Nuclear reactor accident fallout artifacts: Unusual black spots on digital radiographs

Yasuhiro Kashimura, Koichi Chida

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


OBJECTIVE. The Fukushima nuclear power plant accident resulted in the discharge of radioactive particulate material into the atmosphere. Consequently, several hospitals in Japan have observed black spots on x-ray computed radiography (CR) images caused by particulate radioactive fallout. CONCLUSION. These black spots have no effect on human health. To reduce the influence of black spots on CR images, we need to erase latent images on imaging plates (IPs) immediately before clinical use and read the IPs soon after the x-ray examination. Alternatively, the contaminated felt of a cassette can be cleaned or exchanged, if possible.

Original languageEnglish
Pages (from-to)1240-1243
Number of pages4
JournalAmerican Journal of Roentgenology
Issue number6
Publication statusPublished - 2015 Dec


  • Black spot
  • Cesium
  • Cesium
  • Computed radiography
  • Conventional digital x-ray examination
  • Fukushima Daiichi nuclear power plant accident
  • Great East Japan Earthquake
  • Radioactive material


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