[syhprum (OP)]

when I was a boy I rather misguidedly scraped the luminous paint from old watch dials and may have ingested some, has this ever shown up on scans that use radioactive tracers

[RD]

http://lateralscience.blogspot.com/2017/12/the-radium-water-worked-fine-until-his.html

[alancalverd]

It's a standard technique for investigating respiration, normally using krypton 85.

We made several interesting discoveries after Chernobyl: smokers are more radioactive than nonsmokers (especially in radon-affected areas) and women are more radioactive than men (not fully understood but probably due to spending more time indoors).

[RD]

... smokers are more radioactive than nonsmokers ...

Tobacco is unusually radioactive ... https://scienceblog.cancerresearchuk.org/2012/05/24/tobacco-firms-have-failed-to-act-on-radioactivity-in-cigarettes-heres-why/