Tension breaking strength of common reed leaves was studied. Samples of leaves were taken in six aquatic ecosystems in the Chernobyl exclusion zone. In the samples of leaves, the specific activity of ⁹⁰Sr and ¹³⁷Cs was measured, as well as the accumulation of macro elements of the plant’s mineral nutrition. According to the measurement results, the doses of internal radiation from the incorporated radionuclides were calculated. A close statistical relationship was established between the tensile breaking strength of the leaves with respect to their radiation exposure and the reciprocal statistical relationship of irradiation dose to the accumulated leaves to macroelements. It is shown that the tensile breaking strength of the leaves is mainly influenced by the irradiation dose from incorporated ¹³⁷Cs in the leaves. The data obtained show that the damaging effect of ionizing radiation leads to an increase in the tensile breaking strength of the leaves, and the enrichment with macroelements of mineral nutrition has a radioprotective effect. The results of statistical analysis indicate that the tensile breaking strength of common reed leaves can be considered a reliable test when assessing the irradiation dose of internal exposure from incorporated radionuclides.

1. Д. Ганжа, О. Назаров, “Вплив хронічного радіаційного опромінення на жилкування та розташування продихів у листках Phragmites australis (Cav.) Trin. ex Steud,” Вісник Львівського університету, Випуск 69, Львов, Украина, 2015. (D. Ganzha, O. Nazarov, “Influence of chronic radiation exposure on the housing and location of stomata in the leaves Phragmites australis (Cav.) Trin. ex stoud,” Bull. University of Lviv, no. 69, Lviv, Ukraine, 2015.)
   Retrieved from: http://prima.franko.lviv.ua/faculty/biologh/wis/69/6/14/14.pdf
   Retrieved on: Apr. 21, 2019
2. Д. Д. Ганжа, А. Б. Назаров, “Изменение механических характеристик листьев тростника обыкновенного под влиянием хронического радиационного облучения,” в Материалы Биологические эффекты малых доз ионизирующей радиации и радиоактивное загрязнение среды, Сыктывкар, Россия, 2014, стр. 210 – 214. (D. D. Ganja, A. B. Nazarov, “Changes in mechanical characteristics in phragmites communis resulted from radioactive irradiation chronic effect,” in Proc. Int. Conf. Biol. Eff. Low Dose Ioniz. Radiat. Radioact. Pollut. Environ., Syktyvkar, Russia, 2014, pp. 210 – 214.)
   Retrieved from: https://ib.komisc.ru/add/conf/biorad/wp-content/uploads/2014/01/material_biorad_2014.pdf
   Retrieved on: Jun. 15, 2019
3. M. T. Максимов, Г. О. Оджагов, Радиоактивные загрязнения и их измерение, Изд. 2, Москва, Россия: Энергоатомиздат, 1989. (M. T. Maksimov, G. O. Odjagov, Radioactive contamination and their measurement, 2nd ed., Moscow, Russia: Energoatomizdat, 1989.)
   Retrieved from: https://urss.ru/cgi-bin/db.pl?lang=Ru&blang=ru&page=Book&id=111343
   Retrieved on: Mar. 30, 2019
4. J. Brown, P. Strand, A. Hosseini, P. Børretzen, Handbook for Assessment of the Exposure of Biota to Ionising Radiation from Radionuclides in the Environment, European Commission, Brussels, Belgium, 2003.
   Retrieved from: https://wiki.ceh.ac.uk/download/attachments/115802176/fasset_d5.pdf%3Fversion%3D1%26modificationDate% 3D1263905014000
   Retrieved on: Oct. 6, 2019
5. Корма. Методы определения аммиачного азота и активной кислотности (рН), ГОСТ 26180-84, Aпр. 29, 1984. (Fodder. Determination of ammonia nitrogen content and actual acidity), GOST 26180–84, Apr. 29, 1984.)
   Retrieved from: http://docs.cntd.ru/document/1200024363
   Retrieved on: Sep. 9, 2019
6. Бумага и картон. Методы определения влагопрочности (с Изменениями N 1, 2), ГОСТ 13525.7-68, Июл. 5, 1968. (Paper and board. Methods for determination of wet strength, GOST 13525.1-68, Jul. 5, 1968.)
   Retrieved from: http://docs.cntd.ru/document/1200018216
   Retrieved on: Dec. 21, 2018
7. D. Ganzha, Ch. Ganzha, A. Nazarov, B. Sploshnoi, “Specifics of using phragmites australis for holding a radioecological monitoring,” in Proc. 3rd Int. Con. Radiation and Applications in Various Fields of Research (RAD2015), Budva, Montenegro, 2015, pp. 257 - 262.
   Retrieved from: http://www.rad-conference.org/proceedings.php
   Retrieved on: Sep. 13, 2019
8. Evaluation of measurement data — Guide to the expression of uncertainty in measurement, 1st ed., JCGM, Paris, France, 2008.
   Retrieved from: https://www.bipm.org/utils/common/documents/jcgm/JCGM_100_2008_E.pdf
   Retrieved on: Jul. 13, 2019