Determination of trace amount of Tc by laser induced photoacoustic spectroscopy.

激光诱导光声光谱法测定痕量 Tc。

• 批准号: 03558022
• 负责人: SEKINE Tsutomu
• 金额: $ 9.41万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03558022/
• 关键词: technetium; laser induced photoacoustic spectroscopy; テクネチウムチオウレア錯体; テクネチウムイソチオシアナト錯体; 光音響分光法; PZT検出器; 光音響

The radioactive nuclides, ^<99>Tc, has been of great interest from the view-point of global pollution. This nuclide is one of the most important fission products, because it is produced with comparatively high fission yield (6.06%). Because of its long half life (2.14 x 10^5 y) and a character of almost pure beta-emitter, its determination or detection can not be easily performed. In this study, the application of Laser Induced Photoacoustic Spectroscopy (LPAS) method to the determination of technetium was examined for the first time. A nitrogen gas laser was used to pump up a dye laser to obtain suitable monochromatic pulsed laser beam. A detection part which involves piezo-electric transducer (PZT) as a signal detector was home-made. Hexakis(thiourea)technetium(III) ([Tc(tu)6]^<3+>) and hexakis(isothiocyanato)technetium(IV) ([Tc(NCS)6]^<2->) complexes were chosen for the LPAS measurements. These complexes can be quantitatively obtained in the appropriate solution with simple chemical treatment, and they show intense absorption peaks near 500 nm region. Fast Fourier Transform (FFT) analysis was conducted after taking averaged signals. The FFT intensity was quantitatively observed for the wide range of technetium concentration for both complexes. The detection could be performed down to 10^<-8> M for [Tc(tu)6]^<3+> and to 10^<-9> M for [Tc(NCS)6]^<2->, respectively, showing 100 - 1000 times more sensitive than the ordinary colorimetric measurement.

从全球污染的角度来看，放射性核素^<99>Tc引起了人们极大的兴趣。这种核素是最重要的裂变产物之一，因为它的裂变产率较高（6.06%）。由于其半衰期长（2.14 x 10^5 y）和几乎纯β发射体的特性，其测定或检测并不容易。本研究首次应用激光诱导光声光谱（LPAS）方法测定锝。使用氮气激光器泵浦染料激光器以获得合适的单色脉冲激光束。检测部分采用压电换能器（PZT）作为信号检测器，是自制的。选择六(硫脲)锝(III) ([Tc(tu)6]^<3+>) 和六(异硫氰酸)锝(IV) ([Tc(NCS)6]^<2->) 配合物用于LPAS 测量。这些配合物可以通过简单的化学处理在适当的溶液中定量获得，并且它们在500 nm附近显示出强烈的吸收峰。取平均信号后进行快速傅立叶变换 (FFT) 分析。对两种配合物的各种锝浓度定量观察 FFT 强度。 [Tc(tu)6]^<3+> 的检测可低至 10^<-8> M，[Tc(NCS)6]^<2-> 的检测可低至 10^<-9> M，其灵敏度比普通比色测量高 100 - 1000 倍。

项目成果

T.Sekine: "Application of Laser Induced Photoacoustic Spectroscopy to the Determination of Tc-99." J.Nucl.Sci.Technol.30. 1131-1135 (1993)

T.Sekine：“激光诱导光声光谱法在 Tc-99 测定中的应用”。

A.Mutalib: "Synthesis and Characterization of Bis(beta-diketonato)-nitridotechnetium(V) Complexes." Radiochim.Acta. 63. 123-128 (1993)

A.Mutalib：“双（β-二酮）-硝基锝（V）复合物的合成和表征。”

T.Fujita: "Determination of Technetium by Laser Induced Photoacoustic Spectroscopy Coupled with a Wave-Length Shifter Method" Radiochim.Acta. 63. 45-47 (1993)

T.Fujita：“通过激光诱导光声光谱与波长移位器方法结合测定锝”Radiochim.Acta。

A.Mutalib: "Synthesis and Characterization of Bis(β-diketonato)-nitrido technetium(V)" Radiochim.Acta. 63. 123-128 (1993)

A.Mutalib：“双（β-二酮）-硝基锝（V）的合成和表征”Radiochim. Acta 63. 123-128（1993）

T.Sekine: "Application of Laser Induced Photoacoustic Spectroscopy to the Determination of ^<99>Tc" J.Nucl.Sci.Technol.30. 1131-1135 (1993)

T.Sekine：“激光诱导光声光谱测定^<99>Tc 的应用”J.Nucl.Sci.Technol.30。