Sheldon decides to build a in the shed after getting inspired by a book about a "radioactive boy scout" who tried to build a breeder reactor. He needs a neutron source, so he tries to get radioactive material from household items (smoke detectors, etc.). His father, George Sr., initially supports his "science project" until he realizes Sheldon is actually attempting something dangerous involving radioactive isotopes.
It sounds like you're looking for the summary or details for Young Sheldon Season 2, Episode 19, possibly from a WEBrip source. young sheldon s02e19 webrip
If you meant you have a WEBrip file with a or need subtitles for that specific release, let me know and I can help further. Sheldon decides to build a in the shed
S02E19 Title: "A Nuclear Reactor and a Boy Called Lovey" Original Air Date: April 4, 2019 It sounds like you're looking for the summary