certainly would not declare RF exposure to be safe, I have
> never heard of any definitively proven effects of RF on living tissue
> beyond heating effects. Do you have information otherwise?
>
> >
> > However, minor magnetic fields of short duration appear to leave no
> > lasting change.  While under the influence of a field there is a
> > difference, but everything goes back to normal except in the case of
> > overexposure.
>
> I'm not sure why you make reference to magnetic fields here
> specifically. Are you talking about DC or low-frequency magnetic
> fields? At cell phone frequencies, there are going to be both electric
> and magnetic fields present in roughly comparable magnitude quite
> close to the antenna (i.e., the far field is not very far out)
>
>
> > Further, the radiation decreases exponentially by distance, so at one
> > meter there is no known biological affect for standard cell phones
> > signals.
>
> Actually, it is not quite exponential. Very close to the antenna
> (i.e., less than 1 wavelength) it may not decrease very much with
> distance at all. Between 1 and 10 wavelengths, it drops very fast
> (i.e., dipole field rather than a plane wave, roughly 1/r^6 for power,
> or 1/r^3 for field strength). Beyond 10 wavelengths, the power per
> area drops as 1/r^2 and the field strength drops by 1/r.
>
> >
> > Lastly, the transmitter in the phone is very, very, very weak - we're
> > talking mW, not watts of transmitting power.
>
> Are you sure about this? Given how warm the phone gets during a call,
> as well as the distance it must cover reliably, I'd guess that the
> peak power is about 1 or 2W and the average at least a few 100 mW.
>
> >
> > On the other hand, this is a pretty good reason to text instead of
> > call - the transmission burst is very small and short, and it's away
> > from the head.
>
> Interesting advice. I do not have a regular phone - only a cell phone.
> Therefore, I am particularly concerned about this. My strategy, since
> neither I nor most other people I call are big into texting, is to use
> headsets and get the phone away from my head, usually on the desk in
> front of me. I have found, though, that many headsets do not work all
> that well. I tried several wired headsets first and they had strange
> quirks like my phone sometimes deciding to mute the microphone of the
> headset for no apparent reason. So, I now use a Bluetooth earpiece -
> of course that itself is RF but much lower power.
>
> Sean
>
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