Hello @debdoc101, I would like to add my welcome along with @colleenyoung and others. While you wait for members to share their experience, I thought I would share this 2017 article that discusses radiation induced thyroid cancer in case you haven't seen it.
-- Radiation and Thyroid Cancer:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5454824/
Have you tried searching PubMed to see if you can find a related study? Here's a link that shows the search results for "childhood radiation induced thyroid cancer": https://pubmed.ncbi.nlm.nih.gov/?term=childhood+radiation+induced+thyroid+cancer&sort=date&filter=simsearch2.ffrft

Another good search engine for finding the latest medical research is Google Scholar. Here's a link with search results for the same phrase using Google Scholar: https://scholar.google.com/scholar?hl=en&as_sdt=0%2C24&as_ylo=2022&q=childhood+radiation+induced+thyroid+cancer&btnG=