Japanese gov admitted monitored radiation level is indicated to be 10% lower than actual. Fukushima Diary Mochizuki on November 7th, 2012 http://fukushima-diary.com/2012/11/japanese-gov-admitted-monitored-radiation-level-is-indicated-to-be-10-lower-than-actual/
[Excerpted] On 11/7/2012, nuclear accident responde headquarters admitted the monitoring posts located in and around Fukushima prefecture indicate radiation level 10% lower than actual.
They explain it is due to the battery beside the monitoring machine to shield radiation. They are going to rebuild 675 monitoring posts.
Ex-SKF Wednesday, November 7, 2012 Japanese Government Now Admits 675 Radiation Monitoring Posts Show "10% Lower" Than Actual Levels, "Beyond Expectation" Says Ministry of Education
[excerpted] Why 10% lower? Because the led battery was shielding the radiation detector.
Majia here: This is not the first instance of evidence and/or allegations of tampering with radiation readings:
Former Minister for Internal Affairs Haraguchi Kazuhiro has alleged that radiation monitoring station data was actually three decimal places greater than the numbers released to the public. If this is true, it constitutes a “national crime”, in Nishio’s words. He follows with, “Giving us the truth once is much more important than saying ‘hang in there Japan!’ a million times.” (cited in Matthew Penney Jul. 01, 2011. Japanese Cancer Expert on the Fukushima Situation http://japanfocus.org/events/view/100)