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Journal Articles

Reduction of Compton background from hydrogen in prompt $$gamma$$-ray analysis by multiple photon detection

Toh, Yosuke; Oshima, Masumi; Kimura, Atsushi; Koizumi, Mitsuo; Furutaka, Kazuyoshi; Hatsukawa, Yuichi; Goto, Jun*

Journal of Radioanalytical and Nuclear Chemistry, 278(3), p.685 - 689, 2008/12

https://doi.org/10.1007/s10967-008-1505-x
 Times Cited Count：5 Percentile：35.07(Chemistry, Analytical)

no abstracts in English

Journal Articles

Development of a neutron beam line and detector system for multiple prompt $$gamma$$-ray analysis

Toh, Yosuke; Oshima, Masumi; Furutaka, Kazuyoshi; Kimura, Atsushi; Koizumi, Mitsuo; Hatsukawa, Yuichi; Goto, Jun*

Journal of Radioanalytical and Nuclear Chemistry, 278(3), p.703 - 706, 2008/12

https://doi.org/10.1007/s10967-008-1508-7
 Times Cited Count：14 Percentile：66.71(Chemistry, Analytical)

no abstracts in English

Journal Articles

Neutron activation analysis of trace elements in Japanese hormesis cosmetics

Furuta, Etsuko*; Nakahara, Hiromichi*; Hatsukawa, Yuichi; Matsue, Hideaki; Sakane, Hitoshi*

Journal of Radioanalytical and Nuclear Chemistry, 278(3), p.553 - 557, 2008/12

https://doi.org/10.1007/s10967-008-1004-0
 Times Cited Count：6 Percentile：40.09(Chemistry, Analytical)

In Japan, cosmetics which declared hormesis effect are available through Internet. The existence of a daughter nuclides of Th and U series, however, were observed by measurements of the $$gamma$$ rays with a high purity Ge detector. In this study, in order to clarify the contents of trace elements, the hormesis cosmetics including radiation sources were analyzed using instrumental neutron activation analysis method (INAA), prompt $$gamma$$ activation analysis (PGAA) and neutron activation analysis with multiple $$gamma$$ ray detection (NAAMG). In the conference, we will report the results of analysis data which including heavy metallic and actinide elements. Furthermore, we will evaluate a possibility of uptake of heavy metal elements and radiation sources, and will discuss the influence of them to human body.

Journal Articles

Lower limit of determination values for trace elements in iron certified reference materials by neutron activation analysis with multiple $$gamma$$-ray detection

Kimura, Atsushi; Toh, Yosuke; Oshima, Masumi; Hatsukawa, Yuichi

Journal of Radioanalytical and Nuclear Chemistry, 278(2), p.521 - 525, 2008/11

https://doi.org/10.1007/s10967-008-0917-y
 Times Cited Count：3 Percentile：23.55(Chemistry, Analytical)

The authors reported the lower limit of determination values (LDL) for As and Sb in high purity iron and the accuracy of neutron activation analysis with multiple $$gamma$$-ray detection method. The values of the LDLs for As and Sb in high purity iron were 0.002 and 0.0009 ppm. As the demanded LDL for both As and Sb is 0.1 ppm, and the values attained by this method substantially satisfy the requirement. The dispersion of this method is enough small to satisfy the demand from material science.

Journal Articles

Multiple $$gamma$$-ray detection method and its application to nuclear chemistry

Oshima, Masumi; Toh, Yosuke; Hatsukawa, Yuichi; Koizumi, Mitsuo; Kimura, Atsushi; Haraga, Tomoko; Ebihara, Mitsuru*; Sushida, Kazuyoshi*

Journal of Radioanalytical and Nuclear Chemistry, 278(2), p.257 - 262, 2008/11

https://doi.org/10.1007/s10967-008-0303-9
 Times Cited Count：24 Percentile：81.47(Chemistry, Analytical)

It is well known that most radioactive nuclides emit coincident multiple $$gamma$$-rays. The multiple $$gamma$$-ray detection method takes advantage of this feature and the $$gamma$$-rays are detected in coincidence with a $$gamma$$-ray detector array. From the correlated data we can create a $$gamma$$-$$gamma$$ two-dimensional matrix or $$gamma$$-$$gamma$$-$$gamma$$ three-dimensional cube. On this matrix or cube an energy resolution much better than the ordinary one-dimensional spectrum can be achieved. Furthermore signal-to-noise ratio is considerably improved. Hence this method can be applied widely to radioactive nuclide analysis. In the talk I will present its typical application to the analysis of nuclear waste, neutron activation analysis (NAAMG), and prompt $$gamma$$-ray analysis (MPGA).

Oral presentation

Separation of uranium, thorium, lead and lanthanoids in environmental samples with a single anion-exchange column

Miyamoto, Yutaka; Kokubu, Yoko; Magara, Masaaki; Sakurai, Satoshi; Usuda, Shigekazu

no journal, , 

To investigate separation scheme of trace amounts of U, Th, Pb and lanthanoids using anion-exchange method to analyse the abundance and isotopic ratio of those elements in environmental samples, appropriate combination of eluants was examined for separating the elements in a working standard for mass calibration of ICP-MS using a single anion-exchange column in CLEAR at JAEA. Concentration of the elements in fractions of the eluates was measured with an ICP-MS and also by INAA. It was found that acetate form of anion-exchanger was suitable for adsorption of the elements on the column. By using acetic acid, mixed media of methanol - hydrochloric acid and hydrochloric acid as the eluants, lanthanoids, Pb, Th and U were separated in sequence. Performance of separation using the scheme will be presented.

Oral presentation

2D elemental analysis approach in focused neutron beam induced prompt $$gamma$$-ray analysis at JAEA

Segawa, Mariko; Matsue, Hideaki; Sekiya, Yuji*; Yamada, Satoru*; Shinohara, Takenao; Oku, Takayuki; Suzuki, Junichi; Shimizu, Hirohiko*

no journal, , 

Since neutron has the stronger penetration power than those for charged particles, the 2 dimensional prompt $$gamma$$-ray analysis methods with use of neutron beam is the only way enables the nondestructive, isotopic and position dependent observation on small quantities of samples. Hence, we aimed at developing 2 dimensional prompt $$gamma$$-ray analysis systems in focused neutron beam at JAEA with a high resolution within a 1 mm. The neutron beam is 0.6mm FWHM focused and collimated with use of a multi-channel parabolic guide and a 6LiF collimator set at 90 cm and 1.5 cm upstream with respect to the neutron beam from sample position, respectively. The sample could be stepping drive with 0.1 mm. In this study, we succeed for increasing the position resolution within 1 mm, since we could split two neutron captured $$gamma$$-ray peaks from two minute Cd wire-sample, the diameter is 0.25 mmphi and the length is 5 mm, set at 1mm intervals.

Oral presentation

Automated rapid radiochemical separations of the heaviest elements

Nagame, Yuichiro

no journal, , 

To perform rapid and repetitive chromatographic experiments with the heaviest elements, we developed an automated rapid ion-exchange separation apparatus AIDA (Automated Ion-exchange separation apparatus coupled with the Detection system for Alpha-spectroscopy). AIDA consists of a miniaturized computer controlled high performance liquid chromatography system and an automated on-line $$alpha$$-particle detection system. It enables us to perform cyclic discontinuous column chromatographic separations of short-lived nuclides in aqueous solutions and automated detection of $$alpha$$-particles within a typical cycle of 1-2 min. Ion-exchange chromatographic study of element 104, rutherfordium $$^{261}$$Rf, T$$_{1/2}$$ = 78 s, produced via the reaction of $$^{248}$$Cm($$^{18}$$O, 5n), with a cross section of 10 nb, at the JAEA tandem accelerator is presented.

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