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BORIS SRESNEVSKY
CENTRAL GEOPHYSICAL OBSERVATORY

THE STATE EMERGENCY SERVICE OF UKRAINE

WAS FOUNDED IN 1855

Diploma of the Verkhovna Rada of Ukraine
Diploma of the Verkhovna Rada of Ukraine
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BORIS SRESNEVSKY
CENTRAL GEOPHYSICAL OBSERVATORY

THE STATE EMERGENCY SERVICE OF UKRAINE

WAS FOUNDED IN 1855

Diploma of the Verkhovna Rada of Ukraine
Diploma of the Verkhovna Rada of Ukraine

Radiation situation in Ukraine

   Since 2016, the Hydrometeorological Service of Ukraine has been participating in the EURDEP (European Radiological Data Exchange Platform), a unified information exchange system.
Follow the link https://remap.jrc.ec.europa.eu/GammaDoseRates.aspx you can get information about gamma radiation levels in real time

Radiacia2022

Map of the location of the Hydrometeorological Service observation points for radioactive contamination of the environment

WEATHER CONDITIONS AND RADIOACTIVE CONTAMINATION OF ATMOSPHERIC AEROSOLS IN UKRAINE IN FEBRUARY 2024.

February was warm: the average monthly air temperature exceeded the norm by 4-6.9°, thus, February corresponded to a typical March in terms of temperature.

Precipitation was mostly 1-2 times normal, with only the southern regions experiencing a deficit of 21-78% of normal, and in some places 1-10%.

The concentration of radioactive aerosols in the surface air layer in February remained at seasonally low level, which was largely facilitated by weather conditions for most of February (frequent precipitation in the form of rain and sleet, occasional snow cover formation). Only at the end of the month, with the establishment of anticyclonic weather, accompanied by winds of up to 15-20 m/s, conditions were created for the development of secondary wind lift and transfer of polluted particles, which led to a slight increase in total beta activity in the surface atmosphere.

The average concentration of beta-active aerosols at the observation sites was in the range of 5.8×10-5-16.2×10-5 Bq/m3, with the national average being 8.8×10-5 Bq/m3 (7.6×10-5 Bq/m3 in January). The concentration of anthropogenic cesium-137 in the surface air layer at the monitoring sites outside the Exclusion Zone ranged from 0.02×10-5 to 0.5×10-5 Bq/m3 with an average value of 0.09×10-5 Bq/m3 (in January 0.10×10-5 Bq/m3). At the Chornobyl control point (Exclusion Zone), the concentration of cesium-137 in the second half of the month was 0.3×10-5 Bq/m3 (0.33×10-5 Bq/m3 in the previous month).

 The volumetric activity of cosmogenic beryllium-7 in airborne aerosols ranged from 140×10-5 to 457×10-5 Bq/m3.

No abnormal radionuclides were observed in the samples. No exceedances of the permissible concentrations of radionuclides in the air established by the State Hygienic Standards NRBU-97 (0.8 Bq/m3 for cesium-137) were registered in February 2024 on the territory of Ukraine by the Hydrometeorological Service.

RADIOACTIVE CONTAMINATION OF ATMOSPHERIC PRECIPITATION IN UKRAINE IN JANUARY 2024.

Indicators of radioactive contamination of atmospheric deposition in Ukraine in January were close to the level of the previous month. The monthly average intensity of beta-active fallout at the observation sites of the radiometric network was in the range of 1.5-1.9 Bq/m2 per day, the average density of beta-active fallout in the country was 1.7 Bq/m2 per day, as in the previous month. No cases of exceeding the established control levels of total beta activity of fallout (110 Bq/m2 per day) were recorded; the highest activity of beta-emitting radionuclides in fallout (6.4 Bq/m2 during the exposure period) was observed in the sample taken on January 01-02 at the Chornobyl control point.

The content of anthropogenic cesium-137 in atmospheric deposition at most control points was in the range of 0.1-0.7 Bq/m2 per month with an average value of 0.27 Bq/m2 per month (which corresponds to the December figures). In the area of guaranteed voluntary resettlement, the content of cesium-137 in fallout did not exceed 0.6 Bq/m2 per month at Korosten meteorological station and 0.7 Bq/m2 per month at Ovruch meteorological station. In the exclusion zone (Chornobyl meteorological station), the total monthly density of cesium-137 deposition in January was less than 0.5 Bq/m2.

Deposition density of cosmogenic beryllium-7 in Ukraine ranged from 21 to 175 Bq/m2 per month.

The density of radioactive fallout in the areas of influence of operating NPPs was within the range of long-term fluctuations. No noticeable impact of NPP activities on radioactive contamination of the environment was detected by the Hydrometeorological Service.

No abnormal radionuclides were detected in atmospheric precipitation samples during the month.

 

RADIOACTIVE CONTAMINATION OF SURFACE WATERS IN UKRAINE IN FEBRUARY 2024

February 2024 was the warmest on record in most of the country's river basins. On the flat territory of the country, 37-65 mm of precipitation fell during the month (1.25-1.76 monthly norms), snow cover was absent in most basins at the end of the month, ice on the country's rivers melted and only localized banks remained. Due to the development of flood processes during the month, a gradual increase in water content was observed on the main rivers that form the inflow to the Kyiv and Kaniv reservoirs.

In the Dnipro basin upstream of Kyiv, February was much warmer than the climatic norm and with above-normal precipitation (51 mm, 150% of the norm). Under these conditions, flooding began on the rivers of the lower part of the catchment on February 3-14 amid high water levels. As of the morning of February 29, water levels on the main rivers in the catchment area were as follows: Upper Dnipro (Nedanchycha), Prypiat (Chornobyl zone) are close to and 0.2-0.3 m lower than the average long-term maximum flood levels, and the Desna is 0.2-1.65 m lower than the average.

On the main rivers of the Dnipro basin upstream of Kyiv, since the beginning of the flood, water content has increased: on the Dnipro (Nedanchycha) by 1.4 times, during the inflow to the Kyiv reservoir by 1.8 times: from 1621 m3/s (February 5) to 2920 m3/s (February 29); the Desna flow at the Letky post, which determines the lateral inflow to the Kaniv reservoir, by 1.4 times.

The Prypiat River, which is the main polluter of Dnipro waters with radionuclides of Chornobyl origin, experienced fluctuations in water levels in February due to ice jams, with a general upward trend. In general, the water level at the Chornobyl gauging station increased by 54 cm during the month, and the water flow increased from 685 m3/s to 1320 m3/s.

According to the observations of the SSE "Ecocenter", 137Cs activity concentrations in the water of the Pripyat River in the Chornobyl site in February remained at the level of the previous month and averaged 25.1 Bq/m3 in solution and 10.3 Bq/m3 on suspended sediments. The 90Sr activity concentration in February slightly decreased compared to January and averaged 49.8 Bq/m3.

The 90Sr activity concentration in the water of the Kyiv Reservoir in early February was also slightly lower than in January and amounted to 20.3 Bq/m3. Due to dilution with cleaner Desna water, 90Sr activity continued to decrease downstream and amounted to 16.0 Bq/m3 in the upper part of the Kaniv reservoir in the Kyiv section and 12.8 Bq/m3 in the lower part of the reservoir in the Kaniv HPP section.

The activity of total 137Cs in the water of the Kyiv (Vyshhorod) and upper part of the Kaniv (Kyiv) reservoirs increased in February. Kyiv) reservoirs in February increased by 15-18 % compared to January and amounted to 12.6 Bq/m3 in solution in the upper part of the Kyiv HPP and 0.6 Bq/m3 on suspended sediments; in the area of Hydropark (Kyiv), 137Cs activity in solution was 11.2 Bq/m3 and 2.2 Bq/m3 on suspended sediments.

In the area of the upper Kanivska HPP, the 90Sr activity concentration in February slightly increased compared to January and amounted to 12.8 Bq/m3. The activity concentration of 137Cs in this section of the Dnipro River in the dissolved state was 2.0 Bq/m3, and on suspended sediments was 0.9 Bq/m3.

In the first half of February 2024, the concentration of radionuclides in the water of the Desna River remained close to the level of the previous month. The activity concentrations of 137Cs in dissolved and suspended sediments in the Desna water were 0.5 and 0.3 Bq/m3, respectively; the activity concentration of 90Sr was 4.4 Bq/m3.

In the first half of February, the Ukrainian section of the Danube saw a slight decrease in the previous flood wave by 0.2-0.6 meters, while the second half of the month saw low flooding with an amplitude of up to 0.5 meters, without any negative consequences. The average monthly water consumption in Izmail in February decreased by 17% compared to January and amounted to 3920 m3/s (115% of the norm).

In February, the concentration of 90Sr activity in the Danube water near Izmail decreased by 30% compared to the previous month and amounted to 6.6 Bq/m3. The activity of 137Cs in the Danube water in the dissolved state did not exceed 0.8 Bq/m3, and on suspended sediments was less than 0.7 Bq/m3, which corresponds to the current background level.

No exceedances of permissible (according to NRBU-97) radionuclide concentrations in controlled water bodies of Ukraine in February 2024 were registered by the Hydrometeorological Service. There were no signs of radioactive waste discharge from NPPs located in the Desna and Danube basins.

RADIATION SITUATION IN THE AREAS WHERE NPPS ARE LOCATED

Exposure dose rate of gamma radiation (μR/h) in the areas of NPP location as of 08 a.m. on March 29, 2024.

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