Radiation Increases Indoors in Japan

Friday, August 5, 2011 @ 01:08 PM gHale

Radiation dosages of 5 sieverts per hour were indoors on the second floor of the No. 1 reactor at the Fukushima Dai-ichi nuclear power plant on Tuesday, the highest figure yet indoors, plant operator Tokyo Electric Power Co. (TEPCO) said.

Officials detected the radiation in front of a pipe in an air-conditioning machine room, the utility said, adding it may be a higher dosage as the amount exceeds the capacity of measuring equipment.

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Radioactive substances are staying in the pipe after they entered there when pressure in the reactor’s containment vessel lowered on March 12, TEPCO officials said. The area is now off-limits.

TEPCO also said they detected radiation doses of more than 10 sieverts, or 10,000 millisieverts, per hour outdoors again Tuesday at the plant.

If exposed to such a high-level dosage of radiation in a short period of time, almost all people exposed would die, radiation experts said.

Tokyo Electric Power Co. worker walks on the second floor of the No. 1 reactor building at the Fukushima Dai-ichi nuclear power plant on May 9.

Tokyo Electric Power Co. worker walks on the second floor of the No. 1 reactor building at the Fukushima Dai-ichi nuclear power plant on May 9.


On Monday, TEPCO officials said they found radiation doses of as high as 10 sieverts per hour outside the buildings for the No. 1 and No. 2 reactors.

Gamma camera images which show radiation doses by color indicated red at the bottom of the main exhaust pipe between the two reactor buildings, which means radiation doses top 10 sieverts per hour, TEPCO said.

On Tuesday, more than 10 sieverts per hour were at an area near the scene, with those images also showing red at a height of 10 meters above ground on the back of the exhaust pipe.

TEPCO said radioactive substances might have adhered to the back of the exhaust pipe after the company vented at the No. 1 unit to lower pressures within the reactor pressure vessel and reactor container.

TEPCO said those places with high doses of radiation pose no major trouble for the company’s work to contain the nuclear crisis and that it has no plan to measure radiation doses in detail.



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