The estimated overall maximum biological effect from the trace amounts of radiation detected in Oregon during the recent events in Japan is about 0.000160 mrem per day. To put this into perspective, a person would need to be exposed to this level all day, everyday for over 100 years to equal the exposure from ONE chest X-ray. This data is updated once a month.
Air samples are collected and analyzed twice a week, before being sent to the EPA. Data is updated on the website once a month.
Sample End Date
|Cesium - 137
||Iodine - 131|
*Minimum Detectable Activity
Picocurie (pCi): A unit of measurement that corresponds to the rate of decay of a sample of radioactive material. 1 pCi = 0.037 Becquerel (Bq) = 2.22 disintegrations/minute