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Radiation from thyroid uptake scan (I123)

Hello,

What is the effective radiation dose from a NaI 123 thyroid uptake and scan test? I see conflicting reports below.

0.14 mSv here.

http://snmmi.files.cms-plus.com/Fahey_PAAB_Risk_May2012_final.pdf

3.2 mSv here.

http://www.racgp.org.au/afp/2012/august/thyroid-scans/

1 mSv here.

http://www.ehrs.upenn.edu/media_files/docs/pdf/websiteinfo%282%29.pdf

4.8 mSv here.

http://www.xrayrisk.com/calculator/calculator-normal-studies.php?id=40

Does anyone know what the real number is?

Thanks!
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