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Tokai JCO Criticality Accident

Report [4] 10/11/99 18:00

Radioactive materials detected

Date

Source of info.

Radioactive materials

Amount

Oct. 1

Tokyo Evening News

cesium 138 (xenon 138)

not reported

Oct. 2

Mainichi Evening News

barium139,

not reported

strontium 91 (krypton 91)

not reported

cesium 137

a minute amount

Oct. 2

Asahi Evening News

sodium 24(300m west of the site)

64Bq/kg

sodium 24 (3 km west of the site)

1.7Bq/kg

cesium 137

a minute amount

Oct. 3

Mainichi News

sodium 24 (3 km west of the site)

1.7Bq/kg

cesium 137

a minute amount

Oct. 4

Kyodo News

strontium 91(in the atmosphere of an area 900m south-east of the site)

0.021Bq/m3

Oct. 4

TBS (NEWS23)

iodine 131 (from leaves of a mugwort plant and soil)
(Mr. Koide of Kyoto University Research Reactor Institute)

54.7 Bq/kg

iodine 133 (leaves of a mugwort plant)
(Mr. Koide of Kyoto University Research Reactor Institute)

not reported

Oct. 5

Mainichi News

iodine 131 (from leaves of a mugwort plant and soil)

23 to 55Bq/kg

iodine 133 (leaves of a mugwort plant)

not reported

Oct. 5

Asahi News

iodine 131 (from leaves of a mugwort plant and soil)
(found by Mr. Koide of Kyoto University Research Reactor Institute on Oct. 2nd at an area 100m away of the site.)

54.7 Bq/kg

iodine 133 (leaves of a mugwort plant)
(found by Mr. Koide of Kyoto University Research Reactor Institute on Oct. 2nd at an area 100m away of the site.)

not reported

xenon 139 (from the hospitalized workers’ vomit.)

not reported



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