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

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. 0.0402 0.0352 0.0370
12:01-13:00, Tue., 20 Feb. 0.0411 0.0354 0.0373
11:01-12:00, Tue., 20 Feb. 0.0419 0.0351 0.0371
10:01-11:00, Tue., 20 Feb. 0.0415 0.0347 0.0373
09:01-10:00, Tue., 20 Feb. 0.0422 0.0354 0.0372
08:01-09:00, Tue., 20 Feb. 0.0397 0.0352 0.0372
07:01-08:00, Tue., 20 Feb. 0.0406 0.0355 0.0371
06:01-07:00, Tue., 20 Feb. 0.0399 0.0348 0.0373
05:01-06:00, Tue., 20 Feb. 0.0397 0.0347 0.0368
04:01-05:00, Tue., 20 Feb. 0.0403 0.0350 0.0371
03:01-04:00, Tue., 20 Feb. 0.0399 0.0348 0.0368
02:01-03:00, Tue., 20 Feb. 0.0422 0.0350 0.0372
01:01-02:00, Tue., 20 Feb. 0.0394 0.0347 0.0368
00:01-01:00, Tue., 20 Feb. 0.0405 0.0342 0.0368
23:01-24:00, Mon., 19 Feb. 0.0405 0.0350 0.0367
22:01-23:00, Mon., 19 Feb. 0.0419 0.0348 0.0372
21:01-22:00, Mon., 19 Feb. 0.0400 0.0343 0.0368
20:01-21:00, Mon., 19 Feb. 0.0402 0.0346 0.0368
19:01-20:00, Mon., 19 Feb. 0.0397 0.0348 0.0367
18:01-19:00, Mon., 19 Feb. 0.0408 0.0344 0.0366
17:01-18:00, Mon., 19 Feb. 0.0405 0.0349 0.0367
16:01-17:00, Mon., 19 Feb. 0.0398 0.0346 0.0366
15:01-16:00, Mon., 19 Feb. 0.0406 0.0345 0.0367
14:01-15:00, Mon., 19 Feb. 0.0429 0.0352 0.0369
13:01-14:00, Mon., 19 Feb. 0.0406 0.0350 0.0369
12:01-13:00, Mon., 19 Feb. 0.0410 0.0350 0.0370
11:01-12:00, Mon., 19 Feb. 0.0397 0.0353 0.0369
10:01-11:00, Mon., 19 Feb. 0.0407 0.0349 0.0370
09:01-10:00, Mon., 19 Feb. 0.0401 0.0347 0.0368
08:01-09:00, Mon., 19 Feb. 0.0412 0.0351 0.0370
07:01-08:00, Mon., 19 Feb. 0.0435 0.0352 0.0373
06:01-07:00, Mon., 19 Feb. 0.0398 0.0348 0.0367
05:01-06:00, Mon., 19 Feb. 0.0398 0.0347 0.0370
04:01-05:00, Mon., 19 Feb. 0.0393 0.0347 0.0367
03:01-04:00, Mon., 19 Feb. 0.0399 0.0339 0.0367
02:01-03:00, Mon., 19 Feb. 0.0414 0.0349 0.0370
01:01-02:00, Mon., 19 Feb. 0.0391 0.0349 0.0366
00:01-01:00, Mon., 19 Feb. 0.0405 0.0348 0.0367
23:01-24:00, Sun., 18 Feb. 0.0385 0.0343 0.0364
22:01-23:00, Sun., 18 Feb. 0.0398 0.0343 0.0368
21:01-22:00, Sun., 18 Feb. 0.0401 0.0341 0.0366
20:01-21:00, Sun., 18 Feb. 0.0393 0.0347 0.0367
19:01-20:00, Sun., 18 Feb. 0.0397 0.0342 0.0366
18:01-19:00, Sun., 18 Feb. 0.0393 0.0337 0.0364
17:01-18:00, Sun., 18 Feb. 0.0396 0.0328 0.0365
16:01-17:00, Sun., 18 Feb. 0.0396 0.0348 0.0369
15:01-16:00, Sun., 18 Feb. 0.0402 0.0349 0.0365
14:01-15:00, Sun., 18 Feb. 0.0408 0.0344 0.0367
13:01-14:00, Sun., 18 Feb. 0.0410 0.0344 0.0368
12:01-13:00, Sun., 18 Feb. 0.0400 0.0353 0.0367
11:01-12:00, Sun., 18 Feb. 0.0409 0.0340 0.0369
10:01-11:00, Sun., 18 Feb. 0.0410 0.0351 0.0368
09:01-10:00, Sun., 18 Feb. 0.0395 0.0347 0.0367
08:01-09:00, Sun., 18 Feb. 0.0417 0.0344 0.0367
07:01-08:00, Sun., 18 Feb. 0.0403 0.0351 0.0370
06:01-07:00, Sun., 18 Feb. 0.0402 0.0346 0.0366
05:01-06:00, Sun., 18 Feb. 0.0400 0.0348 0.0367
04:01-05:00, Sun., 18 Feb. 0.0400 0.0344 0.0367
03:01-04:00, Sun., 18 Feb. 0.0387 0.0346 0.0367
02:01-03:00, Sun., 18 Feb. 0.0394 0.0350 0.0370
01:01-02:00, Sun., 18 Feb. 0.0403 0.0349 0.0368
00:01-01:00, Sun., 18 Feb. 0.0405 0.0348 0.0369
23:01-24:00, Sat., 17 Feb. 0.0404 0.0348 0.0368
22:01-23:00, Sat., 17 Feb. 0.0401 0.0345 0.0369
21:01-22:00, Sat., 17 Feb. 0.0414 0.0350 0.0371
20:01-21:00, Sat., 17 Feb. 0.0422 0.0351 0.0372
19:01-20:00, Sat., 17 Feb. 0.0398 0.0347 0.0369
18:01-19:00, Sat., 17 Feb. 0.0425 0.0344 0.0371
17:01-18:00, Sat., 17 Feb. 0.0406 0.0356 0.0376
16:01-17:00, Sat., 17 Feb. 0.0412 0.0358 0.0385
15:01-16:00, Sat., 17 Feb. 0.0451 0.0367 0.0408
14:01-15:00, Sat., 17 Feb. 0.0425 0.0361 0.0387
13:01-14:00, Sat., 17 Feb. 0.0420 0.0343 0.0374
12:01-13:00, Sat., 17 Feb. 0.0403 0.0340 0.0371
11:01-12:00, Sat., 17 Feb. 0.0403 0.0349 0.0367
10:01-11:00, Sat., 17 Feb. 0.0399 0.0340 0.0365
09:01-10:00, Sat., 17 Feb. 0.0402 0.0351 0.0368
08:01-09:00, Sat., 17 Feb. 0.0409 0.0342 0.0365
07:01-08:00, Sat., 17 Feb. 0.0398 0.0347 0.0366
06:01-07:00, Sat., 17 Feb. 0.0405 0.0342 0.0365
05:01-06:00, Sat., 17 Feb. 0.0398 0.0341 0.0366
04:01-05:00, Sat., 17 Feb. 0.0397 0.0352 0.0368
03:01-04:00, Sat., 17 Feb. 0.0398 0.0339 0.0369
02:01-03:00, Sat., 17 Feb. 0.0403 0.0343 0.0367
01:01-02:00, Sat., 17 Feb. 0.0404 0.0345 0.0366
00:01-01:00, Sat., 17 Feb. 0.0408 0.0342 0.0366
23:01-24:00, Fri., 16 Feb. 0.0402 0.0344 0.0365
22:01-23:00, Fri., 16 Feb. 0.0389 0.0349 0.0366
21:01-22:00, Fri., 16 Feb. 0.0399 0.0347 0.0365
20:01-21:00, Fri., 16 Feb. 0.0415 0.0338 0.0365
19:01-20:00, Fri., 16 Feb. 0.0384 0.0349 0.0367
18:01-19:00, Fri., 16 Feb. 0.0395 0.0343 0.0365
17:01-18:00, Fri., 16 Feb. 0.0401 0.0345 0.0364
16:01-17:00, Fri., 16 Feb. 0.0393 0.0346 0.0363
15:01-16:00, Fri., 16 Feb. 0.0420 0.0349 0.0369
14:01-15:00, Fri., 16 Feb. 0.0403 0.0345 0.0368
13:01-14:00, Fri., 16 Feb. 0.0400 0.0349 0.0368
12:01-13:00, Fri., 16 Feb. 0.0384 0.0352 0.0365
11:01-12:00, Fri., 16 Feb. 0.0410 0.0343 0.0366
10:01-11:00, Fri., 16 Feb. 0.0396 0.0349 0.0363
09:01-10:00, Fri., 16 Feb. 0.0391 0.0343 0.0364
08:01-09:00, Fri., 16 Feb. 0.0404 0.0342 0.0366
07:01-08:00, Fri., 16 Feb. 0.0414 0.0343 0.0368
06:01-07:00, Fri., 16 Feb. 0.0406 0.0348 0.0367
05:01-06:00, Fri., 16 Feb. 0.0397 0.0343 0.0367
04:01-05:00, Fri., 16 Feb. 0.0427 0.0335 0.0367
03:01-04:00, Fri., 16 Feb. 0.0402 0.0351 0.0366
02:01-03:00, Fri., 16 Feb. 0.0387 0.0348 0.0366
01:01-02:00, Fri., 16 Feb. 0.0409 0.0347 0.0366
00:01-01:00, Fri., 16 Feb. 0.0401 0.0348 0.0367
23:01-24:00, Thu., 15 Feb. 0.0392 0.0339 0.0364
22:01-23:00, Thu., 15 Feb. 0.0399 0.0345 0.0365
21:01-22:00, Thu., 15 Feb. 0.0403 0.0341 0.0369
20:01-21:00, Thu., 15 Feb. 0.0398 0.0339 0.0366
19:01-20:00, Thu., 15 Feb. 0.0419 0.0345 0.0367
18:01-19:00, Thu., 15 Feb. 0.0400 0.0341 0.0364
17:01-18:00, Thu., 15 Feb. 0.0398 0.0343 0.0367
16:01-17:00, Thu., 15 Feb. 0.0403 0.0348 0.0370
15:01-16:00, Thu., 15 Feb. 0.0395 0.0341 0.0367
14:01-15:00, Thu., 15 Feb. 0.0418 0.0344 0.0370
13:01-14:00, Thu., 15 Feb. 0.0411 0.0348 0.0374
12:01-13:00, Thu., 15 Feb. 0.0405 0.0349 0.0371
11:01-12:00, Thu., 15 Feb. 0.0418 0.0340 0.0370
10:01-11:00, Thu., 15 Feb. 0.0402 0.0349 0.0371
09:01-10:00, Thu., 15 Feb. 0.0404 0.0354 0.0370
08:01-09:00, Thu., 15 Feb. 0.0404 0.0343 0.0369
07:01-08:00, Thu., 15 Feb. 0.0403 0.0346 0.0369
06:01-07:00, Thu., 15 Feb. 0.0410 0.0348 0.0367
05:01-06:00, Thu., 15 Feb. 0.0404 0.0352 0.0370
04:01-05:00, Thu., 15 Feb. 0.0406 0.0343 0.0369
03:01-04:00, Thu., 15 Feb. 0.0392 0.0349 0.0367
02:01-03:00, Thu., 15 Feb. 0.0394 0.0350 0.0365
01:01-02:00, Thu., 15 Feb. 0.0397 0.0347 0.0368
00:01-01:00, Thu., 15 Feb. 0.0406 0.0341 0.0369
23:01-24:00, Wed., 14 Feb. 0.0386 0.0342 0.0364
22:01-23:00, Wed., 14 Feb. 0.0391 0.0346 0.0364
21:01-22:00, Wed., 14 Feb. 0.0392 0.0340 0.0362
20:01-21:00, Wed., 14 Feb. 0.0391 0.0343 0.0366
19:01-20:00, Wed., 14 Feb. 0.0399 0.0339 0.0364
18:01-19:00, Wed., 14 Feb. 0.0398 0.0341 0.0365
17:01-18:00, Wed., 14 Feb. 0.0389 0.0340 0.0364
16:01-17:00, Wed., 14 Feb. 0.0391 0.0351 0.0366
15:01-16:00, Wed., 14 Feb. 0.0389 0.0347 0.0365
14:01-15:00, Wed., 14 Feb. 0.0394 0.0344 0.0364
13:01-14:00, Wed., 14 Feb. 0.0408 0.0350 0.0369
12:01-13:00, Wed., 14 Feb. 0.0396 0.0344 0.0368
11:01-12:00, Wed., 14 Feb. 0.0411 0.0346 0.0366
10:01-11:00, Wed., 14 Feb. 0.0396 0.0348 0.0367
09:01-10:00, Wed., 14 Feb. 0.0410 0.0347 0.0370
08:01-09:00, Wed., 14 Feb. 0.0415 0.0343 0.0374
07:01-08:00, Wed., 14 Feb. 0.0402 0.0346 0.0373
06:01-07:00, Wed., 14 Feb. 0.0397 0.0349 0.0373
05:01-06:00, Wed., 14 Feb. 0.0397 0.0349 0.0370
04:01-05:00, Wed., 14 Feb. 0.0389 0.0345 0.0365
03:01-04:00, Wed., 14 Feb. 0.0399 0.0349 0.0364
02:01-03:00, Wed., 14 Feb. 0.0392 0.0345 0.0366
01:01-02:00, Wed., 14 Feb. 0.0388 0.0338 0.0366
00:01-01:00, Wed., 14 Feb. 0.0401 0.0344 0.0368
23:01-24:00, Tue., 13 Feb. 0.0393 0.0341 0.0366
22:01-23:00, Tue., 13 Feb. 0.0404 0.0338 0.0367
21:01-22:00, Tue., 13 Feb. 0.0401 0.0348 0.0366
20:01-21:00, Tue., 13 Feb. 0.0387 0.0338 0.0366
19:01-20:00, Tue., 13 Feb. 0.0403 0.0342 0.0367
18:01-19:00, Tue., 13 Feb. 0.0410 0.0342 0.0369
17:01-18:00, Tue., 13 Feb. 0.0401 0.0348 0.0368
16:01-17:00, Tue., 13 Feb. 0.0394 0.0341 0.0367
15:01-16:00, Tue., 13 Feb. 0.0400 0.0342 0.0367
14:01-15:00, Tue., 13 Feb. 0.0395 0.0349 0.0369
13:01-14:00, Tue., 13 Feb. 0.0400 0.0342 0.0365
12:01-13:00, Tue., 13 Feb. 0.0403 0.0344 0.0367
11:01-12:00, Tue., 13 Feb. 0.0406 0.0349 0.0367
10:01-11:00, Tue., 13 Feb. 0.0402 0.0350 0.0369
09:01-10:00, Tue., 13 Feb. 0.0399 0.0347 0.0370
08:01-09:00, Tue., 13 Feb. 0.0400 0.0344 0.0369
07:01-08:00, Tue., 13 Feb. 0.0398 0.0347 0.0370
06:01-07:00, Tue., 13 Feb. 0.0404 0.0349 0.0368
05:01-06:00, Tue., 13 Feb. 0.0399 0.0344 0.0368
04:01-05:00, Tue., 13 Feb. 0.0407 0.0344 0.0369
03:01-04:00, Tue., 13 Feb. 0.0401 0.0349 0.0369
02:01-03:00, Tue., 13 Feb. 0.0404 0.0346 0.0371
01:01-02:00, Tue., 13 Feb. 0.0395 0.0346 0.0367
00:01-01:00, Tue., 13 Feb. 0.0421 0.0335 0.0367
23:01-24:00, Mon., 12 Feb. 0.0401 0.0345 0.0366
22:01-23:00, Mon., 12 Feb. 0.0394 0.0344 0.0366
21:01-22:00, Mon., 12 Feb. 0.0397 0.0344 0.0366
20:01-21:00, Mon., 12 Feb. 0.0405 0.0340 0.0366
19:01-20:00, Mon., 12 Feb. 0.0421 0.0346 0.0366
18:01-19:00, Mon., 12 Feb. 0.0397 0.0347 0.0367
17:01-18:00, Mon., 12 Feb. 0.0398 0.0343 0.0366
16:01-17:00, Mon., 12 Feb. 0.0410 0.0352 0.0368
15:01-16:00, Mon., 12 Feb. 0.0401 0.0344 0.0366
14:01-15:00, Mon., 12 Feb. 0.0399 0.0347 0.0370
13:01-14:00, Mon., 12 Feb. 0.0399 0.0347 0.0372
12:01-13:00, Mon., 12 Feb. 0.0415 0.0354 0.0373
11:01-12:00, Mon., 12 Feb. 0.0393 0.0347 0.0366
10:01-11:00, Mon., 12 Feb. 0.0406 0.0350 0.0367
09:01-10:00, Mon., 12 Feb. 0.0394 0.0335 0.0367
08:01-09:00, Mon., 12 Feb. 0.0398 0.0344 0.0367
07:01-08:00, Mon., 12 Feb. 0.0410 0.0343 0.0368
06:01-07:00, Mon., 12 Feb. 0.0397 0.0346 0.0367
05:01-06:00, Mon., 12 Feb. 0.0405 0.0351 0.0371
04:01-05:00, Mon., 12 Feb. 0.0404 0.0342 0.0368
03:01-04:00, Mon., 12 Feb. 0.0406 0.0340 0.0368
02:01-03:00, Mon., 12 Feb. 0.0408 0.0343 0.0367
01:01-02:00, Mon., 12 Feb. 0.0408 0.0340 0.0367
00:01-01:00, Mon., 12 Feb. 0.0394 0.0346 0.0366
23:01-24:00, Sun., 11 Feb. 0.0409 0.0341 0.0368
22:01-23:00, Sun., 11 Feb. 0.0394 0.0342 0.0367
21:01-22:00, Sun., 11 Feb. 0.0388 0.0341 0.0363
20:01-21:00, Sun., 11 Feb. 0.0408 0.0346 0.0370
19:01-20:00, Sun., 11 Feb. 0.0397 0.0350 0.0367
18:01-19:00, Sun., 11 Feb. 0.0399 0.0348 0.0369
17:01-18:00, Sun., 11 Feb. 0.0414 0.0342 0.0369
16:01-17:00, Sun., 11 Feb. 0.0395 0.0355 0.0369
15:01-16:00, Sun., 11 Feb. 0.0405 0.0348 0.0368
14:01-15:00, Sun., 11 Feb. 0.0406 0.0348 0.0372
13:01-14:00, Sun., 11 Feb. 0.0406 0.0347 0.0369
12:01-13:00, Sun., 11 Feb. 0.0407 0.0348 0.0373
11:01-12:00, Sun., 11 Feb. 0.0399 0.0347 0.0368
10:01-11:00, Sun., 11 Feb. 0.0404 0.0345 0.0368
09:01-10:00, Sun., 11 Feb. 0.0408 0.0341 0.0372
08:01-09:00, Sun., 11 Feb. 0.0406 0.0350 0.0369
07:01-08:00, Sun., 11 Feb. 0.0394 0.0352 0.0370
06:01-07:00, Sun., 11 Feb. 0.0408 0.0349 0.0369
05:01-06:00, Sun., 11 Feb. 0.0404 0.0352 0.0372
04:01-05:00, Sun., 11 Feb. 0.0414 0.0356 0.0373
03:01-04:00, Sun., 11 Feb. 0.0412 0.0342 0.0369
02:01-03:00, Sun., 11 Feb. 0.0406 0.0347 0.0369
01:01-02:00, Sun., 11 Feb. 0.0398 0.0354 0.0371
00:01-01:00, Sun., 11 Feb. 0.0403 0.0345 0.0367
23:01-24:00, Sat., 10 Feb. 0.0411 0.0340 0.0373
22:01-23:00, Sat., 10 Feb. 0.0445 0.0367 0.0400
21:01-22:00, Sat., 10 Feb. 0.0441 0.0350 0.0383
20:01-21:00, Sat., 10 Feb. 0.0404 0.0347 0.0374
19:01-20:00, Sat., 10 Feb. 0.0392 0.0335 0.0361
18:01-19:00, Sat., 10 Feb. 0.0392 0.0338 0.0364
17:01-18:00, Sat., 10 Feb. 0.0401 0.0341 0.0367
16:01-17:00, Sat., 10 Feb. 0.0398 0.0344 0.0366
15:01-16:00, Sat., 10 Feb. 0.0394 0.0348 0.0367
14:01-15:00, Sat., 10 Feb. 0.0401 0.0348 0.0368