Tritium contamination of surface and ground waters at the “Dnepr” peaceful underground nuclear explosions site

The article presents results of a study on the tritium content in surface and ground waters in the area of peaceful underground nuclear explosions of the “Dnepr” series. Low-yield thermonuclear explosions (1.8–2.1 kt of TNT equivalent) were carried out inside Mount Kuel’por (Khibiny Massif, Kola Peninsula, Murmansk Oblast, the Russian Federation) in 1972 and 1984. The purpose of the explosions was to crush the ore body (apatite minerals), followed by the extraction of the crushed rock to the ground surface. The main long-term problem generated by these explosions was the flow of tritium-contaminated groundwater onto the ground surface. The area where the explosions took place is actively visited by tourists. Water from local reservoirs, in particular from the Kuniyok River, is used by people for drinking. The purpose of this study was to assess the drinkability of the local waters in terms of activity concentration of tritium. To achieve this goal, 35 water samples were taken in 2019 from wells, boreholes, rivers, streams, lakes and other accessible environmental waterbodies. Activity concentration of tritium in the samples was determined using the Quantulus 1220 low-background liquid scintillation spectrometer. The activity concentration of tritium in the water samples was in a rather wide range: from less than 2 Bq/kg up to 1510 Bq/kg. The maximum value was up to three orders of magnitude higher than the regional background level of approximately 2 Bq/kg. At the same time, the maximum activity concentration was significantly lower compared to the intervention level for drinking water (7600 Bq/kg, according to Sanitary Norms and Rules of the Russian Federation). Based on the results of this study and data obtained by other researchers earlier, it became possible to assess the half-time for decrease of activity concentration of tritium in surface and ground waters in the period 2008–2019. The mean value (± standard error of the mean) of the effective half-time of tritium in water from the mine, the boreholes, and the Kuniyok River was estimated as 4.4 ± 0.2 year. The decrease in activity concentration of tritium in water depended more on ecological processes (dilution with “pure” water) than on physical decay of the radionuclide. In 2019, the estimated value of the effective dose due to ingestion of tritium in drinking water from the Kuniyok River was 0.17 μSv; this was negligible compared to the dose limit of 1 mSv per year for the public.

1. UNSCEAR – United Nations Scientific Committee on Atomic Radiation. 2000 REPORT, Sources and Effects of Ionizing Radiation. United Nations, New York; 2000. Vol. 1.

2. UNSCEAR – United Nations Scientific Committee on Atomic Radiation. 2016 Report, Sources, Effects and Risks of Ionizing Radiation, Annex C – Biological Effects of Selected Internal Emitters – Tritium. United Nations, New York; 2017.

3. Eyrolle F, Ducros L, Le Dizès S, Beaugelin-Seiller K, Charmasson S, Boyer P, Cossonnet C. An updated review on tritium in the environment. Journal of Environmental Radioactivity. 2018;181: 128–137. DOI: 10.1016/j.jenvrad.2017.11.001.

4. Standards and Guidelines for Tritium in Drinking Water. Minister of Public Works and Government Services, Canada. 2008. Available on: https://nuclearsafety.gc.ca/pubs_catalogue/uploads/info_0766_e.pdf. [Accessed 23.10.2021].

5. Makhon’ko KP, Kim VM, Katrich IY, Volokitin AA. Comparison of the behavior of tritium and 137Cs in the atmosphere. Atomnaya Energiya = Atomic Energy. 1998;85(4): 313–318. (In Russian).

6. The Radiation Situation on the Territory of Russia and Neighboring States in 2019. Yearbook. NPO Typhoon. Obninsk; 2020. (In Russian). Available on: http://egasmro.ru/files/documents/ro_ezhegodniki/ezhegodnik_ro_2019.pdf. [Accessed 23.10.2021].

7. Matsumoto H, Shimada Y, Nakamura AJ, Usami N, Ojima M, Kakinuma S, et al. Health effects triggered by tritium: how do we get public understanding based on scientifically supported evidence? Journal of Radiation Research. 2021;62(4): 557–563. DOI: 10.1093/jrr/rrab029.

8. “Fukushima-1” NPP Accident: Radiological Consequences and Lessons. Ed. by acad. of RAS G.G. Onishenko and prof. A.Yu. Popova. St. Petersburg: Research Institute of Radiation Hygiene after prof. P.V. Ramzaev; 2021. 388 p. (In Russian). Available on: http://www.niirg.ru/PDF/2021/F1_2021.pdf. [Accessed 23.10.2021].

9. Atlas of the East Ural and Karachay Radioactive Trace Including Forecast up to 2047. Editor-in-chief Yu.A. Izrael. Moscow: IGCE Roshydromet and RAS, «Infosphere» Foundation; 2013. 140 p. (In Russian). Available on: http://downloads.igce.ru/publications/Atlas/CD_VURS/index.html. [Accessed 23.10.2021].

10. Chebotina MYa, Nikolin OA, Bondareva LG, Rakitsky VN. Tritium in urine of people living in the area of influence of the Beloyarskaya NPP. Radiatsionnaya Gygiena = Radiation Hygiene. 2016;9(4): 87–92. (In Russian). DOI: 10.21514/1998-426X-2016-9-4-87-92.

11. Finashov LV, Vostrotin VV, Yanov AYu. Tririum in urine in residents of Ozyorsk, the Chelyabinsk region in 2016. Radiatsionnaya Gygiena = Radiation Hygiene. 2019;12(3): 42–49. (In Russian). DOI: 10.21514/1998-426X-2019-12-3-42-49.

12. Panov AV, Trapeznikov AV, Korzhavin AV, Geshel IV, Korovin SV, Edomskaya MA. Radiation monitoring of drinking water in the vicinity of the Beloyarsk NPP. Radiatsionnaya Gygiena = Radiation Hygiene. 2021;14(1): 86–101. (In Russian). DOI: 10.21514/1998-426X-2021-14-1-86-101.

13. Nuclear Legacy Problems and Ways to Solve Them. Under the general editorship of E.V. Evstratova, A.M. Agapova, N.P. Laverova, L.A. Bolshova, I.I. Linge. 2012. 356 p. Available on: http://en.ibrae.ac.ru/docs/Monografii/yadern_nasledie_t1%20sq.pdf. [Accessed 23.10.2021].

14. Nordyke MD. The Soviet program for peaceful uses of nuclear explosions. Science and Global Security. 1998;7: 1–117. Available on: https://scienceandglobalsecurity.org/archive/sgs07nordyke.pdf. [Accessed 01.12.2021].

15. Peaceful Nuclear Explosions: Guarantees of General and Radiation Safety. Ed. by prof. V.A. Logachev. Moscow: Izd.AT; 2001. 519 p. (In Russian).

16. Ramzaev VP, Repin VS, Khramtsov EV. Peaceful underground nuclear explosions: current issues on radiation safety for general public. Radiatsionnaya Gygiena = Radiation Hygiene. 2009;2(2): 27–33. (In Russian).

17. Timofeeva MA, Barkovsky AN, Medvedev AYu, Ramzaev VP, Repin VS. On including the data relevant to peaceful nuclear explosions in the radiation hygiene passport of a territorial subject of the Russian Federation. Radiatsionnaya Gygiena = Radiation Hygiene. 2010;3(3): 51–54. (In Russian).

18. Vasiliev AP. Nuclear explosive technologies for peaceful nuclear explosions In: Zababakhinskie Scientific Readings: Collection of Materials of the XIII International Conference (March 20–24, 2017). Snezhinsk; 2017. P. 10. (In Russian). Available on: http://vniitf.ru/data/images/zst/2017/section_0/2_vasiliev_plenar_en.pdf. [Accessed 23.10.2021].

19. Yablokov AV. The Myth about the Safety and Effectiveness of Peaceful Underground Nuclear Explosions. Moscow: TsEPR; 2003. 176 p. (In Russian). Available on: https://www.yabloko.ru/books/mif_6.pdf. [Accessed 21.11.2021].

20. Kasatkin VV, Mamonov BP, Kasatkin AV. Radiation monitoring of the “DNEPR” nuclear explosion facility after its conservation (decommissioning). V International Nuclear Forum – Nuclear Technology Safety: Safety Strategy and Economics. St. Petersburg, September 27 – October 01, 2010. (In Russian). Available on: https://www.atomic-energy.ru/presentations/18978. [Accessed 23.10.2021].

21. Kochetkov OA, Monastyrskaya SG, Kabanov DI. Problems of anthropogenic tritium limitation (review). Saratov Journal of Medical Scientific Research. 2013;9(4): 815–818. (In Russian).

22. The Modern Radioecological Situation at the Sites of Peaceful Nuclear Explosions on the Territory of the Russian Federation. Ed. by prof. V.A. Logachev. Moscow: Izd.AT; 2005. 256 p. (In Russian). Available on: http://elib.biblioatom.ru/text/sovremennaya-radioekologicheskaya-obstanovka-rf_2005/go,0/ [Accessed 05.12.2021].

23. Khramtsov EV, Varfolomeeva KV, Zelentsova SA, Arkhangelskaya GV, Repin VS, Vishnyakova NM. Objective and subjective in an assessment of the danger of the consequences of peaceful nuclear explosions on the example of facility «Dnepr». Radiatsionnaya Gygiena = Radiation Hygiene. 2015;8(1): 35–44. (In Russian).

24. Search according to the State Water Register. Available on: https://textual.ru/gvr/index.php?card=155543 [Accessed 21.12.2021].

25. Shevchenko A. Precipitation in Khibiny. Available on: http://hibtravel.ru/rain.html [Accessed 21.12.2021].

26. Mazukhina SI, Maksimova VV, Chudnenko KV, Masloboev VA, Sandimirov SS, Drogobuzhskaya SV, et al. Water Quality in the Arctic Zone of the Russian Federation: Physical and Chemical Modeling of Water Formation, Forms of Migration of Elements, Impact on the Human Body. Apatity: Publishing House of the Federal Research Center of the KSC RAS; 2020. 158 p. (In Russian). Available on: https://inep.ksc.ru/documents/51_mazukhina_20.pdf. [Accessed 21.11.2021].

27. Arun B, Vijayalakshmia I, Sivasubramaniana K, Jose MT. Optimization of liquid scintillation counter for tritium estimation in water samples. Radiochemistry. 2019;61(1): 61–65. DOI: 10.1134/S1066362219010090.

28. Jones FE, Harris GL. ITS-90 Density of water formulation for volumetric standards calibration. Journal of Research of the National Institute of Standards and Technology. 1992;97(3): 335–340. DOI: 10.6028/jres.097.013.

29. Barkovsky AN, Akhmatdinov RR, Akhmatdinov RR, Baryshkov NK, Biblin AM, Bratilova AN, et al. Information Bulletin: Radiation Doses in Russia, 2019. St. Petersburg Research Institute of Radiation Hygiene after prof. P.V. Ramzaev: St. Petersburg; 2020. (In Russian). Available on: http://www.niirg.ru/PDF/inf_sbor/2019.pdf. [Accessed 21.11.2021].