1
|
Noda Y, Yoshihara T, Suzui N, Yin YG, Miyoshi Y, Enomoto K, Kawachi N. Visualization of the initial radiocesium dynamics after penetration in living apple trees with bark removal using a positron-emitting 127Cs tracer. Appl Radiat Isot 2023; 198:110859. [PMID: 37267714 DOI: 10.1016/j.apradiso.2023.110859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 05/14/2023] [Accepted: 05/17/2023] [Indexed: 06/04/2023]
Abstract
Following the Fukushima nuclear accident in March 2011, radiocesium (rCs) contamination in deciduous trees remains over 10 years later even though the trees were leafless at the time of the accident. This phenomenon is considered to be the result of repeated retranslocation of rCs that initially penetrated the bark into the internal tissues. To implement effective measures after a possible accident in the future, it is necessary to clarify how rCs is translocated in the tree after penetration. In this study, rCs translocation was dynamically visualized using a positron-emitting tracer imaging system (PETIS) and autoradiography after the bark of apple branches was removed. The PETIS results showed the translocation of 127Cs from the branch to young shoots and the main stem in apple trees under controlled spring growing conditions. The transport velocity of rCs in the branch was faster than that in the main stem. The transport of rCs, which was either acropetal or basipetal, in the main stem through the branch junction favored basipetal movement. Autoradiography of transverse sections of the main stem indicated that basipetal translocation was due to transport in the phloem. This study demonstrated the initial translocation responses of rCs similar to previous field research, which indicates that rCs transport to the young shoots tends to be higher under controlled conditions. Our laboratory-based experimental system may be useful to gain an improved understanding of rCs dynamics in deciduous trees.
Collapse
Affiliation(s)
- Yusaku Noda
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Gunma, 370-1292, Japan
| | - Toshihiro Yoshihara
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Gunma, 370-1292, Japan; Faculty of Bioscience and Applied Chemistry, Hosei University, Tokyo, 184-8584, Japan
| | - Nobuo Suzui
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Gunma, 370-1292, Japan.
| | - Yong-Gen Yin
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Gunma, 370-1292, Japan
| | - Yuta Miyoshi
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Gunma, 370-1292, Japan
| | - Kazuyuki Enomoto
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Gunma, 370-1292, Japan
| | - Naoki Kawachi
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Gunma, 370-1292, Japan
| |
Collapse
|
2
|
Gristwood K, Luli S, Rankin KS, Knight JC. In situ excitation of BODIPY fluorophores by 89Zr-generated Cerenkov luminescence. Chem Commun (Camb) 2022; 58:11689-11692. [PMID: 36173358 DOI: 10.1039/d2cc03875g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Secondary Cerenkov-induced fluorescence imaging (SCIFI) is an emerging optical imaging technology that affords high signal-to-noise images by utilising radionuclide-generated Cerenkov luminescence to excite fluorescent probes. BODIPY dyes offer attractive properties for SCIFI, including high quantum yields and photochemical stability, yet their utility in this application in combination with clinically relevant β+-emitting radioisotopes remains largely unexplored. In this report, the fluorescence properties of three meso-substituted BODIPY analogues have been assessed in combination with the positron emitter zirconium-89. Most notably, SCIFI data acquired over 7 days shows the BODIPY scaffold remain largely inert to radiolysis, indicating the promising utility of this fluorophore class in SCIFI applications.
Collapse
Affiliation(s)
- Katie Gristwood
- School of Natural and Environmental Sciences, Faculty of Science, Agriculture and Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
| | - Saimir Luli
- Institute of Cellular Medicine, Faculty of Medical Sciences, Newcastle, Newcastle Upon Tyne, NE2 4HH, UK.
| | - Kenneth S Rankin
- Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne, NE2 4HH, UK.
| | - James C Knight
- School of Natural and Environmental Sciences, Faculty of Science, Agriculture and Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
| |
Collapse
|
3
|
Non-invasive imaging of radiocesium dynamics in a living animal using a positron-emitting 127Cs tracer. Sci Rep 2020; 10:16155. [PMID: 33060609 PMCID: PMC7567787 DOI: 10.1038/s41598-020-73351-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 09/03/2020] [Indexed: 11/08/2022] Open
Abstract
Visualizing the dynamics of cesium (Cs) is desirable to understand the impact of radiocesium when accidentally ingested or inhaled by humans. However, visualization of radiocesium in vivo is currently limited to plants. Herein, we describe a method for the production and purification of 127Cs and its use in visualizing Cs dynamics in a living animal. The positron-emitting nuclide 127Cs was produced using the 127I (α, 4n) 127Cs reaction, which was induced by irradiation of sodium iodide with a 4He2+ beam from a cyclotron. We excluded sodium ions by using a material that specifically adsorbs Cs as a purification column and successfully eluted 127Cs by flowing a solution of ammonium sulfate into the column. We injected the purified 127Cs tracer solution into living rats and the dynamics of Cs were visualized using positron emission tomography; the distributional images showed the same tendency as the results of previous studies using disruptive methods. Thus, this method is useful for the non-invasive investigation of radiocesium in a living animal.
Collapse
|
4
|
Recent Advances in Radioisotope Imaging Technology for Plant Science Research in Japan. QUANTUM BEAM SCIENCE 2019. [DOI: 10.3390/qubs3030018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Soil provides most of the essential elements required for the growth of plants. These elements are absorbed by the roots and then transported to the leaves via the xylem. Photoassimilates and other nutrients are translocated from the leaves to the maturing organs via the phloem. Non-essential elements are also transported via the same route. Therefore, an accurate understanding of the movement of these elements across the plant body is of paramount importance in plant science research. Radioisotope imaging is often utilized to understand element kinetics in the plant body. Live plant imaging is one of the recent advancements in this field. In this article, we recapitulate the developments in radioisotope imaging technology for plant science research in Japanese research groups. This collation provides useful insights into the application of radioisotope imaging technology in wide domains including plant science.
Collapse
|
5
|
Yamamoto S, Nakanishi K, Furukawa T, Tomita H. Possibility analysis of bremsstrahlung x-ray imaging of C-14 radionuclide using a LaGPS radiation imaging system. Biomed Phys Eng Express 2019. [DOI: 10.1088/2057-1976/ab12bd] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|