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Journal Articles

Conceptual study on parasitic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beams in the parasitic gas cell

Sonoda, Tetsu*; Katayama, Ichiro*; Wada, Michiharu*; Iimura, Hideki; Sonnenschein, V.*; Iimura, Shun*; Takamine, Aiko*; Rosenbusch, M.*; Kojima, Takao*; Ahn, D. S.*; et al.

Progress of Theoretical and Experimental Physics (Internet), 2019(11), p.113D02_1 - 113D02_12, 2019/11

 Times Cited Count:0 Percentile:100(Physics, Multidisciplinary)

An in-flight separator, BigRIPS, at RIBF in RIKEN provides each experiment with specific nuclides separated from many nuclides produced by projectile fragmentation or in-flight fission. In this process, nuclides other than separated ones are discarded on the slits in BigRIPS, although they include many nuclides interested from the view point of nuclear structure. In order to extract these nuclides for parasitic experiments, we are developing a method using laser ion-source (PALIS). A test experiment with $$^{78}$$Se beam from RIBF has been performed by using a gas cell set in BigRIPS. Unstable nuclides around $$^{67}$$Se were stopped in the gas cell in accordance with a calculation using LISE code. The stopping efficiency has been estimated to be about 30%. As a next step, we will establish the technique for extracting reaction products from the gas cell.

Journal Articles

Electron-tracking Compton camera imaging of technetium-95m

Hatsukawa, Yuichi*; Hayakawa, Takehito*; Tsukada, Kazuaki; Hashimoto, Kazuyuki*; Sato, Tetsuya; Asai, Masato; Toyoshima, Atsushi; Tanimori, Toru*; Sonoda, Shinya*; Kabuki, Shigeto*; et al.

PLOS ONE (Internet), 13(12), p.e0208909_1 - e0208909_12, 2018/12

 Times Cited Count:0 Percentile:100(Multidisciplinary Sciences)

Imaging of $$^{95m}$$Tc radioisotope was conducted using an electron tracking-Compton camera (ETCC). $$^{95m}$$Tc emits 204, 582, and 835 keV $$gamma$$ rays, and was produced in the $$^{95}$$Mo(p,n)$$^{95m}$$Tc reaction with a $$^{95}$$Mo-enriched target. The recycling of the $$^{95}$$Mo-enriched molybdenum trioxide was investigated, and the recycled yield of $$^{95}$$Mo was achieved to be 70% - 90%. The images were obtained with each of the three $$gamma$$ rays. Results showed that the spatial resolution increases with increasing $$gamma$$-ray energy, and suggested that the ETCC with high-energy $$gamma$$-ray emitters such as $$^{95m}$$Tc is useful for the medical imaging of deep tissue and organs in the human body.

Journal Articles

The Laser and optical system for the RIBF-PALIS experiment

Sonoda, Tetsu*; Iimura, Hideki; Reponen, M.*; Wada, Michiharu*; Katayama, Ichiro*; Sonnenschein, V.*; Takamatsu, Takahide*; Tomita, Hideki*; Kojima, Takao*

Nuclear Instruments and Methods in Physics Research A, 877, p.118 - 123, 2018/01

 Times Cited Count:3 Percentile:40.19(Instruments & Instrumentation)

In order to produce low-energy RI beams at RIKEN RIBF, a laser ion source, PALIS, is under construction. This ion source is based on resonance ionization of RI atoms captured in Ar gas. Because the ion source is located 70m away from lasers, we have developed an optical system for laser beam transport. This system can be controlled remotely when the ion source is not accessible because of high radiation level. The position of laser beam after transport is reasonably stable, and the transport efficiency is about 50%.

Journal Articles

Production of $$^{rm 95m}$$Tc for Compton camera imaging

Hatsukawa, Yuichi; Hashimoto, Kazuyuki; Tsukada, Kazuaki; Sato, Tetsuya; Asai, Masato; Toyoshima, Atsushi; Nagai, Yasuki; Tanimori, Toru*; Sonoda, Shinya*; Kabuki, Shigeto*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 303(2), p.1283 - 1285, 2015/02

 Times Cited Count:2 Percentile:74.39(Chemistry, Analytical)

Technetium-99m ($$^{rm 99m}$$Tc) is used in radioactive medical diagonostic tests, for example as a radioactive tracer that medical equipment can detect in the human body. It is well suited to the role because it emits readily detectable 141 keV $$gamma$$ rays, and its half-life is 6.01 hours (meaning that about 94% of it decays to technetium-99 in 24 hours). There are at least 31 commonly used radiopharmaceuticals based on technetium-99m for imaging and functional studies of the brain, myocardium, thyroid, lungs, liver, gallbladder, kidneys, skeleton, blood, and tumors. Recent years, with the develop-ment of the Compton camera which can realize high position resolution, technetium isotopes emitting high energy $$gamma$$-rays are required. In this study, technetium-95m which emits some $$gamma$$ rays around 800 keV was produced by the $$^{95}$$Mo(p,n)$$^{rm 95m}$$Tc reaction.

Journal Articles

A Multi-reflection time-of-flight mass spectrograph for short-lived and super-heavy nuclei

Schury, P. H.*; Wada, Michiharu*; Ito, Yuta*; Naimi, S.*; Sonoda, Tetsu*; Mita, Koki*; Takamine, Aiko*; Okada, Kunihiro*; Wollnik, H.*; Chon, S.*; et al.

Nuclear Instruments and Methods in Physics Research B, 317(Part B), p.537 - 543, 2013/12

 Times Cited Count:24 Percentile:8.04(Instruments & Instrumentation)

A multi-reflection time-of-flight (MRTOF) mass spectrograph has been implemented at RIKEN to provide high-precision mass measurements of very short-lived nuclei. Of particular interest are mass measurements of r-process nuclei and trans-uranium nuclei. In such nuclei, the MRTOF can perform on par with or better than traditional Penning trap systems. We demonstrate that the MRTOF-MS is capable of accurately attaining relative mass precision of $$delta$$m/m $$<$$ 10$$^{-7}$$ and describe it's utility with heavy, short-lived nuclei.

Journal Articles

Generation of radioisotopes with accelerator neutrons by deuterons

Nagai, Yasuki; Hashimoto, Kazuyuki; Hatsukawa, Yuichi; Saeki, Hideya; Motoishi, Shoji; Sonoda, Nozomi; Kawabata, Masako; Harada, Hideo; Kin, Tadahiro*; Tsukada, Kazuaki; et al.

Journal of the Physical Society of Japan, 82(6), p.064201_1 - 064201_7, 2013/06

 Times Cited Count:32 Percentile:14.72(Physics, Multidisciplinary)

Journal Articles

Development of a resonant laser ionization gas cell for high-energy, short-lived nuclei

Sonoda, Tetsu*; Wada, Michiharu*; Tomita, Hideo*; Sakamoto, Chika*; Takatsuka, Takaaki*; Furukawa, Takeshi*; Iimura, Hideki; Ito, Yuta*; Kubo, Toshiyuki*; Matsuo, Yukari*; et al.

Nuclear Instruments and Methods in Physics Research B, 295, p.1 - 10, 2013/01

 Times Cited Count:19 Percentile:11.4(Instruments & Instrumentation)

no abstracts in English

Oral presentation

Development of trace analysis of $$^{rm 93m}$$Nb by resonance ionization mass spectrometry in gas jet toward neutron dosimetry, 1; Resonance ionization mass spectroscopy on Nb by Ti:Sapphire laser

Sakamoto, Chika*; Takatsuka, Takaaki*; Sonnenchein, V.*; Tomita, Hideki*; Sonoda, Tetsu*; Mita, Koki*; Noto, Takuma*; Adachi, Yoshitaka*; Ito, Chikara; Maeda, Shigetaka; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of a gas-jet coupled surface ion source of ISOL for measurement of the first ionization potential of Lr, 2

Kaneya, Yusuke*; Sato, Tetsuya; Sonoda, Nozomi; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Oe, Kazuhiro; Miyashita, Sunao; Nagame, Yuichiro; Sch$"a$del, M.; et al.

no journal, , 

In order to determine the first ionization energy of lawrencium (Lr, ${it Z}$ = 103), we have developed a new surface ionization ion source coupled to a gas-jet transport system in ISOL (Isotopes Separator On-Line) at the JAEA tandem accelerator facility. On-line experiments with short-lived lanthanide isotopes using the new ion-source were performed. It would be confirmed that the ionization energy of lanthanide which boiling point is up to 3000$$^{circ}$$C can be determined.

Oral presentation

Development of a surface-ionization type ion-source at the JAEA-ISOL set-up for a measurement of the first ionization potential of Lr (Z=103)

Sato, Tetsuya; Sonoda, Nozomi; Kaneya, Yusuke*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Oe, Kazuhiro; Miyashita, Sunao; Osa, Akihiko; Ichikawa, Shinichi; et al.

no journal, , 

In order to determine the first ionization potential of lawrencium (Lr, Z=103), we have developed an appropriate surface-ionization type ion source as a part of the JAEA-ISOL setup, which is coupled to a He/CdI$$_2$$ gas-jet transport system. The new ion source is an improved version based on our previously used ion source, which already had a good ionization efficiencies for lanthanide. To achieve higher ionization efficiencies of low volatility elements like Lr, an additional filament was newly installed. We report, here, on the development and performance of our new gas-jet coupled surface-ionization ion source, and on the first successful ionization and mass separation of 27-s $$^{256}$$Lr produced in the $$^{249}$$Cf + $$^{11}$$B reaction.

Oral presentation

Measurement of the first ionization potential of Lr by surface ionization method

Sato, Tetsuya; Kaneya, Yusuke*; Sonoda, Nozomi; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Oe, Kazuhiro; Miyashita, Sunao; Nagame, Yuichiro; Sch$"a$del, M.; et al.

no journal, , 

In order to determine the first ionization potential (IP) of lawrencium (Lr, Z=103), we have developed a surface ionization type ion-source coupled to a He/CdI$$_2$$ gas-jet transport system for the JAEA-ISOL. We measured ionization efficiencies of $$^{256}$$Lr and various short-lived lanthanide isotopes by applying the ion-source. We successfully ionized and mass-separated for the first time $$^{256}$$Lr ions. From a correlation between the IPs and ionization efficiencies of the short-lived lanthanide isotopes, we estimated the IP of Lr in this work.

Oral presentation

Development of surface ionization method for determination of the first ionization potentials of heavy actinides

Kaneya, Yusuke*; Sato, Tetsuya; Sonoda, Nozomi; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Oe, Kazuhiro; Miyashita, Sunao; Nagame, Yuichiro; Sch$"a$del, M.; et al.

no journal, , 

We have developed a surface ionization ion-source as part of the JAEA-ISOL that is coupled to a He/CdI$$_{2}$$ gas-jet transport system to determine the first ionization potential (IP) of heavy actinides. Ionization efficiencies of various short-lived lanthanide isotopes produced in the nuclear reactions were measured with the present system. Obtained results demonstrate that the developed ion-source could be applicable to the measurement of the IP of heavy actinides.

Oral presentation

Application of Electron Tracking Compton Camera (ETCC) in medical imaging

Sonoda, Shinya*; Nabeya, Akira*; Kimura, Hiroyuki*; Kabuki, Shigeto*; Takada, Atsushi*; Kubo, Hidetoshi*; Komura, Shotaro*; Tanimori, Toru*; Matsuoka, Yoshihiro*; Mizumura, Yoshitaka*; et al.

no journal, , 

SPECT and PET are widely used for medical imaging. However, radio isotopes available for SPECT and PET are limited. Under these circumstances, it is expected the appearance of the new $$gamma$$ imaging detector which can measure more various kinds of $$gamma$$-ray sources in order to develop new biomarkers using new radio isotopes. We set out to contribute to medical imaging technology by developing Electron-Tracking Compton Camera (ETCC) which can measure the various radioactive medicine.

Oral presentation

Application of Electron Tracking Compton Camera (ETCC) in medical imaging

Sonoda, Shinya*; Nabetani, Akira*; Kimura, Hiroyuki*; Kabuki, Shigeto*; Takada, Atsushi*; Kubo, Hidetoshi*; Komura, Shotaro*; Sawano, Tatsuya*; Tanimori, Toru*; Matsuoka, Yoshihiro*; et al.

no journal, , 

We present the performance results using this new ETCC such as the imaging test using F-18 in point-like and rod-like phantoms with varying the intense of radiation. In addition, the measurementof Tc-95m which is produced by Japan Atomic Energy Agency was performed. Tc-95m emitsthe $$gamma$$-rays with the energy, 204, 583, and 835 keV, and then an image with multi-energies is examined. The position resolution achieves less than about 8 degrees from 10 degrees at 511 keV by this improvement. Further improvement of the angular resolution (position resolution) will be presented until 2015 spring. Also, we are developing the next ETCC by increasing the thickness of the scintillator from 1 rad. to 2 rad. and the gas pressure from 1 atm to 3 atm which improvethe detection efficiency by a factor of $$>$$ 5 at 511 keV. By these improvements, the imaging time of mouse is expected to be reduced from several hours with to $$<$$20 minutes for lots of kinds of RIs with the energy band from 0.1-2 MeV.

Oral presentation

Production of $$^{95m}$$Tc for Compton camera imaging

Hatsukawa, Yuichi; Tsukada, Kazuaki; Hashimoto, Kazuyuki; Sato, Tetsuya; Asai, Masato; Toyoshima, Atsushi; Nagai, Yasuki; Tanimori, Toru*; Sonoda, Shinya*; Kabuki, Shigeto*; et al.

no journal, , 

In recent years, the Compton camera which is originally developed for the astrophysical studies was applied for medical diagnostic usage. For the Compton camera imaging require technetium isotopes emitting higher energy $$gamma$$-rays. Two Tc isotopes, $$^{95m}$$Tc (T$$_{1/2}$$ = 60 d; E$$gamma$$ = 204, 582 and 835 keV) and $$^{96}$$Tc(T$$_{1/2}$$ = 4.28 d, E$$gamma$$ = 778 and 812 keV) are candidates for Compton camera imaging. Compton camera imaging can realize high position resolution without collimator. Because of no collimator using, the Compton camera makes higher $$gamma$$-ray detection efficiency. Compared with SPECT with $$^{99m}$$Tc, the Compton camera imaging technique can be expected that radiation exposure deduce to 1/5-1/10. In this study, technetium-95m was produced by the $$^{95}$$Mo(p,n)$$^{95m}$$Tc reaction.

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