interesting story
1 - What happens if a radioactive source remains lost?
The search for the lost capsule in WA triggered an immediate and highly publicised search, but not all responses are as rigorous.
2 - In the 1970s, a small radioactive capsule with a caesium-137 source — originally part of a radiation level gauge — was lost in the Karansky quarry in Soviet Ukraine's Donetsk region.
3- The search for the capsule was eventually abandoned and the gravel from the quarry was used in the construction of an apartment building in Kramatorsk.
In 1981, a year after construction, an 18-year-old girl who lived in apartment number 85 died of leukaemia.
4 - A year later, her 16-year-old brother died of the same illness, followed by their mother.
Doctors believed the three deaths were a result of some genetic predisposition, but when a new family moved into the apartment and their son also died of leukaemia,
5 - his father pushed for an investigation.
Specialists arrived at the apartment with a dosimeter and discovered sky-high radiation levels.
A powerful gamma radiation was coming from the wall where, after further testing,
authorities found the capsule containing caesium-137.
6 - Dr Kempson said this source may have been more potent than the capsule lost in WA. -
END
source
https://www.abc.net.au/news/science/2023-02-03/radioactive-capsule-western-australia-wa-what-is-the-risk/101911004