There is NO NEED to take potasium iodide pills (KI) It is not necessary, not appropriate and is not safe!!! These pills are only used at the site of the accident. Also, people can overdose on these and they can be dangerous for pregnant women.
Do not worry! Nothing has been detected and there is no expectation of an contamination here.
Use this link for more information concerning the Japan nuclear issue and how it will not affect Oregon.
There are monitoring stations throughout the country.