intensifying screens

Stephanie Tucker stucker at umabnet.ab.umd.edu
Wed Jun 26 12:44:58 EST 1996









Hello - 

Intensifying screens SHOULD work with BOTH 32P and with 35S, shouldn't 
they?  It's the B-rays that are emitted by both types of particles that 
are probably the ones in question, as stated below.  It's just that 
with 32P gels, you don't notice the difference if they're screaming 
hot.

By the way, thanks for the info on WHY they work only at -70C!  It was 
interesting.

STOn Wed, 19 Jun 1996, Pamela Norton wrote:

> In article <4q8a8u$caa at mserv1.dl.ac.uk>, (Dave Johnston) <daj at nhm.ac.uk> wrote:
> 
> > Robyn, as I understand it:
> > 
> > (1) screen will have no effect with P32, they are designed for weak 
> > emittors like 35S -if a P32 emission gets past the X ray film without 
> ...
> > (2) for 35S, the weak emission is trapped on the screen and excites an 
> > electron. As the electron drops down again, you get a photon released 
> > which will affect the film. HOWEVER, you need 2 photons to change a 
> > "silver grain" on the film, the first mearly "excites" it, and if the 
> > second photon is not received within a certain time, the excited state is 
> > lo 
> -- 
> Pamela A. Norton, Ph.D.          Assistant Professor of Medicine
> Thomas Jefferson University
> Philadelphia, PA 19107           p_norton at lac.jci.tju.edu
> 
> 



More information about the Methods mailing list