Re: Soft X-Ray Film

[joseph.greco@kodak.com]

A better answer can be provided if the X-ray energy range or upper limit is
provided.  The following responses are from two of our Kodak product
specialists:

*****************************************

My suggestion is a bit unconventional, but I think may be helpful. Please
realize that I am making no specific assumptions about this particular
customers needs; however, I have thought quite a bit about this kind of
question and we are entertaining a related solution for the very low energy
radioscopy-type of approach to apply to X-ray microscopy.
While the basic problem the general user faces is atmospheric attenuation
and scatter, many users may simply willing to put with the consequences. In
which case, all they need is a durable, raw, unovercoated sensor.
Generally, film only goes so far in this regard, and the user may have to
worry about the batch-to-batch variation on film overcoat.
The general solution that I recommend is the bare phosphor transmission
screen in the absolute dark. Kodak's Scientific Imaging Systems (SIS)
provides that product. It is called TranScreen LE or HE, were LE is
relevant in this case (thinner phosphor, higher yield and resolution). The
matching film is Biomax MS. The film may be placed in the screen folder,
and the bare phosphor oriented towards the object. Even though it is
uncoated, the phosphor is robust, will deal with mild abrasion, and can be
readily cleaned. Also, the screens are relatively inexpensive. The phosphor
will respond nicely to fractional Kev (it is GOS phosphor).

[Note - more info available at www.kodak.com]
*****************************************

What energy is he considering soft?  M film can be used down to 5 KeV in a
vacuum chamber.  Of course at that level, the film is bare with the object
to be imaged on top of it and basically a bare anode above.  Much below 5
KeV, the air is a significant attenuator.

*****************************************
J. M .Greco
RSO/LSO
Eastman Kodak
Rochester NY

joseph.greco@kodak.com





"Sandy Perle" <sandyfl@earthlink.net> on 11/10/2000 12:56:38 PM

Please respond to radsafe@romulus.ehs.uiuc.edu

To:   Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
cc:    (bcc: Joseph M. Greco/497509/EKC)
Subject:  Re: Soft X-Ray Film




Bill,

> Does anyone know where to purchase film for soft x-rays?  It used to be
> readily available, but it seems that Kodak no longer sells this.  Any
> information would be greatly appreciated.

What is the use for the film? Kodak does make Type 2 dosimetry film,
which does respond to x-ray energies down to between 5 - 10 keV.

Additional information would help. Also, Joseph Greco, Kodak, does
read Radsafe ( or at least he used to).

------------------------------------------------------------------------
Sandy Perle                        Tel:(714) 545-0100 / (800) 548-5100
Director, Technical                Extension 2306
ICN Worldwide Dosimetry Service          Fax:(714) 668-3149
ICN Pharmaceuticals, Inc.                E-Mail: sandyfl@earthlink.net
ICN Plaza, 3300 Hyland Avenue            E-Mail: sperle@icnpharm.com
Costa Mesa, CA 92626




************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html