[ RadSafe ] Beta emitters and external risks

[John Jacobus]

Dale,
You misunderstood what I am look for. If you had a
drop of a beta emitting radionuclide on a table what
betas are of concern if you are standing by the table?
by the way, F-18 and other PET radionuclides emitt
positron or beta+ particles. Shielding for the
annihilation photon radiation shields for the positron
particles. 

--- radsafe-bounces at radlab.nl <daleboyce at charter.net>
wrote:
> Hi John,
> 
> I wouldn't ignore skin dose as a radiation hazard.
At around 9 
> rad/hr/microcurie/cm^2 high energy beta emitters are
probably the biggest 
> radiation hazard normally encountered in a research
environment.
> 
> There are other beta emitters that present a hazard,
and some come 
> disguised. F-18 is known for its use in PETT with
the 511 annihilation 
> radiation, but the intermediate energy positrons can
give one heck of a beta 
> burn (and have in the past) before the gamma dose is
significant.
> 
> While low energy beta emitters such as C-14 may
present a reduced risk due 
> to air and dead layer absorption, one shouldn't
ignore the potential rish 
> from beta emitters.
> 
> ----- Original Message ----- 
> From: "John Jacobus" <crispy_bird at yahoo.com>
> To: "radsafe" <radsafe at radlab.nl>
> Sent: Friday, October 14, 2005 4:42 PM
> Subject: [ RadSafe ] Beta emitters and external
risks
> 
> 
> > Question:  Would you say that beta emitters pose
an
> > external radiation hazard or risk?  I am not
consider
> > skin contamination.
> >
> > Are there any (other) beta emitters that you would
> > consider to be a significant external hazard?
> >
> > What is your criteria for this judgement?
> >
> > (Background:  I would in a medical research
facility,
> > and we require beta shields for work involving
large,
> > e.g., 10 mCi/370 MBq, amounts of P-32.  Are there
> > other beta emitters we should worry about?)
> >
> > +++++++++++++++++++
> > On Oct. 5, 1947, in the first televised White
House address, President 
> > Truman asked Americans to refrain from eating meat
on Tuesdays and poultry 
> > on Thursdays to help stockpile grain for starving
people in Europe.
> >
> > -- John
> > John Jacobus, MS
> > Certified Health Physicist
> > e-mail:  crispy_bird at yahoo.com
> >
> >
> >
> >
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+++++++++++++++++++
On Oct. 5, 1947, in the first televised White House address, President Truman asked Americans to refrain from eating meat on Tuesdays and poultry on Thursdays to help stockpile grain for starving people in Europe. 

-- John
John Jacobus, MS
Certified Health Physicist
e-mail:  crispy_bird at yahoo.com


		
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