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Measurement result of radiation level (Jul.10, 15)

Jul.10, 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 6/17/2015-6/30/2015

(1) Incinerator ash

(Bq/kg)

Water Reclamation Center131I134Cs137Cs
Tobu sludge plant ND
(<24)
170 720
Kasai ND
(<37)
610 2,200
Miyagi ND
(<28)
200 790
Shingashi ND
(<29)
160 540
Nanbu sludge plant ND
(<21)
110 480
Kita-Tama Ichigo ND
(<28)
99 410
Minami-Tama 53 25 84
Kita-tama Nigo ND
(<23)
150 510
Asakawa ND
(<14)
ND
(<28)
52
Tamagawa Joryu 19 22 87
Hachioji ND
(<17)
39 96
Kiyose ND
(<18)
27 130
  • 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
(<20)
130 550
  • "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 "< 20" means that the minimum value of the measurement is 20 Bq/kg, and "ND" means that the radioactivity concentration kneaded ash is below 20 Bq/kg. "Detection limit" is varied on samples by measurement condition.

2.Monitored data on environmental radiation levels

Sampling Date 7/5/2015-7/8/2015

(μSv/h)

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