What is the biggest source of radiation in an urban environment?

Question: What is the biggest source of radiation in an urban environment?
- Keywords:
  radiation
Asked by anon-270655 to Samantha, Peter on 23 Nov 2020.
- Samantha Watson answered on 23 Nov 2020:
  
  The biggest source of radiation in normal life is from radon gas in the ground. This is a natural thing, but if it comes up from the ground and gets trapped in a building can cause radiation exposure. About 50% of the average dose in the UK comes from radon gas. It is possible to monitor a building to see if it is a problem, and to put measures in place to help reduce the level of radon gas if it is a problem though.

Colin commented on 25 Nov 2020:

To add to this visit the following link

https://www.gov.uk/government/publications/ionising-radiation-dose-comparisons/ionising-radiation-dose-comparisons

I

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Question: What is the biggest source of radiation in an urban environment?