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Tokai JCO Criticality Accident

Report [22]12/8/99 15:00

Radioactive materials detected[2]

 Source: Data released from the second meeting of the Uranium Conversion Facility Plant Criticality Accident Investigation Committee of the Nuclear Safety Commission

Sample Number of measured samples  Number of samples with radio-nuclides  Radio-nuclides  Half-life Concentration level  Collected Date/Time Distance 
Dust in the Atmosphere 57 9 1 Strontium 91  9.63h 2.1*10-8 [Bq/cm3 9/30(0:00)- 10/1(13:00)  about 1km 
8 Cesium 138  32.2m 1.6*10-8 - 1.4*10-3 [Bq/cm3 9/30(15:00- 23:00)  about 100m- 3km 
Iodine in the Atmosphere 42 7 2 Iodine 133  20.8h 3.6*10-7- 3.9*10-7 [Bq/cm3 9/30(17:00- 20:00)  about 100m 
2 Iodine 135  6.57h 1.6*10-6- 3.4*10-6 [Bq/cm3 9/30(17:00- 20:00)  about 100m 
3 Cesium 138  32.2m 9.2*10-6- 1.4*10-5 [Bq/cm3 9/30(17:00- 20:00)  about 100m 
Rain water  3 0
Tap water  17  0
Well Water  31 0
Lake/swamp water  3 0
Soil 138 108 16 Sodium 24  14.96h 1.3*10-3- 1.3*10-1 [Bq/g]  10/2(12:00)- 10/3(16:00)  80m- 3km 
2 Manganese56  2.58h 3.7*10-2- 1.0*10-1 [Bq/g]  9/30(17:00)  about 100m 
1 Iodine 131  8.04d 4.5*10-4[Bq/g]  10/3(16:00)  about 100m 
1 Iodine 133  20.8h 1.6*10-3[Bq/g]  10/3(16:00)  about 100m 
88 Cesium 137  30.1y 1.4*10-3- 2.6*10-2 [Bq/g]  9/30(15)- 10/10(16:00)  130m- 6km 
Agricultural products  115 21  121) Iodine 131  8.04d 9.5*10-4- 3.7*10-2 [Bq/g]  10/2(15:00)- 10/10(15:00)  80m- 2km 
72) Iodine 133  20.8h 3.9*10-3- 3.8*10-2 [Bq/g]  10/2(14:00)- 10/5(10:00)  50m- 2km 
2 Iodine 135  6.57h 1.3*10-2- 1.4*10-2 [Bq/g]  ? 2km 
Animal products  19(0)  0
Marine products  12(0)  0
Sea water  7(0)  0

1) Chinese cabbage, leafy vegetables, egg plant leaves, leaves of sweet potato plants, mixed leaves, leaves of mugwort plant
2) Chinese cabbage, leafy vegetables, weeds


The government has so far set an intake limit on only three radionuclides: iodine, cesium, and plutonium (standards for cesium and plutonium intake were set following the Chernobyl accident).  CNIC believes that the limits should be higher, however, we are listing below the government’s intake limit standards for reference.

Object

Radioactive Iodine ( The figures here are for I-131 which has been set as a representative of all radioactive Iodine).

Drinking water

above 3*102 Bq/kg

Milk, Dairy products

Vegetables excluding root vegetables

above 2*103 Bq/kg

 

Object

Radioactive Cesium

Drinking water

above 2*102 Bq/kg

Milk, Dairy products

Vegetables

above 5*102 Bq/kg

Grains

Meat, eggs, fish, etc.

 

Object

Plutonium, alpha nuclides of the transuranic elements

Drinking water

above 1 Bq/kg

Milk, Dairy products

Vegetables

above 10 Bq/kg

Grains

Meat, eggs, fish, etc.



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