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Re: Film Badge Efficiency at low energies
Obviously the response of the film will be a function of the wrappings
and other overlying material. However, I suggest that you check some of
the standard albeit older references including Klaus Becker's
Photographic Film Dosimetry (Focal Press 1962); Hine and Brownell (1956);
to name two, and also Kase, Bjarngard and Attix, Vol 2. (1987) which
shows an energy dependence curve down to 8 keV on p. 341. Spectroscopist
frequently use Cu targets which give rise to 8 keV characteristic x-rays,
as well as Fe (5.7 keV, I think), so you could glean some info from
standard texts (especially older ones). I suspect the NOD per C/kg
(formerly roentgen!) at 5 keV will be about 2-3 times that of the 662 keV
photons associated with Cs-137 decay for a typical photographic emulsion
in paper wrapping.
Ron Kathren
On Mon, 5 Jun 1995, Charles Meyer wrote:
>
> > Does anyone have an inkling as to the efficiency of
> > film for a 5-7 KeV X-ray source? Landauer has indicated that
> > their film is sensitive down to 5 KeV, but I've been unable to
> > get any additional information.
>
> Dr. Day,
> I doubt if anyone other than Landauer can speak specifically
> about their film's sensitivity to 5 KeV xrays. There is a good book
> on Grenz, or low energy xrays, for which I will give you a reference.
> The book is entitled Grenz Rays: An illustrated guide to the theory
> and practical applications of soft X-rays, by daniel Graham and John
> Thomson. Published by Pergamon Press, 1st Edition 1980, printed by A
> Wheaton & Co. Ltd, Exeter, UK, ISBN 0-08-025525. I'm sure you will
> find this book useful in making a determination.
>
>
> ***************************************
> Russ Meyer
> Internet: cmeyer@brc1.tdh.state.tx.us
> tel: 512/834-6688
> fax: 512/834-6654
> ***************************************
>