Past measurement result　by Seawater Radiation Monitor near Fukushima Daiichi Nuclear Power Station

○Information

○Measurement value list ： 2026/09/12(CSV Download)

Radioactivity Concentration Unit:Bq/L

※ When being smaller then detection limit value, the numerical value is indicated with ND

Time	Cs137	Cs134	Totalβ
00:00	ND	ND	11
00:10	ND	ND	11
00:20	ND	ND	10
00:30	ND	ND	11
00:40	ND	ND	11
00:50	ND	ND	12
01:00	ND	ND	11
01:10	ND	ND	12
01:20	ND	ND	12
01:30	ND	ND	8.8
01:40	ND	ND	ND
01:50	ND	ND	ND
02:00	ND	ND	ND
02:10	ND	ND	ND
02:20	ND	ND	ND
02:30	ND	ND	11
02:40	ND	ND	14
02:50	ND	ND	14
03:00	ND	ND	16
03:10	ND	ND	12
03:20	ND	ND	14
03:30	ND	ND	12
03:40	ND	ND	12
03:50	ND	ND	12
04:00	ND	ND	9.0
04:10	ND	ND	10
04:20	ND	ND	8.9
04:30	ND	ND	9.7
04:40	ND	ND	ND
04:50	ND	ND	ND
05:00	ND	ND	ND
05:10	ND	ND	9.0
05:20	ND	ND	ND
05:30	ND	ND	ND
05:40	ND	ND	9.0
05:50	ND	ND	10
06:00	ND	ND	13
06:10	ND	ND	14
06:20	ND	ND	16
06:30	ND	ND	16
06:40	ND	ND	16
06:50	ND	ND	17
07:00	ND	ND	13
07:10	ND	ND	13
07:20	ND	ND	13
07:30	ND	ND	12
07:40	ND	ND	11
07:50	ND	ND	8.9
08:00	ND	ND	10
08:10	ND	ND	9.7
08:20	ND	ND	12
08:30	ND	ND	13
08:40	ND	ND	15
08:50	ND	ND	15
09:00	ND	ND	15
09:10	ND	ND	14
09:20	ND	ND	13
09:30	ND	ND	12
09:40	ND	ND	10
09:50	ND	ND	ND
10:00	ND	ND	12
10:10	ND	ND	15
10:20	ND	ND	14
10:30	ND	ND	15
10:40	ND	ND	15
10:50	ND	ND	17
11:00	ND	ND	14
11:10	ND	ND	14
11:20	ND	ND	15
11:30	ND	ND	14
11:40	ND	ND	12
11:50	ND	ND	13
12:00	ND	ND	11
12:10	ND	ND	10
12:20	ND	ND	9.3
12:30	ND	ND	10
12:40	ND	ND	12
12:50	ND	ND	11
13:00	ND	ND	11
13:10	ND	ND	9.9
13:20	ND	ND	8.6
13:30	ND	ND	ND
13:40	ND	ND	ND
13:50	ND	ND	9.6
14:00	ND	ND	10
14:10	ND	ND	12
14:20	ND	ND	13
14:30	ND	ND	13
14:40	ND	ND	12
14:50	ND	ND	12
15:00	ND	ND	13
15:10	ND	ND	13
15:20	ND	ND	11
15:30	ND	ND	12
15:40	ND	ND	13
15:50	ND	ND	14
16:00	ND	ND	14
16:10	ND	ND	13
16:20	ND	ND	14
16:30	ND	ND	13
16:40	ND	ND	12
16:50	ND	ND	12
17:00	ND	ND	10
17:10	ND	ND	9.6
17:20	ND	ND	ND
17:30	ND	ND	9.0
17:40	ND	ND	9.6
17:50	ND	ND	8.9
18:00	ND	ND	ND
18:10	ND	ND	9.3
18:20	ND	ND	11
18:30	ND	ND	10
18:40	ND	ND	ND
18:50	ND	ND	ND
19:00	ND	ND	ND
19:10	ND	ND	8.4
19:20	ND	ND	ND
19:30	ND	ND	ND
19:40	ND	ND	ND
19:50	ND	ND	ND
20:00	ND	ND	ND
20:10	ND	ND	ND
20:20	ND	ND	ND
20:30	ND	ND	ND
20:40	ND	ND	ND
20:50	ND	ND	8.6
21:00	ND	ND	10
21:10	ND	ND	9.6
21:20	ND	ND	10
21:30	ND	ND	12
21:40	ND	ND	14
21:50	ND	ND	14
22:00	ND	ND	15
22:10	ND	ND	16
22:20	ND	ND	14
22:30	ND	ND	14
22:40	ND	ND	11
22:50	ND	ND	11
23:00	ND	ND	13
23:10	ND	ND	13
23:20	ND	ND	11
23:30	ND	ND	9.9
23:40	ND	ND	12
23:50	ND	ND	9.3

Past measurement result by Seawater Radiation Monitor near Fukushima Daiichi Nuclear Power Station

Past measurement result　by Seawater Radiation Monitor near Fukushima Daiichi Nuclear Power Station