Mystery: Radioactive black substance reported 25km from Fukushima — Latest measurement over 95 µSv/h — Strong alpha emitter detected (PHOTOS)

Published: February 12th, 2012 at 9:22 pm ET
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SOURCE: ameba.jp

Paraphrased translation provided by N.K., a concerned citizen in Japan

What follows is a summary of a series blog posts about mysterious radioactive black materials found in and around Minami-Soma City, Fukushima Prefecture, about 25km from the plant.

Black materials looking like sand or powder were found in the Haramachi-ku area of Minami-Soma City.

A similar substance was also found in nearby Soma City.

The materials can reportedly be found many places in Minami-Soma city and Soma city areas.

Here are several recent measurements:

Jan. 27: Measured values in Haramachi-ku using the Inspector +

  • 901 cpm: gamma ray only, with WT Plate, 1cm above GND
  • 13,380 cpm: gamma + beta + alpha, without WTP, 1cm above GND
  • 10,330 cpm: gamma + beta + alpha, with XEROX paper, 1cm above GND

This means that XEROX paper cuts off 3,050 cpm alpha-ray, so the quite strong alpha-ray is radiated from the materials.

Feb. 4: The materials could not be found at Fukushima City
, 60km from the plant. Only gamma-ray were strong.

Feb. 6: Normal sand in the area mainly contains Cs134 and Cs137

  • Gamma-ray: 959 cpm
  • Gamma + beta + alpha: 2,146 cpm

Feb. 6: Black material in sand

  • gamma-ray: 3,274 cpm
  • gamma + beta + alpha: 18,370 cpm

Radiation of the black materials were very strong when compared to the normal-colored sand. The materials have unbelievable beta + alpha.

Feb. 9: Piece of paper cuts shields 7,230 cpm

  • gamma + beta + alpha: 31,680 cpm, without the paper
  • gamma + beta + alpha: 24,450 cpm, with the paper

TERRA MKS-05 measures only gamma and beta-ray, XEROX paper did not make much difference

  • 11.53 micro S/h: gamma-ray only, without paper
  • 17.56 micro S/h: gamma + beta, without paper
  • 16.98 micro S/h: gamma + beta, with paper

Feb. 11: Latest measurement of the black materials

95.40 micro S/h: gamma + beta + alpha

See more photos by following the links above

Published: February 12th, 2012 at 9:22 pm ET
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19 comments

Related Posts

  1. UPDATE: Original mystery black substance was never tested — Much more radioactive than official’s black dust — Detector shows 95,880 cpm — Up to 60,000 cpm in beta — New alpha info February 17, 2012
  2. HCR: Mystery black radioactive powder detected outside school — Local official posts 3 videos of black substance (PHOTO & VIDEOS) February 24, 2012
  3. Mystery black substance has 1,000,000+ Bq/kg of cesium — Seen all over Minami Soma — Officials meeting to discuss findings February 16, 2012
  4. Mystery Continues: Original 295 microSv/h black substance remains untested — Locals getting suspicious? February 19, 2012
  5. Strange: Pieces of highly radioactive mystery black substance cling to magnet (VIDEO) March 20, 2012

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