NEI expert Janet Schlueter discusses natural, safe forms of radiation and monitoring.
For more radiation answers, visit the most logical site for them – Radiation Answers. This is a terrific site. It doesn’t sugar coat the subject, but it does provide a needed perspective. It’s a friendly way to get into a big – and very relevant – topic.
Speaking of perspective, NEI has a fact sheet called Radiation in Perspective that provides a lot of good information in an easy to understand way. See here for that.
Here’s a bit from the fact sheet that relates to events at Fukushima Daiichi:
Releases to the environment associated with venting consist primarily of radioactive noble gases which, by their chemical and physical nature, disperse in the atmosphere and provide a source of radiation exposure in a passing plume or vapor cloud. The current conditions at the Fukushima Daiichi plant may result in a reduced effectiveness in trapping the radioactive cesium and iodine in the suppression pool. Therefore, the releases may contain higher levels of radioactive cesium and iodine, which provide sources of exposure from inhalation and ingestion.
This piece has been updated to include information useful for those following news reports and wanting to know more and may be updated again, so do check the page occasionally for updates.