Re: Thalium Stress Test (fwd) -Reply

[Jim Muckerheide <muckerheide@mediaone.net>]

IWILLIM@ip3gate.usa.com wrote:
> 
> CRC Handbook of Nuclear Med. and Clinical Imaging give an administered
> activity of 1.5 mCi (55.5 MBq).  WB dose of 0.24 rads (2.4 mGy) and
> lg. intestine dose of 4.1 rads (41 mGy).
> 
> This corresponds nicely with NCRP 100; Exposure to US Population from
> Diagnostic Medical Radiation.  0.045 mGy/MBq or .166 rads/mCi.
> 
> At our plant, persons tend to alarm our portal monitors for 4 to 5
> weeks after receiving medical Tl-201 due to the impurity of Tl-202 (T1/2 =
> 12.23 days).
> 
> Matt Williamson
> Indian Point Unit 3
> williamson.m@nypa.gov

Thanks, Matt.

This narrows it to a factor of 10 compared to other estimates as I understand
them (esp. 0.6 rem/mCi x 4 Ci)  :-)

I appreciate the note on the impurity re the longevity of the monitor response
vs 1/2 life of Tl-201.

Regards, Jim Muckerheide
jmuckerheide@delphi.com