Answer to Question #10056 Submitted to "Ask the Experts"
The following question was answered by an expert in the appropriate field:
I recently underwent a nuclear medicine procedure using thallium-201 for cardiac stress test. How many types of are there? Is there strong and weak one? My doctor told me I was exposed to 6 mSv from 107 MBq (2.88 millicuries) on your website it indicates more (i.e. for 107 MBq about 17 mSv) possible?Another question I may have is: I have since read a lot of articles and I am concerned over the radiation I was exposed to during this test. I refuse to take another one. I was 32 when I took the nuclear stress test. Do I still have a chance at living a long life without getting cancer or am I now doomed to sometime get it in the future at a younger age than I should have because of this test? Are there a lot of people who get cancer within years of taking this test?
The short answer to your first question is that there is only one 201Tl (thallium-201). I am making a supposition here, but I believe I can explain the discrepancy. The dose from 201Tl is about 600 mrem per mCi. An administration of 2.88 mCi would result in a dose of about 17 mSv. Please note that I have rounded the numbers, since the actual radiation dose you received would depend on a variety of factors such as metabolism, hydration, urination frequency, etc., so using more exact numbers implies more precision than actually exists. These doses represent the total exposure from initial injection to total decay.
Answer posted on 13 January 2012. The information posted on this web page is intended as general reference information only. Specific facts and circumstances may affect the applicability of concepts, materials, and information described herein. The information provided is not a substitute for professional advice and should not be relied upon in the absence of such professional advice. To the best of our knowledge, answers are correct at the time they are posted. Be advised that over time, requirements could change, new data could be made available, and Internet links could change, affecting the correctness of the answers. Answers are the professional opinions of the expert responding to each question; they do not necessarily represent the position of the Health Physics Society.
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