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, Tue., 17 Oct. 0.0594 0.0516 0.0553
10:01-11:00, Tue., 17 Oct. 0.0578 0.0510 0.0546
09:01-10:00, Tue., 17 Oct. 0.0573 0.0508 0.0540
08:01-09:00, Tue., 17 Oct. 0.0587 0.0510 0.0549
07:01-08:00, Tue., 17 Oct. 0.0583 0.0495 0.0549
06:01-07:00, Tue., 17 Oct. 0.0588 0.0526 0.0559
05:01-06:00, Tue., 17 Oct. 0.0610 0.0508 0.0551
04:01-05:00, Tue., 17 Oct. 0.0569 0.0493 0.0530
03:01-04:00, Tue., 17 Oct. 0.0616 0.0521 0.0572
02:01-03:00, Tue., 17 Oct. 0.0625 0.0525 0.0561
01:01-02:00, Tue., 17 Oct. 0.0592 0.0519 0.0558
00:01-01:00, Tue., 17 Oct. 0.0596 0.0516 0.0551
23:01-24:00, Mon., 16 Oct. 0.0580 0.0515 0.0545
22:01-23:00, Mon., 16 Oct. 0.0584 0.0508 0.0550
21:01-22:00, Mon., 16 Oct. 0.0586 0.0518 0.0547
20:01-21:00, Mon., 16 Oct. 0.0580 0.0499 0.0547
19:01-20:00, Mon., 16 Oct. 0.0639 0.0524 0.0580
18:01-19:00, Mon., 16 Oct. 0.0710 0.0584 0.0649
17:01-18:00, Mon., 16 Oct. 0.0715 0.0624 0.0675
16:01-17:00, Mon., 16 Oct. 0.0720 0.0645 0.0684
15:01-16:00, Mon., 16 Oct. 0.0704 0.0613 0.0668
14:01-15:00, Mon., 16 Oct. 0.0759 0.0659 0.0702
13:01-14:00, Mon., 16 Oct. 0.0783 0.0672 0.0710
12:01-13:00, Mon., 16 Oct. 0.0734 0.0557 0.0651
11:01-12:00, Mon., 16 Oct. 0.0633 0.0541 0.0589
10:01-11:00, Mon., 16 Oct. 0.0618 0.0543 0.0573
09:01-10:00, Mon., 16 Oct. 0.0630 0.0544 0.0593
08:01-09:00, Mon., 16 Oct. 0.0640 0.0534 0.0590
07:01-08:00, Mon., 16 Oct. 0.0630 0.0559 0.0591
06:01-07:00, Mon., 16 Oct. 0.0647 0.0570 0.0612
05:01-06:00, Mon., 16 Oct. 0.0642 0.0580 0.0613
04:01-05:00, Mon., 16 Oct. 0.0659 0.0551 0.0601
03:01-04:00, Mon., 16 Oct. 0.0619 0.0552 0.0587
02:01-03:00, Mon., 16 Oct. 0.0652 0.0578 0.0611
01:01-02:00, Mon., 16 Oct. 0.0657 0.0556 0.0608
00:01-01:00, Mon., 16 Oct. 0.0598 0.0525 0.0564
23:01-24:00, Sun., 15 Oct. 0.0602 0.0521 0.0571
22:01-23:00, Sun., 15 Oct. 0.0592 0.0523 0.0557
21:01-22:00, Sun., 15 Oct. 0.0569 0.0490 0.0533
20:01-21:00, Sun., 15 Oct. 0.0550 0.0481 0.0517
19:01-20:00, Sun., 15 Oct. 0.0541 0.0483 0.0511
18:01-19:00, Sun., 15 Oct. 0.0535 0.0470 0.0509
17:01-18:00, Sun., 15 Oct. 0.0548 0.0485 0.0522
16:01-17:00, Sun., 15 Oct. 0.0565 0.0499 0.0534
15:01-16:00, Sun., 15 Oct. 0.0578 0.0501 0.0541
14:01-15:00, Sun., 15 Oct. 0.0570 0.0493 0.0532
13:01-14:00, Sun., 15 Oct. 0.0574 0.0495 0.0538
12:01-13:00, Sun., 15 Oct. 0.0583 0.0518 0.0551
11:01-12:00, Sun., 15 Oct. 0.0584 0.0496 0.0536
10:01-11:00, Sun., 15 Oct. 0.0573 0.0496 0.0528
09:01-10:00, Sun., 15 Oct. 0.0557 0.0490 0.0528
08:01-09:00, Sun., 15 Oct. 0.0567 0.0507 0.0533
07:01-08:00, Sun., 15 Oct. 0.0562 0.0507 0.0536
06:01-07:00, Sun., 15 Oct. 0.0558 0.0488 0.0520
05:01-06:00, Sun., 15 Oct. 0.0544 0.0489 0.0514
04:01-05:00, Sun., 15 Oct. 0.0543 0.0481 0.0512
03:01-04:00, Sun., 15 Oct. 0.0546 0.0467 0.0508
02:01-03:00, Sun., 15 Oct. 0.0543 0.0480 0.0508
01:01-02:00, Sun., 15 Oct. 0.0539 0.0475 0.0506
00:01-01:00, Sun., 15 Oct. 0.0538 0.0481 0.0507
23:01-24:00, Sat., 14 Oct. 0.0553 0.0472 0.0515
22:01-23:00, Sat., 14 Oct. 0.0563 0.0492 0.0521
21:01-22:00, Sat., 14 Oct. 0.0556 0.0489 0.0524
20:01-21:00, Sat., 14 Oct. 0.0560 0.0481 0.0525
19:01-20:00, Sat., 14 Oct. 0.0576 0.0496 0.0531
18:01-19:00, Sat., 14 Oct. 0.0568 0.0500 0.0536
17:01-18:00, Sat., 14 Oct. 0.0560 0.0480 0.0523
16:01-17:00, Sat., 14 Oct. 0.0550 0.0477 0.0513
15:01-16:00, Sat., 14 Oct. 0.0532 0.0481 0.0507
14:01-15:00, Sat., 14 Oct. 0.0533 0.0462 0.0501
13:01-14:00, Sat., 14 Oct. 0.0537 0.0475 0.0508
12:01-13:00, Sat., 14 Oct. 0.0539 0.0483 0.0512
11:01-12:00, Sat., 14 Oct. 0.0556 0.0486 0.0515
10:01-11:00, Sat., 14 Oct. 0.0566 0.0485 0.0516
09:01-10:00, Sat., 14 Oct. 0.0564 0.0495 0.0524
08:01-09:00, Sat., 14 Oct. 0.0610 0.0503 0.0554
07:01-08:00, Sat., 14 Oct. 0.0606 0.0531 0.0564
06:01-07:00, Sat., 14 Oct. 0.0624 0.0533 0.0584
05:01-06:00, Sat., 14 Oct. 0.0672 0.0578 0.0627
04:01-05:00, Sat., 14 Oct. 0.0666 0.0597 0.0627
03:01-04:00, Sat., 14 Oct. 0.0678 0.0606 0.0640
02:01-03:00, Sat., 14 Oct. 0.0681 0.0595 0.0642
01:01-02:00, Sat., 14 Oct. 0.0674 0.0554 0.0602
00:01-01:00, Sat., 14 Oct. 0.0622 0.0502 0.0549
23:01-24:00, Fri., 13 Oct. 0.0585 0.0508 0.0539
22:01-23:00, Fri., 13 Oct. 0.0560 0.0479 0.0513
21:01-22:00, Fri., 13 Oct. 0.0552 0.0491 0.0516
20:01-21:00, Fri., 13 Oct. 0.0546 0.0490 0.0513
19:01-20:00, Fri., 13 Oct. 0.0552 0.0494 0.0525
18:01-19:00, Fri., 13 Oct. 0.0600 0.0523 0.0562
17:01-18:00, Fri., 13 Oct. 0.0608 0.0506 0.0562
16:01-17:00, Fri., 13 Oct. 0.0614 0.0512 0.0562
15:01-16:00, Fri., 13 Oct. 0.0559 0.0507 0.0535
14:01-15:00, Fri., 13 Oct. 0.0571 0.0498 0.0541
13:01-14:00, Fri., 13 Oct. 0.0630 0.0536 0.0579
12:01-13:00, Fri., 13 Oct. 0.0615 0.0535 0.0573
11:01-12:00, Fri., 13 Oct. 0.0658 0.0511 0.0569
10:01-11:00, Fri., 13 Oct. 0.0594 0.0527 0.0559
09:01-10:00, Fri., 13 Oct. 0.0630 0.0548 0.0587
08:01-09:00, Fri., 13 Oct. 0.0638 0.0562 0.0606
07:01-08:00, Fri., 13 Oct. 0.0616 0.0526 0.0565
06:01-07:00, Fri., 13 Oct. 0.0594 0.0494 0.0537
05:01-06:00, Fri., 13 Oct. 0.0555 0.0484 0.0517
04:01-05:00, Fri., 13 Oct. 0.0547 0.0491 0.0516
03:01-04:00, Fri., 13 Oct. 0.0537 0.0489 0.0516
02:01-03:00, Fri., 13 Oct. 0.0549 0.0486 0.0518
01:01-02:00, Fri., 13 Oct. 0.0558 0.0478 0.0516
00:01-01:00, Fri., 13 Oct. 0.0553 0.0489 0.0518
23:01-24:00, Thu., 12 Oct. 0.0576 0.0496 0.0537
22:01-23:00, Thu., 12 Oct. 0.0613 0.0531 0.0571
21:01-22:00, Thu., 12 Oct. 0.0583 0.0498 0.0529
20:01-21:00, Thu., 12 Oct. 0.0576 0.0505 0.0528
19:01-20:00, Thu., 12 Oct. 0.0553 0.0491 0.0528
18:01-19:00, Thu., 12 Oct. 0.0569 0.0499 0.0528
17:01-18:00, Thu., 12 Oct. 0.0564 0.0490 0.0527
16:01-17:00, Thu., 12 Oct. 0.0569 0.0504 0.0531
15:01-16:00, Thu., 12 Oct. 0.0565 0.0508 0.0529
14:01-15:00, Thu., 12 Oct. 0.0557 0.0497 0.0527
13:01-14:00, Thu., 12 Oct. 0.0558 0.0475 0.0526
12:01-13:00, Thu., 12 Oct. 0.0568 0.0495 0.0528
11:01-12:00, Thu., 12 Oct. 0.0549 0.0484 0.0525
10:01-11:00, Thu., 12 Oct. 0.0555 0.0497 0.0523
09:01-10:00, Thu., 12 Oct. 0.0555 0.0489 0.0521
08:01-09:00, Thu., 12 Oct. 0.0568 0.0491 0.0523
07:01-08:00, Thu., 12 Oct. 0.0552 0.0482 0.0525
06:01-07:00, Thu., 12 Oct. 0.0550 0.0493 0.0524
05:01-06:00, Thu., 12 Oct. 0.0562 0.0490 0.0524
04:01-05:00, Thu., 12 Oct. 0.0554 0.0499 0.0524
03:01-04:00, Thu., 12 Oct. 0.0555 0.0487 0.0521
02:01-03:00, Thu., 12 Oct. 0.0556 0.0493 0.0521
01:01-02:00, Thu., 12 Oct. 0.0560 0.0477 0.0523
00:01-01:00, Thu., 12 Oct. 0.0563 0.0479 0.0521
23:01-24:00, Wed., 11 Oct. 0.0559 0.0493 0.0522
22:01-23:00, Wed., 11 Oct. 0.0554 0.0488 0.0520
21:01-22:00, Wed., 11 Oct. 0.0546 0.0489 0.0516
20:01-21:00, Wed., 11 Oct. 0.0561 0.0482 0.0519
19:01-20:00, Wed., 11 Oct. 0.0551 0.0481 0.0517
18:01-19:00, Wed., 11 Oct. 0.0552 0.0481 0.0518
17:01-18:00, Wed., 11 Oct. 0.0553 0.0493 0.0519
16:01-17:00, Wed., 11 Oct. 0.0554 0.0490 0.0519
15:01-16:00, Wed., 11 Oct. 0.0569 0.0495 0.0522
14:01-15:00, Wed., 11 Oct. 0.0556 0.0484 0.0518
13:01-14:00, Wed., 11 Oct. 0.0551 0.0484 0.0520
12:01-13:00, Wed., 11 Oct. 0.0559 0.0484 0.0516
11:01-12:00, Wed., 11 Oct. 0.0543 0.0491 0.0517
10:01-11:00, Wed., 11 Oct. 0.0560 0.0491 0.0521
09:01-10:00, Wed., 11 Oct. 0.0548 0.0486 0.0523
08:01-09:00, Wed., 11 Oct. 0.0568 0.0493 0.0528
07:01-08:00, Wed., 11 Oct. 0.0565 0.0494 0.0527
06:01-07:00, Wed., 11 Oct. 0.0573 0.0496 0.0528
05:01-06:00, Wed., 11 Oct. 0.0556 0.0498 0.0524
04:01-05:00, Wed., 11 Oct. 0.0568 0.0496 0.0526
03:01-04:00, Wed., 11 Oct. 0.0560 0.0491 0.0526
02:01-03:00, Wed., 11 Oct. 0.0546 0.0489 0.0519
01:01-02:00, Wed., 11 Oct. 0.0556 0.0493 0.0520
00:01-01:00, Wed., 11 Oct. 0.0567 0.0494 0.0518
23:01-24:00, Tue., 10 Oct. 0.0545 0.0491 0.0520
22:01-23:00, Tue., 10 Oct. 0.0558 0.0487 0.0522
21:01-22:00, Tue., 10 Oct. 0.0556 0.0486 0.0521
20:01-21:00, Tue., 10 Oct. 0.0553 0.0489 0.0519
19:01-20:00, Tue., 10 Oct. 0.0553 0.0484 0.0519
18:01-19:00, Tue., 10 Oct. 0.0546 0.0491 0.0520
17:01-18:00, Tue., 10 Oct. 0.0547 0.0474 0.0516
16:01-17:00, Tue., 10 Oct. 0.0557 0.0487 0.0517
15:01-16:00, Tue., 10 Oct. 0.0552 0.0482 0.0523
14:01-15:00, Tue., 10 Oct. 0.0549 0.0502 0.0523
13:01-14:00, Tue., 10 Oct. 0.0558 0.0491 0.0522
12:01-13:00, Tue., 10 Oct. 0.0550 0.0492 0.0518
11:01-12:00, Tue., 10 Oct. 0.0556 0.0481 0.0523
10:01-11:00, Tue., 10 Oct. 0.0545 0.0482 0.0515
09:01-10:00, Tue., 10 Oct. 0.0553 0.0491 0.0518
08:01-09:00, Tue., 10 Oct. 0.0559 0.0487 0.0520
07:01-08:00, Tue., 10 Oct. 0.0559 0.0483 0.0522
06:01-07:00, Tue., 10 Oct. 0.0547 0.0478 0.0517
05:01-06:00, Tue., 10 Oct. 0.0559 0.0483 0.0518
04:01-05:00, Tue., 10 Oct. 0.0552 0.0487 0.0514
03:01-04:00, Tue., 10 Oct. 0.0547 0.0486 0.0513
02:01-03:00, Tue., 10 Oct. 0.0543 0.0474 0.0510
01:01-02:00, Tue., 10 Oct. 0.0549 0.0476 0.0512
00:01-01:00, Tue., 10 Oct. 0.0537 0.0478 0.0510
23:01-24:00, Mon., 09 Oct. 0.0536 0.0481 0.0511
22:01-23:00, Mon., 09 Oct. 0.0550 0.0470 0.0508
21:01-22:00, Mon., 09 Oct. 0.0548 0.0479 0.0513
20:01-21:00, Mon., 09 Oct. 0.0540 0.0487 0.0510
19:01-20:00, Mon., 09 Oct. 0.0543 0.0472 0.0510
18:01-19:00, Mon., 09 Oct. 0.0561 0.0473 0.0514
17:01-18:00, Mon., 09 Oct. 0.0548 0.0474 0.0515
16:01-17:00, Mon., 09 Oct. 0.0543 0.0475 0.0510
15:01-16:00, Mon., 09 Oct. 0.0553 0.0480 0.0516
14:01-15:00, Mon., 09 Oct. 0.0541 0.0486 0.0513
13:01-14:00, Mon., 09 Oct. 0.0550 0.0486 0.0513
12:01-13:00, Mon., 09 Oct. 0.0536 0.0474 0.0508
11:01-12:00, Mon., 09 Oct. 0.0539 0.0487 0.0508
10:01-11:00, Mon., 09 Oct. 0.0541 0.0483 0.0513
09:01-10:00, Mon., 09 Oct. 0.0543 0.0484 0.0513
08:01-09:00, Mon., 09 Oct. 0.0547 0.0475 0.0512
07:01-08:00, Mon., 09 Oct. 0.0553 0.0481 0.0513
06:01-07:00, Mon., 09 Oct. 0.0546 0.0479 0.0505
05:01-06:00, Mon., 09 Oct. 0.0534 0.0477 0.0506
04:01-05:00, Mon., 09 Oct. 0.0537 0.0472 0.0507
03:01-04:00, Mon., 09 Oct. 0.0545 0.0462 0.0506
02:01-03:00, Mon., 09 Oct. 0.0535 0.0477 0.0508
01:01-02:00, Mon., 09 Oct. 0.0533 0.0477 0.0506
00:01-01:00, Mon., 09 Oct. 0.0543 0.0481 0.0507
23:01-24:00, Sun., 08 Oct. 0.0548 0.0474 0.0505
22:01-23:00, Sun., 08 Oct. 0.0539 0.0459 0.0504
21:01-22:00, Sun., 08 Oct. 0.0548 0.0461 0.0505
20:01-21:00, Sun., 08 Oct. 0.0543 0.0471 0.0506
19:01-20:00, Sun., 08 Oct. 0.0540 0.0470 0.0505
18:01-19:00, Sun., 08 Oct. 0.0550 0.0461 0.0510
17:01-18:00, Sun., 08 Oct. 0.0551 0.0468 0.0506
16:01-17:00, Sun., 08 Oct. 0.0535 0.0472 0.0506
15:01-16:00, Sun., 08 Oct. 0.0541 0.0472 0.0505
14:01-15:00, Sun., 08 Oct. 0.0537 0.0475 0.0503
13:01-14:00, Sun., 08 Oct. 0.0549 0.0460 0.0507
12:01-13:00, Sun., 08 Oct. 0.0545 0.0476 0.0508
11:01-12:00, Sun., 08 Oct. 0.0546 0.0465 0.0506
10:01-11:00, Sun., 08 Oct. 0.0548 0.0478 0.0507
09:01-10:00, Sun., 08 Oct. 0.0546 0.0470 0.0504
08:01-09:00, Sun., 08 Oct. 0.0546 0.0474 0.0506
07:01-08:00, Sun., 08 Oct. 0.0541 0.0473 0.0505
06:01-07:00, Sun., 08 Oct. 0.0539 0.0478 0.0505
05:01-06:00, Sun., 08 Oct. 0.0553 0.0476 0.0506
04:01-05:00, Sun., 08 Oct. 0.0530 0.0463 0.0505
03:01-04:00, Sun., 08 Oct. 0.0534 0.0479 0.0507
02:01-03:00, Sun., 08 Oct. 0.0544 0.0474 0.0506
01:01-02:00, Sun., 08 Oct. 0.0541 0.0466 0.0507
00:01-01:00, Sun., 08 Oct. 0.0535 0.0473 0.0504
23:01-24:00, Sat., 07 Oct. 0.0541 0.0464 0.0504
22:01-23:00, Sat., 07 Oct. 0.0531 0.0470 0.0501
21:01-22:00, Sat., 07 Oct. 0.0541 0.0461 0.0504
20:01-21:00, Sat., 07 Oct. 0.0537 0.0473 0.0503
19:01-20:00, Sat., 07 Oct. 0.0532 0.0474 0.0501
18:01-19:00, Sat., 07 Oct. 0.0543 0.0466 0.0504
17:01-18:00, Sat., 07 Oct. 0.0547 0.0485 0.0504
16:01-17:00, Sat., 07 Oct. 0.0541 0.0458 0.0507
15:01-16:00, Sat., 07 Oct. 0.0526 0.0477 0.0503
14:01-15:00, Sat., 07 Oct. 0.0534 0.0467 0.0502
13:01-14:00, Sat., 07 Oct. 0.0543 0.0478 0.0505
12:01-13:00, Sat., 07 Oct. 0.0541 0.0475 0.0507