[Intl_DxMedPhys] Sanity Check Needed for Pb-212 HVL

[Gretchen Raterman Bell]

Greetings!

I am dipping my toe into shielding requirements for theranostics.  One of
the hot new isotopes of course is Pb-212.  I had looked at its decay chain
a while back and saw a rather high-yield MeV emission from its daughter
Tl-208 and figured we could forget about a reasonable amount of lead.  We'd
have to use time and distance.  HOWEVER today, I thought to look at the
Smith and Stabin paper that lists 1000+ isotopes with their gamma rate
factors and HVL, etc. data.  Pb-212 is listed as having an HVL of only
0.756 mm Pb, which is about 1/7th the HVL they list for F-18!  I understand
that F-18 is almost 100% positron decay, but I still find this difference
in HVL incredible.

Before going down a wild rabbit hole, I figured I'd probe the list for any
other insights into Pb-212.  We are starting a clinical trial soon using
it, and I've been tasked with writing up a Radiation Safety SOP.  In
addition, we are doing a reno of one of our NM departments, and they would
like to add dedicated theranostic injection rooms... so trying to see what
kind of lead to put in the walls.  (It's truly an impossible task, but I'm
giving it my "college try.")

Many, many thank yous in advance.

Gretchen R. Bell, M.S., DABR
Diagnostic Imaging Physicist
Ochsner Medical Center
(504)842-8506
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