RADIOISOTOPES

A Thin 4πβ-Counter Operating by Negative High Voltage for the 4πβ-γ Coincidence Measurement

-Operating Characteristics-

Hiroshi MIYAHARA, Masakazu SUZUKI, Tamaki WATANABE

1978Volume 27Issue 11 Pages 625-630
Published: November 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_625

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A thin 4πβ-counter with five anode wires was operated by supplying negative high voltage to the inner wall and showed good plateau characteristics in the case of using only the center anode to take out signals in the previous experiments. This counter, as the 4πβ-counter and both 2πβ-counters, showed good plateau characteristics in these detailed experiments and no dependency on the disintegration rates examined up to 6000 dps. Then a 4πβ-γ coincidence equipment was set up using this 4πβ-counter and one NaI (Tl) scintillation detector with size of 76 mmφ×76 mm. The radioactivities that were measured for β-γ and electron capture-γ decay nuclides by this coincidence equipment were coincided with those measured by the other one. The improvement of the γ-ray detection efficiency to aim was achieved by that the efficiency obtained by this system was the same as one by the other system having two NaI (Tl) detectors with the same size.

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Production of ⁶⁷Ga, ⁶⁸Ga by Bombardment of Natural Zinc Target with α and ³He Particles

Yuichiro NAGAME, Mieko UNNO, Hiromichi NAKAHARA, Yukio MURAKAMI

1978Volume 27Issue 11 Pages 631-635
Published: November 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_631

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In order to determine the optimum irradiaton condition for the production of ⁶⁷Ga and ⁶⁸Ga, used in nuclear medicine, excitation function and thick-target yield curves were obtained for alpha and helium-3 reactions of natural zinc. With the initial alpha energy of 25 MeV, the thick-target yield of ⁶⁷Ga was found to be 165 μCi/pA⋅hr at the end of bombardment and the ⁶⁶Ga contamination could be reduced to less than 1% after about 3 days of cooling. ⁶⁸Ga could be obtained by milking from ⁶⁸Ge. With the alpha energy range of 17-40 MeV, the thick-target yield of ⁶⁸Ga was 1.2 μCi/μA⋅hr at the end of bombardment.

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Production of ⁶¹Cu, ⁶²Zn by Alpha and ³He Particle Bombardment of Natural Nickel

Hisakazu MURAMATSU, Etsuko SHIRAI, Hiromichi NAKAHARA, Yukio MURAKAMI

1978Volume 27Issue 11 Pages 636-641
Published: November 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_636

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The optimum irradiation conditions were investigated for the production of ⁶¹Cu and ⁶²Zn by alpha and ³He particle bombardment of natural nickel. Formation cross sections and thick-target yields were obtained for reaction products in the energy range of 10 to 40 MeV. For the production of ⁶¹Cu and ⁶²Zn, the alpha particle bombardment was found superior to the ³He particle bombardment in so far as the yield was concerned.
When the incident alpha energy of 21 Me V was chosen, after 2.4 hours of cooling, 2.1 mCi/μA⋅h of ⁶¹Cu could be produced with less than 1 % of ⁶⁰Cu contamination. For the production of ⁶²Zn, when the incident alpha energy of 35 MeV and the target thickness of 57 mg /cm² were chosen, 97, 5 μCi/μA⋅h of ⁶²Zn could be produced. Radiochemical purity of ⁶²Zn was the highest at 12 hours after the end of bombardment.

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Studies in Neutron Mutagenesis in Maize

-Effects of Dose Fractionation and Cell Moisture Status on Mutation Induction-

Taro FUJII

1978Volume 27Issue 11 Pages 642-647
Published: November 15, 1978
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_642

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Pollen grains of Bz strain of maize were exposed to 14 MeV neutrons with single or fractioared treatments, and pollinated on the recessive stock. Mutation frequency from Bz to bz was observed after harvest of F₁ seeds. No clear difference in the mutation frequencies between single and fractionation series was observed. To investigate the effects of water content upon mutation frequency of neutron and gamma-rays, seeds heterozygous for the Yg₂-gene were used. Moisture-stabilized (13%) seeds and seeds steeped in water for 24 hrs were exposed to neutrons or to gamma-rays, and mutation from Yg₂ to yg₂ was detected as color change green to yellow-green in the seedlings. In the gamma-ray treatments, the mutation frequency of wet seeds was about 1.5 times higher than that of corresponding lot of dry seeds. In the neutron treatment, on the other hand, no clear difference in frequency between wet and dry seeds was observed. It may be concluded that no change or no recovery in neutron-induced mutation was observed not only in the fractionation treatment but also in the dryy and wet seeds treatments.

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The Upper Gastrointestinal Imaging and the Gastrogram Using ^99mTc-Pertechnetate

Fumio SHISHIDO, Shinichi OKUYAMA, Hitoshi MISHINA, Tadashi TAIMA, Tach ...

1978Volume 27Issue 11 Pages 648-651
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_648

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^99mTC-Pertechnetate was used for the diagnoses of the upper gastrointestinal tract. Oral administration was useful for the detection of the stenosis and obstruction on the esophagus and the pylorus to the poor risk patients. Mucosal imaging of the stomach was clearly revealed by intravenous administration, and the scintigram of the patient with stomach cancer showed a cold region. Taking the gastric scintiphoto, temporal radioactivity in the stomach region was recorded (gastrogram) . This seems to be a new and prospective approach to the clinical gastroenterology.

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Monitoring of 14MeV Neutron Fluence by α Particle Counting

Minoru CHIBA

1978Volume 27Issue 11 Pages 652-655
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_652

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Relationship between Serum Iron (SI), Plasma Iron Disappearance rate (PID) and Plasma Iron Turnover (PIT) in Various Hematologic Diseases

Hiroshi SAITO

1978Volume 27Issue 11 Pages 656-658
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_656

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Removal of Radioactive Iodine from Waste by Using Ion Exchange Resin Column

Atsushi SUGII, Naotake OGAWA, Hiroshi OGAWA

1978Volume 27Issue 11 Pages 659-661
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_659

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Monitoring of Contaminated Materials in Patients with ¹³¹I Treatment

Takeo ORITO, Hisashi MAEKOSHI, Kunihide NISHIZAWA, Ken OHARA, Motoo OS ...

1978Volume 27Issue 11 Pages 662-665
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_662

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Substances Stimulating Recovery for Radiation Injury

Atsuhiko TAKEDA, Morio YONEZAWA, Norio KATOH

1978Volume 27Issue 11 Pages 666-675
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_666

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Property of Domestic Thermoluminescent Dosimeter

Toshiyuki NAKAJIMA

1978Volume 27Issue 11 Pages 676-686
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_676

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Measurements of Radioactive Substance and Surface Dose Rate in Some Wares for Health Improvement

Haruo CHISAKA, Yukio INOKOSHI

1978Volume 27Issue 11 Pages 687-689
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_687

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Practical Techniques of Activation Analysis to Agricultural and Biological Samples (VI)

(5) Activation Analysis of Metal Trace Elements in River Water

Sumiko NAGATSUKA

1978Volume 27Issue 11 Pages 690-697
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_690

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[title in Japanese]

1978Volume 27Issue 11 Pages A1867-A1366
Published: November 15, 1978
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.27.11_A1867

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