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By Peter Daley, (Sample tested on the 29th March 2013)
I was sent this resin encapsulated sample of black fungus like material. It has reportedly come from somewhere in the Minamisoma area Japan. A contact in Japan sent a friend this sample. This is my test chart of it. For those of you who have not looked at a chart like this before. The position of the peaks in a the chart indicate what isotopes are present. This fungus started growing on the concrete, and rock surfaces in Japan after the Fukushima Nuclear disaster. It appears to be bio-accumulating Cesium.
Scintillators are less sensitive as you go to higher energy keV. The Theremino MCA software allows you to increase the magnification of the higher energy peaks. The peaks in this Theremino MCA V4.5 software chart have been energy compensated, to bring out the smaller details at higher energies. The sample very small, grams or less.
A professional lab reported test results 117 Bg Cs-137 and 58 Bq Cs-134. This black fungus material sample from Japan, contaminated with Cesium Cs-137 & Cs-134, is encapsulated in resin for safety reasons. So we don't know how much it weighs. We are trying to find out. It may not have been weighed when it was collected. Visually, looking at the encased sample, it would be a few grams if that.
Here is a pen tip placed next to the sample, to give you and idea how small the sample is. The black center is the sample. Also, the sample does not fill up the small sample container, that is in the center of the resin encasement. The sample container is only around two thirds full.
Update on the possible weight of the Black Fungus sample from Japan. This comment was posted on a forum discussing this test.
"I'm an expert on weighing objects (sell scales, use different ones daily, some precise to .01g). Fungus in that form does not appear to hold too much water weight and would likely weigh less than a gram given the scale. If it jis thin and flakey type fungus, it may be under .25-.5g. Is it thick like a mushroom cap or more like lichen? I've only observed extremely thin fungi growing on concrete, and I would err on the very low side. My best guess is .3g."
That means the black fungus sample from Japan is very, very, hot.
Test results 117 Bg Cs-137 and 58 Bq Cs-134
117 + 58 = 175 Bq x (1000 grams/0.3 grams) = 583,333 Bq/Kg of Cesium
Even if it was 10 times greater in weight 3 grams, it would still be 58,333 Bq/Kg of Cesium.
The person who supplied this sample to me, went to a lot of trouble and expense, to make this sample available to researches in Australia. I would like to thank him for that. Any comments or suggestions, regarding the results of this test chart results are welcome. There is no copyright placed on the chart screen shot, so you can copy it, and make use of it where ever you like.
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