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Re: [Phys-l] pinhole camera

On Apr 16, 2007, at 8:53 AM, Joseph Bellina wrote:

The problem with the pin hole X ray use is that it assumes that the X-
rays are reflected isotropically, when often they are not, so the pin
hole image is a convolution of the spacial array of the surface with
the intensity of the X-ray reflected in that direction.

1) Which reflection? In my mind it is only a matter of blocking versus unblocking of rays originating from different spots on the source.
2) A pin-hole can also be used to study a distribution of alpha and beta radioactivity on a flat source. _______________________________________________________
Ludwik Kowalski, a retired physicist
5 Horizon Road, apt. 2702, Fort Lee, NJ, 07024, USA
Also an amateur journalist at http://csam.montclair.edu/~kowalskil/cf/