- Over 1 Million Bq/kg of Radioactive Cesium from the Mysterious Black Dust in Minami Soma City (EX-SKF, Feb. 15, 2012):
Minami Soma City assemblyman Koichi Ooyama discloses the result of the test of the mysterious black dust found in locations in Minami Soma City, Fukushima Prefecture.
A blogger whom I featured before, “Night that never ends”, has been measuring radiation on the strange, black dust he finds in many locations in Minami Soma City, mostly on the road surface. His geiger counter (Inspector) measures all alpha, beta, gamma radiations and x-ray, and his measurement on the surface of this black dust was 295 microsieverts/hour.
Assemblyman Ooyama apparently sent the sample to Professor Tomoya Yamauchi of Kobe University. Professor Yamauchi did the test, and here’s the result, from Assemblyman Ooyama’s blog:
Cs-134: 485,252 Bq/kg
Cs-137: 604,360 Bq/kg
TOTAL: 1,089,612 Bq/Kg
Converting the total number to Bq/square meter,
1,089,612 × 65 = 70,824,780 Bq/m2
“Night that never ends” says in his blog this substance is very light-weight and blows off easily. He is finding it all over Minami Soma. He has asked the construction workers if it is from asphalt used in roads. The workers say no. To see the image of this black dust, go here.
“Night that never ends” says he has alerted the City Hall, and Mr. Ooyama indicates there will be a meeting with the city officials on this finding.