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Severe burns of worker's right hands during X-ray inspection

Chronological order (News from Mainichi;000731, and Yomiuri;000731)

1)00-06-middle; The three workers, aged 19, 26 and 29, received serious burns to their right hands while examining electronic parts at Taihei Electronics Co.
2)00-07-beginning; At the beginning of last month, their right hands became inflamed and the three workers underwent medical checks at a nearby hospital.
3)00-07-05; They were diagnosed as suffering from radioactive burns at the National Institute of Radiological Sciences and were hospitalized there for several days.
4)00-07-31; Accident were reported by mass-media.

[Cause]
The workers were checking for defective products by scanning integrated circuit chips with X-rays in a hermetically sealed box. During radiographic testing, workers are supposed to stop transmission of the X-rays before opening a hatch to change the position of the product. But the three workers intentionally omitted to do this, for speedy operation.

[Effects]
Three men were exposed 50-100 sirverts on right hands. These exposures were local of body, and not fatal for their lives. But for their hands, it will have severe effects.