Monitoring of ecological and radiation state of soils of the northern forest-steppe of the Kurgan Region was carried out by specialists of FSFEI SAS “Shadrinskaya” in the period from 1993 to 2016 in seven administrative regions with the terri-tories included to the zone of radioactive pollution after the accident at “Mayak” production associa-tion. During the period from 1993 to 2016 essential decrease in the intensity of radiation background from 13 to8 μR/h was observed. In 1993-1995 the average level of radiation pollution of soils with strontium-90 was estimated as average, on caesi-um-137 as minimum. In 2016 average level of radi-ation pollution was estimated as minimum. Thus the activity of long-living isotopes of strontium-90 and caesium-137 in grain, straw and grasses se-lected in reference points on the territory of Kar-gapolsky, Mishkinsky, Shadrinsky, Shatrovsky, Shumikhinsky areas did not exceed admissible lev-els. In Dalmatovsky and Kataysky areas it the ex-cess of admissible limits according to the content of strontium-90 in the grasses growing in the flood-plain of the Techa River in which waters after the accident the dumping of radioactive materials took place was revealed. The content of strontium-90 made 7.6-17.1 maximum concentration limits. In soils the ratio of Sr/Cs made 0.4-2.5 units whereas upon transition to grasses this ratio increased to 118.6-309.1. High affinity of strontium-90 to bioge-nous element to calcium leads to its essential ab-sorption by plants. So, the coefficient of accumula-tion of caesium-137 did not exceed 0.075 whereas for strontium-90 this indicator varied in the range from 5.893 to 9.958.
ecological and radiation state of soils, cesium-137, strontium-90, accumulation coef-ficient, gamma background
1. Kobyakova T.I. Ekologicheskaya ocenka poverhnostnyh, podzemnyh vod i snezhnogo pokrova Severo-Zapadnoy tehnogennoy provincii Kurganskoy oblasti: avtoref. dis.. kand. biol. nauk: 03.00.16 / Ural. gos. s.-h. akad. - Ekaterinburg, 2005. - 22 s.
2. Kotchenko S.G., Skipin L.N., Zaharova E.V. [i dr.]. Issledovanie vliyaniya radiacii na sostoyanie pochv // Agrar. vestn. Urala. - 2017. - № 4 (158). - S. 37-42.
3. Molchanova I.V. Tehnogennye radionuklidy v pochvah Vostochno-Ural'skogo radioaktivnogo sleda i ih nakoplenie rasteniyami razlichnyh taksonomicheskih grupp // Radiacionnaya biologiya. Radioekologiya. - 2014. - T. 54. - № 1. - S. 77-84.
4. Timofeev I.V., Kuz'menkova N.V. Prostranstvennoe raspredelenie 137Cs v pochvah g. Ozersk (Chelyabinskaya oblast') // Vestn. Moskov. un-ta. Ser. 5. Geografiya. - 2013. - № 6. - S. 23-29.
5. Fedotova A.S. Tehnogennoe radioaktivnoe zagryaznenie senokosnyh biogeocenozov agrarnyh landshaftov lesostepnoy zony Krasnoyarskogo kraya // Vestnik KrasGAU. - 2009. - № 5. - S. 75-81.
6. Veterinarno-sanitarnye trebovaniya k radiacionnoy bezopasnosti kormov, kormovyh dobavok, syr'ya kormovogo. Dopustimye urovni soderzhaniya 90Sr i 137Cs. Veterinarnye pravila i normy. VP 13.5.13/06-01 / utv. Minsel'hozom RF 19.12.2000. - M., 2001.
