Fukushima radiation hits San Francisco

http://topinfopost.com/2013/12/26/fukushima-radiation-hits-san-francisco

A good comment on this:

"I'm sick of these Fukushima alarmist websites. Notice how none of them are ever written by actual radiological scientists or published by reputable non-governmental organizations, and none of them even bother to add any meaningful scientific context to their "findings". Let's take this guy's measurements, which he says average 150CPM and which peaks out at 156CPM at one point in the video. If you take the highest measurement of 156CPM and divided it by the specified 3500CPM/mR/h sensitivity level of his model Geiger meter, you get a measurement of 0.04458 mR/h (milliroentgens per hour). Multiply this value by 8766 hours per year to get 391 mR per year, then multiply that by 0.96 to convert to the roentgen equivalent in man (rem) value of 375 mrem--this is the level of radiation deposited in soft biological tissue. According to MIT, the average natural background radiation at sea level is 300 mrem. This increases at higher elevation where Denver has an average 400 mrem. Federal safety standards for fetuses and minors in workplace environment label 500 mrem, or 5000 mrem for adults, as the upper limit of safe. To give further context, acute radiation poisoning is defined as over 1 sievert or 100 rem (100,000 mrem) in a short time period, which at the rate of peak measurement level would take over 25 years to accumulate. Another way to look at that is, at 0.0428 rem/h or 0.0007 rem/m, that is over 142,857 times the peak measurement registered on Pacifica State Beach."