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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.

*Radiation measurement was finished on March 31st, 2016.

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)
Mar. 31, 17:00 pm 0.07
Mar. 31, 14:00 pm 0.07
Mar. 31, 10:00 am 0.07
Mar. 30, 17:00 pm 0.07
Mar. 30, 14:00 pm 0.07
Mar. 30, 10:00 am 0.07
Mar. 29, 17:00 pm 0.07
Mar. 29, 14:00 pm 0.07
Mar. 29, 10:00 am 0.07
Mar. 28, 17:00 pm 0.07
Mar. 28, 14:00 pm 0.07
Mar. 28, 10:00 am 0.07
Mar. 27, 17:00 pm 0.08
Mar. 27, 14:00 pm 0.07
Mar. 27, 10:00 am 0.07
Mar. 26, 17:00 pm 0.07
Mar. 26, 14:00 pm 0.07
Mar. 26, 10:00 am 0.07
Mar. 25, 17:00 pm 0.08
Mar. 25, 14:00 pm 0.07
Mar. 25, 10:00 am 0.07
Mar. 24, 17:00 pm 0.07
Mar. 24, 14:00 pm 0.07
Mar. 24, 10:00 am 0.07
Mar. 23, 17:00 pm 0.07
Mar. 23, 14:00 pm 0.07
Mar. 23, 10:00 am 0.08
Mar. 22, 17:00 pm 0.07
Mar. 22, 14:00 pm 0.08
Mar. 22, 10:00 am 0.07
Mar. 21, 17:00 pm 0.07
Mar. 21, 14:00 pm 0.07
Mar. 21, 10:00 am 0.07
Mar. 20, 17:00 pm 0.07
Mar. 20, 14:00 pm 0.07
Mar. 20, 10:00 am 0.07
Mar. 19, 17:00 pm 0.07
Mar. 19, 14:00 pm 0.07
Mar. 19, 10:00 am 0.08
Mar. 18, 17:00 pm 0.07
Mar. 18, 14:00 pm 0.07
Mar. 18, 10:00 am 0.08
Mar. 17, 17:00 pm 0.07
Mar. 17, 14:00 pm 0.07
Mar. 17, 10:00 am 0.07
Mar. 16, 17:00 pm 0.07
Mar. 16, 14:00 pm 0.07
Mar. 16, 10:00 am 0.07
Mar. 15, 17:00 pm 0.07
Mar. 15, 14:00 pm 0.08
Mar. 15, 10:00 am 0.07
Mar. 14, 17:00 pm 0.08
Mar. 14, 14:00 pm 0.08
Mar. 14, 10:00 am 0.08
Mar. 13, 17:00 pm 0.07
Mar. 13, 14:00 pm 0.07
Mar. 13, 10:00 am 0.07
Mar. 12, 17:00 pm 0.07
Mar. 12, 14:00 pm 0.07
Mar. 12, 10:00 am 0.07
Mar. 11, 17:00 pm 0.07
Mar. 11, 14:00 pm 0.08
Mar. 11, 10:00 am 0.07
Mar. 10, 17:00 pm 0.07
Mar. 10, 14:00 pm 0.07
Mar. 10, 10:00 am 0.07
Mar. 9, 17:00 pm 0.08
Mar. 9, 14:00 pm 0.07
Mar. 9, 10:00 am 0.07
Mar. 8, 17:00 pm 0.07
Mar. 8, 14:00 pm 0.07
Mar. 8, 10:00 am 0.07
Mar. 7, 17:00 pm 0.07
Mar. 7, 14:00 pm 0.07
Mar. 7, 10:00 am 0.07
Mar. 6, 17:00 pm 0.07
Mar. 6, 14:00 pm 0.07
Mar. 6, 10:00 am 0.07
Mar. 5, 17:00 pm 0.07
Mar. 5, 14:00 pm 0.07
Mar. 5, 10:00 am 0.07
Mar. 4, 17:00 pm 0.07
Mar. 4, 14:00 pm 0.07
Mar. 4, 10:00 am 0.07
Mar. 3, 17:00 pm 0.07
Mar. 3, 14:00 pm 0.07
Mar. 3, 10:00 am 0.07
Mar. 2, 17:00 pm 0.08
Mar. 2, 14:00 pm 0.07
Mar. 2, 10:00 am 0.07
Mar. 1, 17:00 pm 0.07
Mar. 1, 14:00 pm 0.07
Mar. 1, 10:00 am 0.07


National Institute for Materials Science (NIMS)
1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, JAPAN
TEL.+81-(0)-29-859-2000
FAX.+81-(0)-29-859-2029