values of annual intake by consumption MLVj,ing may be used as the basis for calculating internal radiation due to the intake of radionuclides into an organism by consumption and may not be used for determining the concentration of radionuclides in drinking water and food in a working environment. For the intake of more radionuclides into an organism also exposed to external ionising radiation, the lower limit values of annual intake shall comply with the condition expressed by the following method: MLVi⋅e(g)i is the effective dose of intake of radionuclide i by consumption or inhalation, Ez,m is the effective dose limit from external radiation, Σj≠i, is the sum of all limit intakes of j radionuclides from consumption and inhalation excluding i. Article 15 (Derived concentration values) The derived concentration of an individual radionuclide in air, water or food shall be calculated as the limit value of the annual intake MLVj,inh or MLVj,ing, volume of inhaled air Vz (m3), volume of consumed water Vv (m3) or mass of consumed food mh (kg), by the following method: or or , where IK is derived concentration value. values of contamination may be the same as their derived concentration values if only one transmission path of the radionuclide in question is the cause of contamination. If an area is contaminated with different radionuclides at the same time, lower derived limit values of contamination must be determined, considering the following inequality: , where Ki is the concentration of radionuclide i in air or drinking water. Article 16 (Authorised and operative dose constraints) If, by technically possible or economically feasible measures, while considering social factors, it is not possible to provide conditions where radioactive contamination is lower than derived limit values of concentration under the preceding Article, the length of time people are exposed to ionising radiation must be reduced by determining authorised or operative dose constraints and values of radiation quantity. Authorised and operative limit values for effective dose rates Ėi,z and for derived concentration values IK are calculated by applying lower values for individual limit values (Em, MLV or Ez,m) by equations under Articles 9, 14 and 15 of this Decree as well as shorter exposure times to ionising radiation or proportionate value of inhaling contaminating air Vz, consuming contaminating water Vv or contaminated food mh. Article 17 (Limit values of air contamination)
ANNEX 4 Values of operational intervention levels (OIL) OIL are determined based on the reference level at 100 mSv. When using lower reference levels, the OIL needs to be proportionately reduced. OIL Quantity Value Measures OIL1 measurements in the environment Gamma radiation dose rate at1 m from the surface area 1000 µSv/h Immediate protective measures, with the intention of preventing deterministic radiation effects. Immediately:a distributing and consuming of iodine tabletsb immediate safe evacuation decontaminating evacueesc restricting unintentional consumptiond stopping consumption of locally produced foode, forest fruits (mushrooms, etc.), milk from freely grazing cows registration, radiological and health examination of evacuees In the first days: assessing received and of the need for medical examination, advice and continued monitoring. OIL2 measurements in the environment Gamma radiation dose rate at 1 m from the surface area: 100 µSv/h Immediate protective measure, with the intention to prevent deterministic radiation effects. Immediately: preparing for temporary relocation, restricting unintentional consumption prior to relocationd stopping consumption of locally produced food, forest fruits (mushrooms, etc.), milk from freely grazing cows, rainwater and animal feed Within a week or the first monthg registering members of the public in the area temporary relocating, starting with the most endangered assessing doses received and of the need for medical examination, advice and continued monitoring. ≤ 10 days after stopping a reactorh 100 µSv/h > 10 days after stopping a reactor 25 µSv/h a Some of the listed actions will be automatically activated when declaring a general emergency. b Cannot slow down the evacuation. c If immediate decontamination is not possible, evacuees must be advised to change clothing and take a shower as soon as possible. d Warn evacuees not to eat, drink or smoke and to keep their hands away from their mouths until they have washed. e Locally produced food includes food produced directly in a contaminated open area and consumed within a few