Radiation doses in the air / Measurement results by the hour (Edogawa)

We continuously measure radiation doses in the air (air absorbed doses per hour) at monitoring posts. Measurement results can be obtained by the minute, and we gather measurement data and then display them by the hour or by the day.

The maximum value indicates the largest value measured in each time slot (during the hour or during the day), the minimum value the smallest value measured in each time slot, and the average value is the average value for each time slot.

【News about this monitoring post】

We will suspend the provision of data in part or whole of the following time slots by interruption of power supply and relevant facilities due to maintenance and inspection of equipment.

From 10:00 to 13:00 on Tuesday, February 6,2018 Hachioji
From 13:00 to 16:00 on Tuesday, February 6,2018 Kodaira
From 10:00 to 13:00 on Wednesday, February 7,2018 Chofu
From 13:00 to 16:00 on Wednesday, February 7,2018 Ota
From 10:00 to 13:00 on Thursday, February 8,2018 Adachi
From 13:00 to 16:00 on Thursday, February 8,2018 Edogawa
From 10:00 to 13:00 on Friday, February 9,2018 Shinjuku







Shown in µGy/h (microgray per hour)

Gray indicates an amount of energy (absorbed dose) when radiation hits a material object, and 1 gray (Gy) of radiation doses in the air can be converted to 1 sievert (Sv).

Measurement time Dose rate
μGy/h (microgray per hour)
Maximum value Minimum value Average value
13:01-14:00, Tue., 20 Feb. 0.0554 0.0495 0.0523
12:01-13:00, Tue., 20 Feb. 0.0557 0.0494 0.0520
11:01-12:00, Tue., 20 Feb. 0.0561 0.0494 0.0521
10:01-11:00, Tue., 20 Feb. 0.0549 0.0491 0.0523
09:01-10:00, Tue., 20 Feb. 0.0545 0.0477 0.0516
08:01-09:00, Tue., 20 Feb. 0.0562 0.0474 0.0513
07:01-08:00, Tue., 20 Feb. 0.0539 0.0485 0.0513
06:01-07:00, Tue., 20 Feb. 0.0557 0.0483 0.0513
05:01-06:00, Tue., 20 Feb. 0.0564 0.0478 0.0516
04:01-05:00, Tue., 20 Feb. 0.0556 0.0481 0.0515
03:01-04:00, Tue., 20 Feb. 0.0542 0.0483 0.0516
02:01-03:00, Tue., 20 Feb. 0.0555 0.0483 0.0518
01:01-02:00, Tue., 20 Feb. 0.0541 0.0478 0.0513
00:01-01:00, Tue., 20 Feb. 0.0552 0.0485 0.0519
23:01-24:00, Mon., 19 Feb. 0.0542 0.0486 0.0514
22:01-23:00, Mon., 19 Feb. 0.0547 0.0484 0.0513
21:01-22:00, Mon., 19 Feb. 0.0546 0.0486 0.0515
20:01-21:00, Mon., 19 Feb. 0.0556 0.0484 0.0515
19:01-20:00, Mon., 19 Feb. 0.0539 0.0477 0.0511
18:01-19:00, Mon., 19 Feb. 0.0546 0.0486 0.0515
17:01-18:00, Mon., 19 Feb. 0.0548 0.0480 0.0514
16:01-17:00, Mon., 19 Feb. 0.0549 0.0480 0.0515
15:01-16:00, Mon., 19 Feb. 0.0540 0.0486 0.0509
14:01-15:00, Mon., 19 Feb. 0.0546 0.0483 0.0515
13:01-14:00, Mon., 19 Feb. 0.0548 0.0483 0.0517
12:01-13:00, Mon., 19 Feb. 0.0555 0.0487 0.0521
11:01-12:00, Mon., 19 Feb. 0.0562 0.0483 0.0521
10:01-11:00, Mon., 19 Feb. 0.0567 0.0488 0.0519
09:01-10:00, Mon., 19 Feb. 0.0557 0.0481 0.0512
08:01-09:00, Mon., 19 Feb. 0.0539 0.0483 0.0510
07:01-08:00, Mon., 19 Feb. 0.0537 0.0486 0.0506
06:01-07:00, Mon., 19 Feb. 0.0541 0.0472 0.0506
05:01-06:00, Mon., 19 Feb. 0.0538 0.0480 0.0509
04:01-05:00, Mon., 19 Feb. 0.0544 0.0471 0.0506
03:01-04:00, Mon., 19 Feb. 0.0544 0.0468 0.0508
02:01-03:00, Mon., 19 Feb. 0.0539 0.0480 0.0509
01:01-02:00, Mon., 19 Feb. 0.0542 0.0462 0.0504
00:01-01:00, Mon., 19 Feb. 0.0548 0.0478 0.0512
23:01-24:00, Sun., 18 Feb. 0.0545 0.0471 0.0507
22:01-23:00, Sun., 18 Feb. 0.0537 0.0462 0.0505
21:01-22:00, Sun., 18 Feb. 0.0537 0.0478 0.0506
20:01-21:00, Sun., 18 Feb. 0.0531 0.0477 0.0504
19:01-20:00, Sun., 18 Feb. 0.0541 0.0467 0.0505
18:01-19:00, Sun., 18 Feb. 0.0537 0.0462 0.0507
17:01-18:00, Sun., 18 Feb. 0.0547 0.0466 0.0505
16:01-17:00, Sun., 18 Feb. 0.0535 0.0480 0.0508
15:01-16:00, Sun., 18 Feb. 0.0546 0.0481 0.0506
14:01-15:00, Sun., 18 Feb. 0.0545 0.0479 0.0508
13:01-14:00, Sun., 18 Feb. 0.0536 0.0470 0.0508
12:01-13:00, Sun., 18 Feb. 0.0540 0.0474 0.0510
11:01-12:00, Sun., 18 Feb. 0.0546 0.0481 0.0512
10:01-11:00, Sun., 18 Feb. 0.0543 0.0483 0.0510
09:01-10:00, Sun., 18 Feb. 0.0530 0.0470 0.0505
08:01-09:00, Sun., 18 Feb. 0.0526 0.0482 0.0504
07:01-08:00, Sun., 18 Feb. 0.0539 0.0477 0.0506
06:01-07:00, Sun., 18 Feb. 0.0531 0.0480 0.0506
05:01-06:00, Sun., 18 Feb. 0.0527 0.0483 0.0505
04:01-05:00, Sun., 18 Feb. 0.0540 0.0480 0.0507
03:01-04:00, Sun., 18 Feb. 0.0543 0.0472 0.0506
02:01-03:00, Sun., 18 Feb. 0.0543 0.0483 0.0508
01:01-02:00, Sun., 18 Feb. 0.0540 0.0470 0.0512
00:01-01:00, Sun., 18 Feb. 0.0536 0.0476 0.0507
23:01-24:00, Sat., 17 Feb. 0.0544 0.0482 0.0511
22:01-23:00, Sat., 17 Feb. 0.0543 0.0479 0.0510
21:01-22:00, Sat., 17 Feb. 0.0549 0.0474 0.0511
20:01-21:00, Sat., 17 Feb. 0.0546 0.0469 0.0513
19:01-20:00, Sat., 17 Feb. 0.0558 0.0483 0.0517
18:01-19:00, Sat., 17 Feb. 0.0543 0.0486 0.0517
17:01-18:00, Sat., 17 Feb. 0.0563 0.0485 0.0517
16:01-17:00, Sat., 17 Feb. 0.0557 0.0488 0.0520
15:01-16:00, Sat., 17 Feb. 0.0564 0.0494 0.0525
14:01-15:00, Sat., 17 Feb. 0.0568 0.0488 0.0527
13:01-14:00, Sat., 17 Feb. 0.0552 0.0495 0.0518
12:01-13:00, Sat., 17 Feb. 0.0556 0.0481 0.0515
11:01-12:00, Sat., 17 Feb. 0.0547 0.0488 0.0514
10:01-11:00, Sat., 17 Feb. 0.0546 0.0473 0.0512
09:01-10:00, Sat., 17 Feb. 0.0542 0.0481 0.0509
08:01-09:00, Sat., 17 Feb. 0.0537 0.0468 0.0507
07:01-08:00, Sat., 17 Feb. 0.0533 0.0459 0.0504
06:01-07:00, Sat., 17 Feb. 0.0537 0.0464 0.0504
05:01-06:00, Sat., 17 Feb. 0.0536 0.0479 0.0511
04:01-05:00, Sat., 17 Feb. 0.0542 0.0479 0.0506
03:01-04:00, Sat., 17 Feb. 0.0537 0.0474 0.0507
02:01-03:00, Sat., 17 Feb. 0.0549 0.0465 0.0509
01:01-02:00, Sat., 17 Feb. 0.0538 0.0473 0.0505
00:01-01:00, Sat., 17 Feb. 0.0548 0.0461 0.0507
23:01-24:00, Fri., 16 Feb. 0.0547 0.0478 0.0508
22:01-23:00, Fri., 16 Feb. 0.0541 0.0467 0.0504
21:01-22:00, Fri., 16 Feb. 0.0538 0.0475 0.0507
20:01-21:00, Fri., 16 Feb. 0.0525 0.0479 0.0505
19:01-20:00, Fri., 16 Feb. 0.0541 0.0477 0.0508
18:01-19:00, Fri., 16 Feb. 0.0545 0.0459 0.0505
17:01-18:00, Fri., 16 Feb. 0.0544 0.0456 0.0505
16:01-17:00, Fri., 16 Feb. 0.0542 0.0485 0.0510
15:01-16:00, Fri., 16 Feb. 0.0537 0.0472 0.0509
14:01-15:00, Fri., 16 Feb. 0.0541 0.0487 0.0512
13:01-14:00, Fri., 16 Feb. 0.0547 0.0476 0.0512
12:01-13:00, Fri., 16 Feb. 0.0559 0.0476 0.0515
11:01-12:00, Fri., 16 Feb. 0.0558 0.0474 0.0517
10:01-11:00, Fri., 16 Feb. 0.0553 0.0480 0.0512
09:01-10:00, Fri., 16 Feb. 0.0559 0.0472 0.0512
08:01-09:00, Fri., 16 Feb. 0.0549 0.0474 0.0508
07:01-08:00, Fri., 16 Feb. 0.0549 0.0472 0.0503
06:01-07:00, Fri., 16 Feb. 0.0534 0.0476 0.0502
05:01-06:00, Fri., 16 Feb. 0.0539 0.0459 0.0503
04:01-05:00, Fri., 16 Feb. 0.0545 0.0469 0.0506
03:01-04:00, Fri., 16 Feb. 0.0543 0.0478 0.0506
02:01-03:00, Fri., 16 Feb. 0.0536 0.0482 0.0510
01:01-02:00, Fri., 16 Feb. 0.0533 0.0471 0.0507
00:01-01:00, Fri., 16 Feb. 0.0542 0.0482 0.0508
23:01-24:00, Thu., 15 Feb. 0.0558 0.0478 0.0509
22:01-23:00, Thu., 15 Feb. 0.0541 0.0479 0.0507
21:01-22:00, Thu., 15 Feb. 0.0548 0.0476 0.0510
20:01-21:00, Thu., 15 Feb. 0.0556 0.0473 0.0507
19:01-20:00, Thu., 15 Feb. 0.0545 0.0459 0.0508
18:01-19:00, Thu., 15 Feb. 0.0564 0.0465 0.0508
17:01-18:00, Thu., 15 Feb. 0.0545 0.0485 0.0512
16:01-17:00, Thu., 15 Feb. 0.0548 0.0470 0.0515
15:01-16:00, Thu., 15 Feb. 0.0551 0.0485 0.0519
14:01-15:00, Thu., 15 Feb. 0.0551 0.0483 0.0520
13:01-14:00, Thu., 15 Feb. 0.0558 0.0491 0.0520
12:01-13:00, Thu., 15 Feb. 0.0557 0.0475 0.0520
11:01-12:00, Thu., 15 Feb. 0.0560 0.0481 0.0521
10:01-11:00, Thu., 15 Feb. 0.0547 0.0481 0.0520
09:01-10:00, Thu., 15 Feb. 0.0540 0.0481 0.0509
08:01-09:00, Thu., 15 Feb. 0.0550 0.0479 0.0512
07:01-08:00, Thu., 15 Feb. 0.0539 0.0475 0.0509
06:01-07:00, Thu., 15 Feb. 0.0541 0.0474 0.0511
05:01-06:00, Thu., 15 Feb. 0.0542 0.0480 0.0511
04:01-05:00, Thu., 15 Feb. 0.0547 0.0470 0.0510
03:01-04:00, Thu., 15 Feb. 0.0555 0.0476 0.0511
02:01-03:00, Thu., 15 Feb. 0.0540 0.0480 0.0509
01:01-02:00, Thu., 15 Feb. 0.0537 0.0482 0.0509
00:01-01:00, Thu., 15 Feb. 0.0551 0.0471 0.0507
23:01-24:00, Wed., 14 Feb. 0.0535 0.0475 0.0504
22:01-23:00, Wed., 14 Feb. 0.0532 0.0469 0.0506
21:01-22:00, Wed., 14 Feb. 0.0539 0.0479 0.0506
20:01-21:00, Wed., 14 Feb. 0.0531 0.0469 0.0500
19:01-20:00, Wed., 14 Feb. 0.0533 0.0471 0.0504
18:01-19:00, Wed., 14 Feb. 0.0555 0.0477 0.0503
17:01-18:00, Wed., 14 Feb. 0.0530 0.0466 0.0506
16:01-17:00, Wed., 14 Feb. 0.0546 0.0482 0.0509
15:01-16:00, Wed., 14 Feb. 0.0554 0.0477 0.0513
14:01-15:00, Wed., 14 Feb. 0.0537 0.0484 0.0511
13:01-14:00, Wed., 14 Feb. 0.0561 0.0479 0.0513
12:01-13:00, Wed., 14 Feb. 0.0559 0.0465 0.0513
11:01-12:00, Wed., 14 Feb. 0.0543 0.0480 0.0509
10:01-11:00, Wed., 14 Feb. 0.0543 0.0481 0.0511
09:01-10:00, Wed., 14 Feb. 0.0546 0.0469 0.0505
08:01-09:00, Wed., 14 Feb. 0.0544 0.0482 0.0509
07:01-08:00, Wed., 14 Feb. 0.0536 0.0475 0.0505
06:01-07:00, Wed., 14 Feb. 0.0533 0.0467 0.0502
05:01-06:00, Wed., 14 Feb. 0.0536 0.0479 0.0506
04:01-05:00, Wed., 14 Feb. 0.0542 0.0467 0.0505
03:01-04:00, Wed., 14 Feb. 0.0534 0.0476 0.0506
02:01-03:00, Wed., 14 Feb. 0.0541 0.0472 0.0504
01:01-02:00, Wed., 14 Feb. 0.0546 0.0476 0.0505
00:01-01:00, Wed., 14 Feb. 0.0532 0.0479 0.0502
23:01-24:00, Tue., 13 Feb. 0.0531 0.0470 0.0502
22:01-23:00, Tue., 13 Feb. 0.0530 0.0464 0.0502
21:01-22:00, Tue., 13 Feb. 0.0536 0.0474 0.0501
20:01-21:00, Tue., 13 Feb. 0.0522 0.0474 0.0500
19:01-20:00, Tue., 13 Feb. 0.0543 0.0469 0.0504
18:01-19:00, Tue., 13 Feb. 0.0565 0.0480 0.0506
17:01-18:00, Tue., 13 Feb. 0.0537 0.0477 0.0509
16:01-17:00, Tue., 13 Feb. 0.0539 0.0479 0.0510
15:01-16:00, Tue., 13 Feb. 0.0543 0.0474 0.0511
14:01-15:00, Tue., 13 Feb. 0.0543 0.0477 0.0509
13:01-14:00, Tue., 13 Feb. 0.0557 0.0479 0.0509
12:01-13:00, Tue., 13 Feb. 0.0543 0.0483 0.0511
11:01-12:00, Tue., 13 Feb. 0.0553 0.0486 0.0515
10:01-11:00, Tue., 13 Feb. 0.0544 0.0486 0.0512
09:01-10:00, Tue., 13 Feb. 0.0541 0.0473 0.0506
08:01-09:00, Tue., 13 Feb. 0.0531 0.0466 0.0500
07:01-08:00, Tue., 13 Feb. 0.0537 0.0474 0.0503
06:01-07:00, Tue., 13 Feb. 0.0543 0.0466 0.0503
05:01-06:00, Tue., 13 Feb. 0.0529 0.0459 0.0499
04:01-05:00, Tue., 13 Feb. 0.0536 0.0469 0.0503
03:01-04:00, Tue., 13 Feb. 0.0538 0.0470 0.0501
02:01-03:00, Tue., 13 Feb. 0.0535 0.0477 0.0503
01:01-02:00, Tue., 13 Feb. 0.0525 0.0462 0.0498
00:01-01:00, Tue., 13 Feb. 0.0528 0.0466 0.0502
23:01-24:00, Mon., 12 Feb. 0.0538 0.0467 0.0504
22:01-23:00, Mon., 12 Feb. 0.0533 0.0471 0.0504
21:01-22:00, Mon., 12 Feb. 0.0527 0.0458 0.0504
20:01-21:00, Mon., 12 Feb. 0.0530 0.0472 0.0502
19:01-20:00, Mon., 12 Feb. 0.0532 0.0476 0.0503
18:01-19:00, Mon., 12 Feb. 0.0548 0.0465 0.0503
17:01-18:00, Mon., 12 Feb. 0.0540 0.0469 0.0505
16:01-17:00, Mon., 12 Feb. 0.0545 0.0479 0.0506
15:01-16:00, Mon., 12 Feb. 0.0544 0.0484 0.0508
14:01-15:00, Mon., 12 Feb. 0.0550 0.0473 0.0509
13:01-14:00, Mon., 12 Feb. 0.0542 0.0482 0.0512
12:01-13:00, Mon., 12 Feb. 0.0533 0.0475 0.0508
11:01-12:00, Mon., 12 Feb. 0.0549 0.0471 0.0508
10:01-11:00, Mon., 12 Feb. 0.0544 0.0477 0.0507
09:01-10:00, Mon., 12 Feb. 0.0527 0.0464 0.0500
08:01-09:00, Mon., 12 Feb. 0.0535 0.0453 0.0497
07:01-08:00, Mon., 12 Feb. 0.0529 0.0469 0.0499
06:01-07:00, Mon., 12 Feb. 0.0522 0.0468 0.0497
05:01-06:00, Mon., 12 Feb. 0.0528 0.0472 0.0501
04:01-05:00, Mon., 12 Feb. 0.0527 0.0469 0.0501
03:01-04:00, Mon., 12 Feb. 0.0538 0.0462 0.0499
02:01-03:00, Mon., 12 Feb. 0.0532 0.0461 0.0501
01:01-02:00, Mon., 12 Feb. 0.0533 0.0476 0.0503
00:01-01:00, Mon., 12 Feb. 0.0552 0.0466 0.0500
23:01-24:00, Sun., 11 Feb. 0.0530 0.0457 0.0501
22:01-23:00, Sun., 11 Feb. 0.0530 0.0477 0.0503
21:01-22:00, Sun., 11 Feb. 0.0526 0.0469 0.0503
20:01-21:00, Sun., 11 Feb. 0.0538 0.0472 0.0502
19:01-20:00, Sun., 11 Feb. 0.0549 0.0468 0.0502
18:01-19:00, Sun., 11 Feb. 0.0544 0.0479 0.0503
17:01-18:00, Sun., 11 Feb. 0.0533 0.0476 0.0504
16:01-17:00, Sun., 11 Feb. 0.0531 0.0480 0.0507
15:01-16:00, Sun., 11 Feb. 0.0553 0.0484 0.0510
14:01-15:00, Sun., 11 Feb. 0.0540 0.0485 0.0515
13:01-14:00, Sun., 11 Feb. 0.0556 0.0480 0.0510
12:01-13:00, Sun., 11 Feb. 0.0540 0.0481 0.0512
11:01-12:00, Sun., 11 Feb. 0.0546 0.0475 0.0512
10:01-11:00, Sun., 11 Feb. 0.0546 0.0479 0.0511
09:01-10:00, Sun., 11 Feb. 0.0537 0.0464 0.0509
08:01-09:00, Sun., 11 Feb. 0.0539 0.0485 0.0509
07:01-08:00, Sun., 11 Feb. 0.0546 0.0481 0.0511
06:01-07:00, Sun., 11 Feb. 0.0542 0.0477 0.0509
05:01-06:00, Sun., 11 Feb. 0.0535 0.0485 0.0509
04:01-05:00, Sun., 11 Feb. 0.0556 0.0477 0.0508
03:01-04:00, Sun., 11 Feb. 0.0554 0.0482 0.0513
02:01-03:00, Sun., 11 Feb. 0.0531 0.0482 0.0506
01:01-02:00, Sun., 11 Feb. 0.0528 0.0477 0.0505
00:01-01:00, Sun., 11 Feb. 0.0530 0.0475 0.0502
23:01-24:00, Sat., 10 Feb. 0.0550 0.0463 0.0520
22:01-23:00, Sat., 10 Feb. 0.0585 0.0514 0.0542
21:01-22:00, Sat., 10 Feb. 0.0570 0.0506 0.0531
20:01-21:00, Sat., 10 Feb. 0.0556 0.0491 0.0524
19:01-20:00, Sat., 10 Feb. 0.0537 0.0475 0.0509
18:01-19:00, Sat., 10 Feb. 0.0552 0.0483 0.0527
17:01-18:00, Sat., 10 Feb. 0.0553 0.0464 0.0511
16:01-17:00, Sat., 10 Feb. 0.0531 0.0473 0.0505
15:01-16:00, Sat., 10 Feb. 0.0541 0.0484 0.0511
14:01-15:00, Sat., 10 Feb. 0.0561 0.0477 0.0513