Homework Help: chemistry

Posted by Boo Boo on Sunday, October 7, 2012 at 11:27am.

Technetium-99m emits only gamma radiation. Why would this type of radiation be used in diagnostic imaging rather than an isotope that also emits beta or alpha radiation?

chemistry - DrBob222, Sunday, October 7, 2012 at 4:07pm
The half life of Tc-99 is small, about 6 hours and it is excreted from the body in about a day.
chemistry - GeorgeK, Wednesday, October 10, 2012 at 6:08pm
An isotope that emits alpha and beta radiation in addition to gamma rays, would cause much more internal cellular damage, even if its half life and intensity were similar to that of Tc-99.

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