Re: Y-90

["Carell B Johnson" <idias@interchange.ubc.ca>]

Jack and other radsafers



<Jack_Earley@RL.GOV>wrote on Tuesday, February 12, 2002  at 12:19 PM



> I was "somewhat" surprised today to hear a nuc safety rep say that since

> Sr-90 is pure beta, it doesn't need to be considered in a shielding

> calculation.

> can someone tell me why there's such a difference?



Y-90m is not a progeny of Sr-90, but Y-90 is.



>When I mentioned that it's in equilibrium w/ Y-90, which emits

> some significant gammas, I was even more surprised to hear him say Y-90

> doesn't emit gammas.



 ALL beta emitters emit internal bremsstralhung photons and the beta rays

also

 produce external bremstralhung photons as they interact with material. The

energy of these photons range from 0 to the maximum beta energy.



John R Johnson







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

You are currently subscribed to the Radsafe mailing list. To unsubscribe,

send an e-mail to Majordomo@list.vanderbilt.edu  Put the text "unsubscribe

radsafe" (no quote marks) in the body of the e-mail, with no subject line. You can view the Radsafe archives at http://www.vanderbilt.edu/radsafe/