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, October 24,2017 Hachioji
From 13:00 to 16:00 on Tuesday, October 24,2017 Adachi
From 10:00 to 13:00 on Wednesday, October 25,2017 Chofu
From 13:00 to 16:00 on Wednesday, October 25,2017 Ota
From 10:00 to 13:00 on Thursday, October 26,2017 Kodaira
From 13:00 to 16:00 on Thursday, October 26,2017 Edogawa
From 10:00 to 13:00 on Friday, October 27,2017 Shinjuku

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 8:00 to 19:00 on Saturday, October 28,2017






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
11:01-12:00, Mon., 11 Dec. 0.0546 0.0488 0.0517
10:01-11:00, Mon., 11 Dec. 0.0549 0.0487 0.0520
09:01-10:00, Mon., 11 Dec. 0.0545 0.0485 0.0514
08:01-09:00, Mon., 11 Dec. 0.0551 0.0479 0.0510
07:01-08:00, Mon., 11 Dec. 0.0535 0.0478 0.0510
06:01-07:00, Mon., 11 Dec. 0.0536 0.0471 0.0507
05:01-06:00, Mon., 11 Dec. 0.0538 0.0481 0.0508
04:01-05:00, Mon., 11 Dec. 0.0526 0.0471 0.0501
03:01-04:00, Mon., 11 Dec. 0.0529 0.0468 0.0499
02:01-03:00, Mon., 11 Dec. 0.0529 0.0471 0.0501
01:01-02:00, Mon., 11 Dec. 0.0530 0.0467 0.0499
00:01-01:00, Mon., 11 Dec. 0.0540 0.0485 0.0501
23:01-24:00, Sun., 10 Dec. 0.0526 0.0455 0.0496
22:01-23:00, Sun., 10 Dec. 0.0527 0.0466 0.0497
21:01-22:00, Sun., 10 Dec. 0.0529 0.0471 0.0501
20:01-21:00, Sun., 10 Dec. 0.0532 0.0472 0.0501
19:01-20:00, Sun., 10 Dec. 0.0526 0.0475 0.0503
18:01-19:00, Sun., 10 Dec. 0.0529 0.0458 0.0496
17:01-18:00, Sun., 10 Dec. 0.0535 0.0464 0.0497
16:01-17:00, Sun., 10 Dec. 0.0523 0.0469 0.0497
15:01-16:00, Sun., 10 Dec. 0.0529 0.0451 0.0494
14:01-15:00, Sun., 10 Dec. 0.0523 0.0472 0.0500
13:01-14:00, Sun., 10 Dec. 0.0539 0.0460 0.0502
12:01-13:00, Sun., 10 Dec. 0.0550 0.0480 0.0512
11:01-12:00, Sun., 10 Dec. 0.0541 0.0485 0.0512
10:01-11:00, Sun., 10 Dec. 0.0548 0.0472 0.0510
09:01-10:00, Sun., 10 Dec. 0.0536 0.0467 0.0508
08:01-09:00, Sun., 10 Dec. 0.0540 0.0476 0.0511
07:01-08:00, Sun., 10 Dec. 0.0557 0.0480 0.0510
06:01-07:00, Sun., 10 Dec. 0.0555 0.0460 0.0507
05:01-06:00, Sun., 10 Dec. 0.0529 0.0476 0.0502
04:01-05:00, Sun., 10 Dec. 0.0538 0.0477 0.0503
03:01-04:00, Sun., 10 Dec. 0.0531 0.0468 0.0502
02:01-03:00, Sun., 10 Dec. 0.0543 0.0474 0.0502
01:01-02:00, Sun., 10 Dec. 0.0525 0.0467 0.0496
00:01-01:00, Sun., 10 Dec. 0.0529 0.0466 0.0498
23:01-24:00, Sat., 09 Dec. 0.0525 0.0465 0.0495
22:01-23:00, Sat., 09 Dec. 0.0523 0.0468 0.0492
21:01-22:00, Sat., 09 Dec. 0.0520 0.0463 0.0493
20:01-21:00, Sat., 09 Dec. 0.0516 0.0455 0.0493
19:01-20:00, Sat., 09 Dec. 0.0520 0.0461 0.0488
18:01-19:00, Sat., 09 Dec. 0.0516 0.0460 0.0490
17:01-18:00, Sat., 09 Dec. 0.0531 0.0459 0.0496
16:01-17:00, Sat., 09 Dec. 0.0539 0.0458 0.0492
15:01-16:00, Sat., 09 Dec. 0.0524 0.0466 0.0494
14:01-15:00, Sat., 09 Dec. 0.0526 0.0462 0.0500
13:01-14:00, Sat., 09 Dec. 0.0526 0.0453 0.0496
12:01-13:00, Sat., 09 Dec. 0.0528 0.0478 0.0501
11:01-12:00, Sat., 09 Dec. 0.0522 0.0462 0.0494
10:01-11:00, Sat., 09 Dec. 0.0537 0.0455 0.0491
09:01-10:00, Sat., 09 Dec. 0.0524 0.0461 0.0493
08:01-09:00, Sat., 09 Dec. 0.0519 0.0456 0.0490
07:01-08:00, Sat., 09 Dec. 0.0527 0.0454 0.0485
06:01-07:00, Sat., 09 Dec. 0.0520 0.0459 0.0488
05:01-06:00, Sat., 09 Dec. 0.0528 0.0454 0.0493
04:01-05:00, Sat., 09 Dec. 0.0533 0.0447 0.0489
03:01-04:00, Sat., 09 Dec. 0.0524 0.0465 0.0491
02:01-03:00, Sat., 09 Dec. 0.0525 0.0453 0.0491
01:01-02:00, Sat., 09 Dec. 0.0520 0.0457 0.0492
00:01-01:00, Sat., 09 Dec. 0.0532 0.0469 0.0503
23:01-24:00, Fri., 08 Dec. 0.0582 0.0479 0.0532
22:01-23:00, Fri., 08 Dec. 0.0648 0.0539 0.0599
21:01-22:00, Fri., 08 Dec. 0.0749 0.0594 0.0673
20:01-21:00, Fri., 08 Dec. 0.0789 0.0673 0.0720
19:01-20:00, Fri., 08 Dec. 0.0700 0.0572 0.0636
18:01-19:00, Fri., 08 Dec. 0.0619 0.0493 0.0552
17:01-18:00, Fri., 08 Dec. 0.0556 0.0491 0.0526
16:01-17:00, Fri., 08 Dec. 0.0549 0.0480 0.0517
15:01-16:00, Fri., 08 Dec. 0.0551 0.0491 0.0518
14:01-15:00, Fri., 08 Dec. 0.0559 0.0489 0.0518
13:01-14:00, Fri., 08 Dec. 0.0547 0.0497 0.0520
12:01-13:00, Fri., 08 Dec. 0.0556 0.0492 0.0522
11:01-12:00, Fri., 08 Dec. 0.0556 0.0489 0.0526
10:01-11:00, Fri., 08 Dec. 0.0552 0.0481 0.0524
09:01-10:00, Fri., 08 Dec. 0.0555 0.0478 0.0522
08:01-09:00, Fri., 08 Dec. 0.0558 0.0479 0.0516
07:01-08:00, Fri., 08 Dec. 0.0547 0.0463 0.0512
06:01-07:00, Fri., 08 Dec. 0.0537 0.0480 0.0508
05:01-06:00, Fri., 08 Dec. 0.0552 0.0480 0.0511
04:01-05:00, Fri., 08 Dec. 0.0534 0.0471 0.0509
03:01-04:00, Fri., 08 Dec. 0.0540 0.0486 0.0509
02:01-03:00, Fri., 08 Dec. 0.0544 0.0475 0.0511
01:01-02:00, Fri., 08 Dec. 0.0542 0.0481 0.0510
00:01-01:00, Fri., 08 Dec. 0.0540 0.0480 0.0507
23:01-24:00, Thu., 07 Dec. 0.0539 0.0471 0.0503
22:01-23:00, Thu., 07 Dec. 0.0529 0.0475 0.0500
21:01-22:00, Thu., 07 Dec. 0.0534 0.0481 0.0507
20:01-21:00, Thu., 07 Dec. 0.0543 0.0473 0.0500
19:01-20:00, Thu., 07 Dec. 0.0538 0.0466 0.0500
18:01-19:00, Thu., 07 Dec. 0.0532 0.0461 0.0498
17:01-18:00, Thu., 07 Dec. 0.0528 0.0468 0.0501
16:01-17:00, Thu., 07 Dec. 0.0522 0.0466 0.0500
15:01-16:00, Thu., 07 Dec. 0.0544 0.0467 0.0507
14:01-15:00, Thu., 07 Dec. 0.0546 0.0483 0.0513
13:01-14:00, Thu., 07 Dec. 0.0536 0.0485 0.0509
12:01-13:00, Thu., 07 Dec. 0.0545 0.0489 0.0517
11:01-12:00, Thu., 07 Dec. 0.0562 0.0476 0.0517
10:01-11:00, Thu., 07 Dec. 0.0542 0.0475 0.0513
09:01-10:00, Thu., 07 Dec. 0.0546 0.0488 0.0514
08:01-09:00, Thu., 07 Dec. 0.0540 0.0467 0.0509
07:01-08:00, Thu., 07 Dec. 0.0561 0.0470 0.0508
06:01-07:00, Thu., 07 Dec. 0.0542 0.0470 0.0507
05:01-06:00, Thu., 07 Dec. 0.0529 0.0463 0.0503
04:01-05:00, Thu., 07 Dec. 0.0547 0.0472 0.0504
03:01-04:00, Thu., 07 Dec. 0.0541 0.0477 0.0505
02:01-03:00, Thu., 07 Dec. 0.0528 0.0469 0.0498
01:01-02:00, Thu., 07 Dec. 0.0530 0.0480 0.0502
00:01-01:00, Thu., 07 Dec. 0.0538 0.0481 0.0507
23:01-24:00, Wed., 06 Dec. 0.0537 0.0472 0.0504
22:01-23:00, Wed., 06 Dec. 0.0545 0.0466 0.0507
21:01-22:00, Wed., 06 Dec. 0.0533 0.0476 0.0503
20:01-21:00, Wed., 06 Dec. 0.0541 0.0481 0.0506
19:01-20:00, Wed., 06 Dec. 0.0545 0.0464 0.0502
18:01-19:00, Wed., 06 Dec. 0.0540 0.0467 0.0502
17:01-18:00, Wed., 06 Dec. 0.0534 0.0470 0.0504
16:01-17:00, Wed., 06 Dec. 0.0543 0.0466 0.0506
15:01-16:00, Wed., 06 Dec. 0.0544 0.0468 0.0512
14:01-15:00, Wed., 06 Dec. 0.0552 0.0488 0.0511
13:01-14:00, Wed., 06 Dec. 0.0534 0.0472 0.0506
12:01-13:00, Wed., 06 Dec. 0.0541 0.0460 0.0509
11:01-12:00, Wed., 06 Dec. 0.0539 0.0477 0.0509
10:01-11:00, Wed., 06 Dec. 0.0537 0.0468 0.0505
09:01-10:00, Wed., 06 Dec. 0.0540 0.0475 0.0505
08:01-09:00, Wed., 06 Dec. 0.0540 0.0474 0.0504
07:01-08:00, Wed., 06 Dec. 0.0545 0.0461 0.0498
06:01-07:00, Wed., 06 Dec. 0.0537 0.0474 0.0501
05:01-06:00, Wed., 06 Dec. 0.0527 0.0467 0.0500
04:01-05:00, Wed., 06 Dec. 0.0532 0.0474 0.0497
03:01-04:00, Wed., 06 Dec. 0.0525 0.0468 0.0498
02:01-03:00, Wed., 06 Dec. 0.0521 0.0470 0.0498
01:01-02:00, Wed., 06 Dec. 0.0529 0.0468 0.0495
00:01-01:00, Wed., 06 Dec. 0.0519 0.0473 0.0497
23:01-24:00, Tue., 05 Dec. 0.0530 0.0469 0.0495
22:01-23:00, Tue., 05 Dec. 0.0527 0.0466 0.0497
21:01-22:00, Tue., 05 Dec. 0.0542 0.0461 0.0496
20:01-21:00, Tue., 05 Dec. 0.0543 0.0471 0.0503
19:01-20:00, Tue., 05 Dec. 0.0537 0.0457 0.0502
18:01-19:00, Tue., 05 Dec. 0.0536 0.0466 0.0501
17:01-18:00, Tue., 05 Dec. 0.0523 0.0463 0.0499
16:01-17:00, Tue., 05 Dec. 0.0537 0.0472 0.0500
15:01-16:00, Tue., 05 Dec. 0.0531 0.0470 0.0506
14:01-15:00, Tue., 05 Dec. 0.0552 0.0473 0.0510
13:01-14:00, Tue., 05 Dec. 0.0541 0.0471 0.0510
12:01-13:00, Tue., 05 Dec. 0.0540 0.0481 0.0511
11:01-12:00, Tue., 05 Dec. 0.0547 0.0474 0.0513
10:01-11:00, Tue., 05 Dec. 0.0550 0.0490 0.0512
09:01-10:00, Tue., 05 Dec. 0.0551 0.0480 0.0513
08:01-09:00, Tue., 05 Dec. 0.0544 0.0477 0.0511
07:01-08:00, Tue., 05 Dec. 0.0540 0.0475 0.0507
06:01-07:00, Tue., 05 Dec. 0.0548 0.0474 0.0507
05:01-06:00, Tue., 05 Dec. 0.0560 0.0473 0.0505
04:01-05:00, Tue., 05 Dec. 0.0537 0.0463 0.0509
03:01-04:00, Tue., 05 Dec. 0.0559 0.0475 0.0508
02:01-03:00, Tue., 05 Dec. 0.0538 0.0484 0.0506
01:01-02:00, Tue., 05 Dec. 0.0537 0.0477 0.0504
00:01-01:00, Tue., 05 Dec. 0.0528 0.0474 0.0502
23:01-24:00, Mon., 04 Dec. 0.0536 0.0470 0.0503
22:01-23:00, Mon., 04 Dec. 0.0553 0.0479 0.0507
21:01-22:00, Mon., 04 Dec. 0.0547 0.0470 0.0511
20:01-21:00, Mon., 04 Dec. 0.0547 0.0495 0.0518
19:01-20:00, Mon., 04 Dec. 0.0567 0.0482 0.0523
18:01-19:00, Mon., 04 Dec. 0.0549 0.0475 0.0508
17:01-18:00, Mon., 04 Dec. 0.0544 0.0484 0.0511
16:01-17:00, Mon., 04 Dec. 0.0550 0.0483 0.0506
15:01-16:00, Mon., 04 Dec. 0.0543 0.0471 0.0512
14:01-15:00, Mon., 04 Dec. 0.0539 0.0474 0.0510
13:01-14:00, Mon., 04 Dec. 0.0542 0.0486 0.0512
12:01-13:00, Mon., 04 Dec. 0.0556 0.0470 0.0511
11:01-12:00, Mon., 04 Dec. 0.0566 0.0467 0.0512
10:01-11:00, Mon., 04 Dec. 0.0552 0.0473 0.0514
09:01-10:00, Mon., 04 Dec. 0.0537 0.0482 0.0511
08:01-09:00, Mon., 04 Dec. 0.0553 0.0484 0.0511
07:01-08:00, Mon., 04 Dec. 0.0529 0.0475 0.0504
06:01-07:00, Mon., 04 Dec. 0.0531 0.0477 0.0505
05:01-06:00, Mon., 04 Dec. 0.0551 0.0477 0.0508
04:01-05:00, Mon., 04 Dec. 0.0559 0.0473 0.0504
03:01-04:00, Mon., 04 Dec. 0.0535 0.0464 0.0504
02:01-03:00, Mon., 04 Dec. 0.0537 0.0471 0.0507
01:01-02:00, Mon., 04 Dec. 0.0543 0.0467 0.0505
00:01-01:00, Mon., 04 Dec. 0.0565 0.0471 0.0509
23:01-24:00, Sun., 03 Dec. 0.0541 0.0477 0.0506
22:01-23:00, Sun., 03 Dec. 0.0519 0.0468 0.0496
21:01-22:00, Sun., 03 Dec. 0.0528 0.0472 0.0500
20:01-21:00, Sun., 03 Dec. 0.0537 0.0462 0.0493
19:01-20:00, Sun., 03 Dec. 0.0542 0.0460 0.0501
18:01-19:00, Sun., 03 Dec. 0.0533 0.0473 0.0502
17:01-18:00, Sun., 03 Dec. 0.0538 0.0466 0.0502
16:01-17:00, Sun., 03 Dec. 0.0529 0.0468 0.0498
15:01-16:00, Sun., 03 Dec. 0.0535 0.0470 0.0506
14:01-15:00, Sun., 03 Dec. 0.0548 0.0466 0.0505
13:01-14:00, Sun., 03 Dec. 0.0534 0.0486 0.0508
12:01-13:00, Sun., 03 Dec. 0.0532 0.0476 0.0502
11:01-12:00, Sun., 03 Dec. 0.0542 0.0476 0.0509
10:01-11:00, Sun., 03 Dec. 0.0527 0.0465 0.0500
09:01-10:00, Sun., 03 Dec. 0.0543 0.0476 0.0500
08:01-09:00, Sun., 03 Dec. 0.0540 0.0471 0.0503
07:01-08:00, Sun., 03 Dec. 0.0535 0.0481 0.0506
06:01-07:00, Sun., 03 Dec. 0.0529 0.0474 0.0499
05:01-06:00, Sun., 03 Dec. 0.0545 0.0466 0.0504
04:01-05:00, Sun., 03 Dec. 0.0529 0.0462 0.0502
03:01-04:00, Sun., 03 Dec. 0.0519 0.0459 0.0499
02:01-03:00, Sun., 03 Dec. 0.0540 0.0463 0.0499
01:01-02:00, Sun., 03 Dec. 0.0530 0.0471 0.0502
00:01-01:00, Sun., 03 Dec. 0.0532 0.0457 0.0496
23:01-24:00, Sat., 02 Dec. 0.0523 0.0468 0.0494
22:01-23:00, Sat., 02 Dec. 0.0521 0.0457 0.0492
21:01-22:00, Sat., 02 Dec. 0.0522 0.0461 0.0489
20:01-21:00, Sat., 02 Dec. 0.0527 0.0462 0.0494
19:01-20:00, Sat., 02 Dec. 0.0529 0.0447 0.0490
18:01-19:00, Sat., 02 Dec. 0.0519 0.0461 0.0494
17:01-18:00, Sat., 02 Dec. 0.0525 0.0467 0.0494
16:01-17:00, Sat., 02 Dec. 0.0528 0.0447 0.0491
15:01-16:00, Sat., 02 Dec. 0.0534 0.0474 0.0499
14:01-15:00, Sat., 02 Dec. 0.0537 0.0462 0.0493
13:01-14:00, Sat., 02 Dec. 0.0524 0.0467 0.0495
12:01-13:00, Sat., 02 Dec. 0.0533 0.0470 0.0498
11:01-12:00, Sat., 02 Dec. 0.0527 0.0470 0.0496
10:01-11:00, Sat., 02 Dec. 0.0530 0.0480 0.0500
09:01-10:00, Sat., 02 Dec. 0.0517 0.0459 0.0490
08:01-09:00, Sat., 02 Dec. 0.0520 0.0461 0.0493
07:01-08:00, Sat., 02 Dec. 0.0519 0.0459 0.0491
06:01-07:00, Sat., 02 Dec. 0.0515 0.0459 0.0489
05:01-06:00, Sat., 02 Dec. 0.0529 0.0473 0.0496
04:01-05:00, Sat., 02 Dec. 0.0525 0.0464 0.0498
03:01-04:00, Sat., 02 Dec. 0.0530 0.0460 0.0492
02:01-03:00, Sat., 02 Dec. 0.0518 0.0458 0.0490
01:01-02:00, Sat., 02 Dec. 0.0529 0.0464 0.0494
00:01-01:00, Sat., 02 Dec. 0.0529 0.0472 0.0500
23:01-24:00, Fri., 01 Dec. 0.0532 0.0469 0.0496
22:01-23:00, Fri., 01 Dec. 0.0534 0.0469 0.0499
21:01-22:00, Fri., 01 Dec. 0.0524 0.0459 0.0493
20:01-21:00, Fri., 01 Dec. 0.0531 0.0454 0.0495
19:01-20:00, Fri., 01 Dec. 0.0531 0.0459 0.0495
18:01-19:00, Fri., 01 Dec. 0.0528 0.0465 0.0498
17:01-18:00, Fri., 01 Dec. 0.0521 0.0470 0.0497
16:01-17:00, Fri., 01 Dec. 0.0725 0.0464 0.0514
15:01-16:00, Fri., 01 Dec. 0.0527 0.0462 0.0495
14:01-15:00, Fri., 01 Dec. 0.0527 0.0471 0.0498
13:01-14:00, Fri., 01 Dec. 0.0526 0.0461 0.0499
12:01-13:00, Fri., 01 Dec. 0.0527 0.0466 0.0496