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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)
June 30, 17:00 pm 0.10
June 30, 14:00 pm 0.09
June 30, 10:00 am 0.09
June 29, 17:00 pm 0.09
June 29, 14:00 pm 0.09
June 29, 10:00 am 0.09
June 28, 17:00 pm 0.08
June 28, 14:00 pm 0.09
June 28, 10:00 am 0.09
June 27, 17:00 pm 0.09
June 27, 14:00 pm 0.08
June 27, 10:00 am 0.09
June 26, 17:00 pm 0.09
June 26, 14:00 pm 0.09
June 26, 10:00 am 0.09
June 25, 17:00 pm 0.09
June 25, 14:00 pm 0.08
June 25, 10:00 am 0.08
June 24, 17:00 pm 0.09
June 24, 14:00 pm 0.09
June 24, 10:00 am 0.09
June 23, 17:00 pm 0.08
June 23, 14:00 pm 0.09
June 23, 10:00 am 0.09
June 22, 17:00 pm 0.09
June 22, 14:00 pm 0.09
June 22, 10:00 am 0.10
June 21, 17:00 pm 0.09
June 21, 14:00 pm 0.08
June 21, 10:00 am 0.09
June 20, 17:00 pm 0.09
June 20, 14:00 pm 0.09
June 20, 10:00 am 0.09
June 19, 17:00 pm 0.09
June 19, 14:00 pm 0.09
June 19, 10:00 am 0.09
June 18, 17:00 pm 0.10
June 18, 14:00 pm 0.09
June 18, 10:00 am 0.08
June 17, 17:00 pm 0.09
June 17, 14:00 pm 0.09
June 17, 10:00 am 0.09
June 16, 17:00 pm 0.09
June 16, 14:00 pm 0.10
June 16, 10:00 am 0.09
June 15, 17:00 pm 0.09
June 15, 14:00 pm 0.09
June 15, 10:00 am 0.09
June 14, 17:00 pm 0.09
June 14, 14:00 pm 0.09
June 14, 10:00 am 0.09
June 13, 17:00 pm 0.09
June 13, 14:00 pm 0.09
June 13, 10:00 am 0.09
June 12, 17:00 pm 0.09
June 12, 14:00 pm 0.10
June 12, 10:00 am 0.09
June 11, 17:00 pm 0.09
June 11, 14:00 pm 0.09
June 11, 10:00 am 0.09
June 10, 17:00 pm 0.09
June 10, 14:00 pm 0.08
June 10, 10:00 am 0.09
June 9, 17:00 pm 0.09
June 9, 14:00 pm 0.08
June 9, 10:00 am 0.09
June 8, 17:00 pm 0.10
June 8, 14:00 pm 0.10
June 8, 10:00 am 0.09
June 7, 17:00 pm 0.10
June 7, 14:00 pm 0.10
June 7, 10:00 am 0.09
June 6, 17:00 pm 0.09
June 6, 14:00 pm 0.09
June 6, 10:00 am 0.09
June 5, 17:00 pm 0.08
June 5, 14:00 pm 0.08
June 5, 10:00 am 0.09
June 4, 17:00 pm 0.08
June 4, 14:00 pm 0.08
June 4, 10:00 am 0.09
June 3, 17:00 pm 0.09
June 3, 14:00 pm 0.09
June 3, 10:00 am 0.09
June 2, 17:00 pm 0.10
June 2, 14:00 pm 0.09
June 2, 10:00 am 0.09
June 1, 17:00 pm 0.09
June 1, 14:00 pm 0.09
June 1, 10:00 am 0.09