Evaluation of in vivo detection properties of 22Na, 65Zn, 86Rb, 109Cd and 137Cs in plant tissues using real-time radioisotope imaging system
Evaluation of in vivo detection properties of 22Na, 65Zn, 86Rb, 109Cd and 137Cs in plant tissues using real-time radioisotope imaging system
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DOI：
10.1088/0031-9155/59/4/837
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发表时间：
2014-02-21
影响因子：
3.5
通讯作者：
Nakanishi, Tomoko M.
中科院分区：
文献类型：
--
作者：
Sugita, Ryohei;Kobayashi, Natsuko I.;Nakanishi, Tomoko M.
在植物研究中，放射性同位素成像提供了有关各种组织中的生理活动和植物器官之间的元素运输的有用信息。为了扩大成像技术的使用范围，开发了一种新的系统来可视化植物体发射的β粒子，X射线和伽马射线。这种实时放射性同位素成像系统（RRIS）在用CsI（Tl）闪烁体板转换成光后使放射性可视化。在此，评价了γ射线发射体Na-22、Zn-65、Rb-86、Cd-109和Cs-137的RRIS检测特性，并与使用成像板的放射发光照相术（RLG）的RRIS检测特性进行了比较。在15分钟内，定量检测下限（Bq mm（-2））范围从0.1到4，取决于核素，类似于RLG。当分析检测来自各种拟南芥组织的辐射的定量能力时，角果和粗节间中的定量能力倾向于低。在EGS 5模拟中，β粒子是Na-22、Rb-86和Cs-137的RRIS成像的最大贡献者，而低能X射线对Zn-65和Cd-109的探测有显著贡献。因此，样品和闪烁体表面之间的自吸收和空气空间可能会损害定量RRIS成像。尽管存在这些问题，建议将RRIS用于工厂内放射性核素运动的定量时程测量。
In plant research, radioisotope imaging provides useful information about physiological activities in various tissues and elemental transport between plant organs. To expand the usage of imaging techniques, a new system was developed to visualize beta particles, x-rays and gamma-rays emitted from plant bodies. This real-time radioisotope imaging system (RRIS) visualizes radioactivity after conversion into light with a CsI(Tl) scintillator plate. Herein, the RRIS detection properties of the gamma-ray emitters Na-22, Zn-65, Rb-86, Cd-109 and Cs-137 were evaluated in comparison with those of radioluminography (RLG) using an imaging plate. The lower quantitative detection limit (Bq mm(-2)) during a 15 min period ranged from 0.1 to 4, depending on the nuclide, similar to that of RLG. When the quantitative ability to detect radiation from various Arabidopsis tissues was analyzed, the quantitative capability in silique and the thick internode tended to be low. In an EGS5 simulation, beta particles were the greatest contributors to RRIS imaging of Na-22, Rb-86 and Cs-137, and low-energy x-rays contributed significantly to Zn-65 and Cd-109 detection. Thus, both self-absorption and air space between the sample and scintillator surface could impair quantitative RRIS imaging. Despite these issues, RRIS is suggested for quantitative time-course measurements of radionuclide motion within plants.