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Radiation measurement at NIMS Sengen-site

Investigation of effect of the accident at Fukushima NPP No.1

Regarding the accident at Fukushima nuclear power plant No.1, we started to measure the intensity of radiation.

The place of monitoring, measuring method

The place of monitoring

1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047 JAPAN
(Measuring outdoors. The measuring counter is approximately 1-meter altitude from ground.)


Measuring method

Instrument: NaI scintillation counter, ALOKA TCS-172B
Dose rate: values including background level of 0.06 µSv/h


Monitoring Data

Monitoring Data at NIMS Sengen-site

µSv/h (Micro sievert/hour; 1 micro sievert = 1/1000 milli sievert)

Date Dose rate(µSv/h)
July 31, 17:00 pm 0.08
July 31, 14:00 pm 0.08
July 31, 10:00 am 0.08
July 30, 17:00 pm 0.08
July 30, 14:00 pm 0.08
July 30, 10:00 am 0.08
July 29, 17:00 pm 0.08
July 29, 14:00 pm 0.08
July 29, 10:00 am 0.08
July 28, 17:00 pm 0.08
July 28, 14:00 pm 0.08
July 28, 10:00 am 0.08
July 27, 17:00 pm 0.08
July 27, 14:00 pm 0.08
July 27, 10:00 am 0.08
July 26, 17:00 pm 0.08
July 26, 14:00 pm 0.08
July 26, 10:00 am 0.08
July 25, 17:00 pm 0.08
July 25, 14:00 pm 0.08
July 25, 10:00 am 0.08
July 24, 17:00 pm 0.08
July 24, 14:00 pm 0.07
July 24, 10:00 am 0.08
July 23, 17:00 pm 0.08
July 23, 14:00 pm 0.08
July 23, 10:00 am 0.08
July 22, 17:00 pm 0.08
July 22, 14:00 pm 0.08
July 22, 10:00 am 0.08
July 21, 17:00 pm 0.08
July 21, 14:00 pm 0.08
July 21, 10:00 am 0.08
July 20, 17:00 pm 0.08
July 20, 14:00 pm 0.08
July 20, 10:00 am 0.08
July 19, 17:00 pm 0.08
July 19, 14:00 pm 0.08
July 19, 10:00 am 0.08
July 18, 17:00 pm 0.08
July 18, 14:00 pm 0.08
July 18, 10:00 am 0.08
July 17, 17:00 pm 0.08
July 17, 14:00 pm 0.08
July 17, 10:00 am 0.08
July 16, 17:00 pm 0.09
July 16, 14:00 pm 0.08
July 16, 10:00 am 0.08
July 15, 17:00 pm 0.08
July 15, 14:00 pm 0.08
July 15, 10:00 am 0.08
July 14, 17:00 pm 0.08
July 14, 14:00 pm 0.08
July 14, 10:00 am 0.08
July 13, 17:00 pm 0.08
July 13, 14:00 pm 0.08
July 13, 10:00 am 0.08
July 12, 17:00 pm 0.08
July 12, 14:00 pm 0.08
July 12, 10:00 am 0.08
July 11, 17:00 pm 0.08
July 11, 14:00 pm 0.08
July 11, 10:00 am 0.08
July 10, 17:00 pm 0.08
July 10, 14:00 pm 0.08
July 10, 10:00 am 0.08
July 9, 17:00 pm 0.08
July 9, 14:00 pm 0.08
July 9, 10:00 am 0.08
July 8, 17:00 pm 0.08
July 8, 14:00 pm 0.08
July 8, 10:00 am 0.08
July 7, 17:00 pm 0.08
July 7, 14:00 pm 0.08
July 7, 10:00 am 0.09
July 6, 17:00 pm 0.08
July 6, 14:00 pm 0.08
July 6, 10:00 am 0.08
July 5, 17:00 pm 0.08
July 5, 14:00 pm 0.08
July 5, 10:00 am 0.08
July 4, 17:00 pm 0.08
July 4, 14:00 pm 0.09
July 4, 10:00 am 0.08
July 3, 17:00 pm 0.08
July 3, 14:00 pm 0.08
July 3, 10:00 am 0.08
July 2, 17:00 pm 0.08
July 2, 14:00 pm 0.08
July 2, 10:00 am 0.08
July 1, 17:00 pm 0.08
July 1, 14:00 pm 0.08
July 1, 10:00 am 0.08