Why/how does it concentrate in truffles?

Could truffles be used to extract the radioactivity from the environment?

The paper the article references

https://pubs.acs.org/doi/full/10.1021/acs.est.3c03565

However, the release of radionuclides into the environment from nuclear accidents or nuclear weapons fallout poses potential threats to public health and societies and economic activities as some radionuclides are capable of persistently contaminating the food chain, resulting in widespread and long-term risk of radiation exposure

Would be interested to see how that compares to coal