11/03/24 10:39:58.85 IvoKQG6a0
WHO SITREP NO 14
Japan earthquake and tsunami Situation Report No. 14
23 March 2011
URLﾘﾝｸ(www.who.or.jp)
p14
The Nuclear Safety Commission of Japan, a unit of the Government of Japan established
the guideline value for restriction for intake of drinking water as:
I-131 300Bq/kg
Cesium-134, -137 200Bq/kg
WHOによると、この↑日本政府の暫定規制値は国際的な基準より厳しいものらしい
それとI-131は低比放射性物質(low specific activity)なので放射線のソースとはならないとも
核種ごとの国際的な基準は
I-131 3,000Bq/kg、
Cs-134 1,000Bq/kg
Cs-137 2,000 Bq/kg)
It should also be noted that the Japanese guideline value is an order lower than the internationally agreed
Operational Intervention Levels (OIL's) for I-131 (3,000 Bq/kg), Cs-134 (1,000 Bq/kg) and Cs-137 (2,000 Bq/kg).
Iodine-131 is not a significant source of radiation because of its low specific activity
(ref. IAEA General Safety Guide No. 2)
URLﾘﾝｸ(www-pub.iaea.org)
これ↑のp41以下
TABLE 10. DEFAULT RADIONUCLIDE SPECIFIC OILs FOR FOOD, MILK AND WATER CONCENTRATIONS FROM LABORATORY ANALYSIS
に放射性核種ごとの暫定規制値が載ってる
＊低比放射性物質(LSA：Low specific activity material)とは比放射能が低いため
吸入により重大な放射線障害を引き起こすことが考えられない核種