Regulation of foodstuffs contaminated with radioactive substances after the Chornobyl NPP Accident Oleg Nasvit National Institute for Strategic Studies, Ukraine

Regulation of foodstuffs contaminated with radioactive substances after the Chornobyl NPP accident, Bq/kg(l) Product name Introduced ( 131 I) (β Σ ) ( Cs) ( Cs) ( Cs) Ukraine PL-97 ( 137 Cs) Japan, Water Special infants’ food Bread Milk Cheese Butter Meat Fish Vegetables Potato Fresh wild berries and mushrooms Dried wild berries and mushrooms Dose limits for population after Chornobyl: 1 st year – 100 mSv; 2 nd and 3 rd – 30 mSv; 4 th – 25 mSv; since 1991 – 5 mSv (internal, TPL-91)

Approach PL-97 Critical age group Permissible daily intake of RN Reference ration Reference dose structure Share of RN for each food product according to reference dose structure Permissible concentrations (PL) 100% contaminated food to PL, reference ration, 1 mSv/year for each RN ( 137 Cs, 90 Sr)

Critical age group(s) AgeAge range, years Dose conversion factors, Sv/Bq 137 Cs 90 Sr 3 months E E-07 1 year E E-08 5 years E E years E E years E E-08 Adults>171.30E E-08 Permissible daily intake: 137 Cs 210 Bq; 90 Sr 35 Bq

Reference ration and dose structure Reference ration (1990) ProductsDaily consumption, kg Potato0,359 Meat0,186 Milk1,022 Vegetables0,279 Fish0,048 Fruits0,129 Bread0,386 Eggs, ps.0,745 Total2,409 Reference dose structure Products 137 Cs 90 Sr Potato0,070,11 Meat0,210,09 Milk0,580,48 Vegetables0,040,17 Fish0,030,05 Fruits0,050,04 Bread0,020,06 Total1,00

Special infants’ food Considered separately Total annual dose (Cs+Sr) not more than 1 mSv Daily intake 137 Cs 40 Bq, 90 Sr 13 Bq Daily ration not more than 1 kg

Conservatism Age groupsIntegrated conservatism factors 137 Cs 90 Sr Adults Contributors 1.Real ration v. reference 2.Different age groups v. critical 3.Actual contamination levels distribution v. 100% PL

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