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Yamashita H, Nishina Y, Komori N, Kamoshita M, Oya Y, Okuno K, Morita A, Ikka T. Cesium uptake and translocation from tea cutting roots (Camellia sinensis L.). JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2021; 235-236:106655. [PMID: 34034207 DOI: 10.1016/j.jenvrad.2021.106655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 05/13/2021] [Accepted: 05/15/2021] [Indexed: 06/12/2023]
Abstract
To estimate the uptake of radiocesium (137Cs) by tea plant roots, 1-year-old rooted tea cuttings (Camellia sinensis L. cv. Yabukita) at the time of bud opening were cultivated hydroponically for 27 days in pots containing nutrient solutions with or without 137CsCl (600 Bq mL-1). Total 137Cs radioactivity of whole tea plants were 6.1 kBq g-1 dry weight. The plant/solution 137Cs transfer factors of different tissues were in the range of 2.6 (in mature leaves) to 28.2 mL g-1 dry weight (in roots), which were lower than those reported in wheat and spinach. In total, 69% of 137Cs remained in roots and 31% was transported from roots to shoots. The results indicated that 137Cs was preferentially translocated to new shoots, which are used for manufacturing tea, over mature leaves.
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Affiliation(s)
- Hiroto Yamashita
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan; United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagito, Gifu, 501-1193, Japan
| | - Yoshifumi Nishina
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Naho Komori
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Mizuho Kamoshita
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Yasuhisa Oya
- Radioscience Research Laboratory, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Kenji Okuno
- Radioscience Research Laboratory, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Akio Morita
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan; Institute for Tea Science, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Takashi Ikka
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan; Institute for Tea Science, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan.
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Živković M, Zlatić N, Krstić D, Stanković M. Health risk assessment of natural and artificial radionuclides in medicinal plants. KRAGUJEVAC JOURNAL OF SCIENCE 2021. [DOI: 10.5937/kgjsci2143015q] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
In the present work, we determined activity concentrations of ten Medicinal herbs using gamma spectrometry. The radioactivity concentration of 226 Ra, 232 Th, 40 K and 137 Cs were 2.82, 0.63, 984.32, 0.28 Bq/kg, respectively. These doses are not hazardous to the general public's health. The mean values of radium equivalent activity (Raeq), absorbed dose rates (D), annual effective dose (De) and external hazard index (Hex) are 79.51 Bq/kg, 42.73 nGy-1 , 52.40 µSv and 0.21, respectively. Medicinal plants used to make tea do not contain a concentration of tested radionuclides that would cause negative consequences to one's health.
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Tagami K, Uchida S, Shinano T, Pröhl G. Comparisons of effective half-lives of radiocesium in Japanese tea plants after two nuclear accidents, Chernobyl and Fukushima. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2020; 213:106109. [PMID: 31756642 DOI: 10.1016/j.jenvrad.2019.106109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 06/10/2023]
Abstract
The time-dependence of 137Cs in new shoots of tea (Camellia sinensis (L.) Kuntze) following a137Cs-deposition was analyzed and quantified in terms of effective half-lives. The underlying monitoring studies were performed after the accidents in the Chernobyl and the Fukushima Daiichi nuclear power plants for tea plants growing in Japan. The major transfer route for atmospherically deposited radiocaesium to the first new shoots sampled after the accidents were different: for the Fukushima accident, it was mainly translocation of radiocaesium deposited onto old leaves and twigs to the new growth, while direct deposition on the new leaves was the major source after the Chernobyl accident. The effective half-lives in new tea leaves representing the fast and slow components of the decline did not significantly differ between these accidents. Geometric means (ranges) of fast and slow effective half-lives of 137Cs after the Chernobyl accident were 66 d (25-125 d) and 902 d (342-15900 d), respectively, and those after the Fukushima accident were 50 d (26-105 d) and 416 d (222-1540 d), respectively. From these results, 137Cs declines in new tea leaves were similar although contamination conditions were different for these two accidents.
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Affiliation(s)
- Keiko Tagami
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-shi, Chiba, 263-8555, Japan.
| | - Shigeo Uchida
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-shi, Chiba, 263-8555, Japan
| | - Takuro Shinano
- Research Faculty of Agriculture, Hokkaido University, Kita 9, Nishi 9, Kita-ku, Sapporo-shi, Hokkaido, 060-8589, Japan
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Zehringer M, Kammerer F, Wagmann M. Radionuclides in tea and their behaviour in the brewing process. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2018; 192:75-80. [PMID: 29890360 DOI: 10.1016/j.jenvrad.2018.06.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 05/31/2018] [Accepted: 06/02/2018] [Indexed: 06/08/2023]
Abstract
Tea plantations may be strongly affected by radioactive fallout. Tea plantations on the Turkish coast of the Black Sea were heavily contaminated by the fallout from the reactor fire at the Chernobyl nuclear power plant in 1986. Two years later, the contamination level was reduced by about 90%. When tea is brewed, the original contamination in the tea leaves is more or less leached into the tea water. While most of the radiocaesium (60-80%) is washed out by brewing, most of the radiostrontium remains in the leaves (70-80%). In food laws, a dilution factor of 40-50 is considered for tea brewing. Most laws only define limit values for radiocaesium. Radiostrontium is not specially regulated, even though its dose coefficients for ingestion are higher than the corresponding coefficients for radiocaesium. Radiostrontium in tea occurs primarily from global fallout (bomb tests from 1945-1965).
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Affiliation(s)
- Markus Zehringer
- State-Laboratory Basel-City, Kannenfeldstrasse 2, CH-4056 Basel, Switzerland.
| | - Franziska Kammerer
- State-Laboratory Basel-City, Kannenfeldstrasse 2, CH-4056 Basel, Switzerland
| | - Michael Wagmann
- State-Laboratory Basel-City, Kannenfeldstrasse 2, CH-4056 Basel, Switzerland
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