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Measurement result of radiation level (Oct.2, 15)

Oct.2, 2015 Bureau of Sewerage

Please be informed that Bureau of Sewerage measured current radiation level at boundary of water reclamation centers and radioactivity concentration of incinerator ash and kneaded ash.

1.Radioactivity level on incinerator ash

Sampling Date 9/10/2015-9/24/2015

(1) Incinerator ash

(Bq/kg)

Water Reclamation Center131I134Cs137Cs
Tobu sludge plant

ND
(<26)

250 940
Kasai ND
(<30)
390 1,600
Miyagi ND
(<21)
170 610
Shingashi ND
(<23)
120 450
Nanbu sludge plant ND
(<25)
130 550
Kita-Tama Ichigo ND
(<20)
79 320
Minami-Tama 42 20 95
Kita-tama Nigo ND
(<17)
110 470
Asakawa ND
(<15)
ND
(<18)
54
Tamagawa Joryu ND
(<14)
22 73
Hachioji ND
(<17)
29 130
Kiyose ND
(<14)
33 97
  • Analyzed using germanium semiconductor detector (Ge Detector)
  • ND : Not detectable
  • ( ) : Detection limit
  • "Detection limit" refers to the minimum detectable value. For example, a detection limit "<14" means that the minimum measurement is 14 Bq/kg, and "ND" means that the radioactivity concentration incinerator ash is below 14 Bq/kg. "Detection limit" is varied on samples by measurement condition.

(2) Kneaded ash

(Bq/kg)

Water Reclamation Center131I134Cs137Cs
Nanbu sludge plant ND
(<24)
180 800
  • "Kneaded ash" is water and cement added incinerator ash for landfill disposal and prevention of scattering
  • Analyzed using germanium semiconductor detector (Ge Detector)
  • ND : Not detectable
  • ( ) : Detection limit
  • "Detection limit" refers to the minimum detectable value. For example,a detection limit of "<24" means that the minimum value of the measurement is 24 Bq/kg, and "ND" means that the radioactivity concentration kneaded ash is below 24 Bq/kg. "Detection limit" is varied on samples by measurement condition.

2.Monitored data on environmental radiation levels

Sampling Date 9/27/2015-9/29/2015

(μSv/h)

Water Reclamation CenterEast SideWest SideSouth SideNorth SideCenter
Tobu sludge plant 0.07 0.07 0.06 0.06 0.08
Kasai 0.07 0.07 0.06 0.07 0.07
Miyagi 0.05 0.07 0.08 0.08 0.06
Shingashi 0.06 0.05 0.06 0.05 0.06
Nanbu sludge plant 0.05 0.05 0.06 0.07 0.04
Kita-Tama Ichigo 0.08 0.07 0.06 0.06 0.07
Minami-Tama 0.04 0.05 0.04 0.04 0.03
Kita-tama Nigo 0.08 0.04 0.08 0.08 0.09
Asakawa 0.05 0.05 0.05 0.07 0.07
Tamagawa Joryu 0.06 0.08 0.07 0.06 0.08
Hachioji 0.05 0.06 0.06 0.05 0.08
Kiyose 0.06 0.06 0.07 0.07 0.06

※ Measured at a height of 1m using scintillation survey meter at boundaries of water reclamation centers which deal with sludge treatment

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