From: firstname.lastname@example.org [mailto:email@example.com]On Behalf Of Phil Rutherford
Sent: Wednesday, January 12, 2005 2:20 AM
To: Jaro; RADSAFE
Subject: Re: question concerning stress tests
Exposures from nuclear stress tests can be considerable, at least to those of us who have to explain and justify every last millirem to regulators and activists.
Several years ago I had a stress test and made some post treatment measurements with a Bicron MicroR meter.
Injections of 30 mCi of Tc-99m and 4 mCi of Tl-201 result in a cumulative dose of ~600 mrem. Seven (7) hours after treatment, the exposure rate was 17 mR/hr in contact with the stomach and 20 microR/hr (twice background) at 30 feet. Exposure rate at stomach level after 2 days was ~2 mR/hr, and after 7 days was ~0.5 mR/hr. After 3 weeks, exposure rates were indistinquishable from background.
Yes, at those levels, a lot of patients are going to be setting of the increasing number of post 9/11 radiation monitors in airports, borders, etc.
See http://www.philrutherford.com/Stress_Test_2003.pdf for charts of exposure vs. distance and time.
Interestingly enough, when I asked the nuclear technician who administered the radiopharmaceuticals, how much exposure I would receive, he said "Oh, about the same as a chest X-ray (~10 mrem)." I do not know whether that was simple ignorance or deliberate misinformation.