https://www.epa.gov/radiation/tenorm-oil-and-gas-production-wastes https://www.epa.gov/radiation/tenorm-oil-and-gas-production-... Basically there are radioacti

https://www.epa.gov/radiation/tenorm-oil-and-gas-production-wastes https://www.epa.gov/radiation/tenorm-oil-and-gas-production-... Basically there are radioactive rocks in the deposits that natural gas is stored in. Additionally there is some radioactive gas in the Gas deposits as a result of radioactive decay.