This is a super condensed table on how to interpret Geiger Readings. Use it to supplement your own research and getting a "block of knowledge".
If you take this radiation stuff at all seriously, then get a Geiger. All the rest is guesswork.
Radiation Alert Inspector, $530 to $600 Amazon
This table is based on the Radiation Alert Inspector which is a fine pancake tube type device. The Clicks that any device produces are based on its own "efficiency" in detecting various types of the alpha, beta, or gamma. These can then be converted to a mSv making a huge assumption, i.e. the isotope. Usually Cs is chosen for this guess. But you don't really know the mSv until you know the isotopes involved.
If you have a cheaper, small tube type Geiger, you are going to pick up less Clicks.
And Here are LIVE radiation reports from independent reporting stations.
I am sending my Radiation Alert Inspector to Japan to a family that needs real data---soooo You won't see an Oahu based reporting station until I get my next Geiger delivered.
Japan –only 2 to 5 reporting sites
Veterans Today is a great site, but sometimes they "juice it" up. http://www.veteranstoday.com/2015/04/03/your-radiation-this-week/
They report weekly max radiation readings, using sensitive EPA gamma monitors. A reader asks.....
Hi Stock. Are you able to explain the discrepancy between Bob Nichol's Your Radiation This Week and http://radiationnetwork.com/ above? - See more at: http://nukeprofessional.blogspot.com/2012/04/geiger-counter-interpretation.html?showComment=1443820247655#c7297177129227982770
Can you explain the difference between the Veterans today report and http://radiationnetwork.com/ above