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Radiation levels: Compare and Contrast

LBA Technology AM antenna systems, RF
shielding, and test equipment

Not related to radio engineering, however, I’ve been doing daily radiation measurements at my house (upstate NY) since the Fukushima disaster. A few bits of house keeping information first: This is a CD V-700 radiation meter, which is a model 6 manufactured by Anton. It was last calibrated in 1986. When I place the Geiger tube over the operational check source, it goes up to about 2 mr/hr as described in the owner’s manual. It may not be completely accurate, but it is accurate enough for this experiment.

This video was taken on March 17, 2011. It sets a good reference for normal background radiation levels:

This video was taken on March 27, 2011. It shows a significant increase in background radiation. Further, much of this appears to be gamma radiation, as the gamma shield is closed during this video:

Both of these videos were taken on the most sensitive (x1) setting. It shows that the radiation level is about 8 to 10 times above normal. It is a cause for concern, but not alarm. Not yet. If it continues at this level for several days or weeks, then the overall radiation exposure will begin to accumulate. Right now, it is about the same as taking two NY to Los Angles flights per day, according to this chart (0.35 mr/hr = 3.5 uSv per hour x 24 hours = 84 uSv per day):

Radiation chart

Radiation Chart

As of March 28, 2011, the wind has shifted more to the south west and the levels have dropped somewhat. From our beloved press corps, there have been a few reports here or there on this, most with the standard “this is nothing to worry about” disclaimer. I have also noticed a series of stories and reports that radiation is not all that bad, don’t worry about it, living next to a nuclear plant is fun(!), and we don’t know as much about radiation as we thought we did. I don’t know about all that, I’d rather base my opinion on the scientific body of evidence gathered over the last one hundred years or so. The conclusion of that information is that radiation is bad for human physiology and exposure should be limited.

There is also a crowd source website called “Radiation network,” which is showing all the levels across the US are normal. This makes me wonder about their instruments and or candor, you can draw your own conclusions.

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3 comments to Radiation levels: Compare and Contrast

  • Daniel

    While your in your basement waiting for the nuclear cloud to pass, check out all the other comics from http://www.XKCD.com (which is where that radiation chart is from). Make sure you hover your mouse over the cartoons to get an insight on what happens when a NASA engineer becomes a cartoonist.

  • Paul Thurst

    Thanks for the link Daniel, those are great

  • J. Aegerter

    The readings you are carefully watching and documenting are a valuable resource. You are quite correct in your assessment of “our beloved press corps”, as they will say anything that they are told to say to keep their jobs. It would really be great to have people in different parts of the country or world taking readings with the same instruments (carefully calibrated) to get a truthful overall picture of what actually occurs after a nuke disaster from a number of scientific individuals rather than a non-technical “lamestream media”!

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