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From: Mike Poulton
Subject: Re: Any ideas on measuring radiation in the home ?
Date: 1 Oct 2002 18:33:01 GMT
Organization: MTP Technologies
References: <%_wk9.52964$1C2.firstname.lastname@example.org> <3D9442F1.42F2FBAF@webaccess.net> <3D9467AC.9745AC66@webaccess.net> <8a%k9.56338$1C2.email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
On 01 Oct 2002, "News2020" said:
> The heat was off.
> Also, I am aware of the inverse square, etc. Several watts with a
> directed beam or laser will stay focussed.
No, the inverse square law applies to ALL RADIATED ENERGY. There is no
exception for lasers or other collimated sources. They behave like
small sections from an isotropic radiator. Of course, your aperture
must be small enough to be completely within the beam. What this means
is that no beam will "stay focused" (you really mean "collimated").
They all diverge according to the inverse square law.
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