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Hideo MURAYAMA, Norimasa NOHARA, Eiichi TANAKA
1978 Volume 27 Issue 8 Pages
433-438
Published: August 15, 1978
Released on J-STAGE: September 07, 2010
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A new method is described for the measurement of the system intrinsic variance of scintillation detectors. The system intrinsic variance can be obtained by subtracting the component of photomultiplier variance from the total (observed) variance of detector pulse amplitude; the former component has usually been determined by the use of a light pulser.In the present method, two photomultiplier tubes are optically coupled to a scintillator which is irradiated by a collimated beam of γ-rays, and the system intrinsic variance is determined from the analysis of mutual correlation of pulse amplitude between the outputs of these two photomultiplies tubes. The method does not need the use of a light pulser, and is able to discriminate the effect of multiple interaction of γ-rays in the scintillator.A preliminary experiment with a cylindrical NaI (Tl)
crystal (4cmφ×10 cm) has been performed for a range of γ-ray energy from 60 keV to 835 keV. The result is well consistent with ones reported by other authors using light pulsers.
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Hiroshi MIYAHARA, Masakazu SUZUKI, Tamaki WATANABE
1978 Volume 27 Issue 8 Pages
439-444
Published: August 15, 1978
Released on J-STAGE: September 07, 2010
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A thin 4πβ-multiwire proportional counter was constructed to increase the γ-ray counting efficiency in the 4πβ-γ coincidence method. This counter with a counting volume of 70×60×11 mm and 5 wires in one half was made of an insulator and negative high voltage was supplied to the inner wall being possessed of conductivity. Then the anodes were operated at the earth potential and compact preamplifiers with no coupling condenser were fixed at the side of each half to miniaturize a shielding system for background.From the experimental results in various conditions, good characteristics were obtained in the case that signals were taken out from the center anode and the others were used only for cleaning up excess charges.
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Kimiko EMA, Taizo KATO, Mutsuaki SHINAGAWA
1978 Volume 27 Issue 8 Pages
445-450
Published: August 15, 1978
Released on J-STAGE: September 07, 2010
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Alanine, β-alanine, glicine, as partic, α-amino-n-butyric and γ-amino-n-butyric acid were obtained by γ-irradiation of aqueous ammonia solutions of lactic, β-oxypropionic, glyeoholic, malic, α-oxybutyric andγ-oxybutyric acid, respectively. The yields of amino acids were examined as functions of radiation dose (0.75-3.55 Mrad), concentrations of oxy acid (0.01-0.1M) and ammonia (0.1-15M), and substances, which had been added as a radical scavenger, e.g., potassium iodide, and as a hydrated electron scavenger, e.g., nitrous oxide.The maximum G-values were 0.6 for alanine in the solution of 0.1M lactic acid-4M ammonia and some nitrous oxide, and 1.14 for β-alanine in the solution of 0.1M, β-oxypropionic acid and 0.7M ammonia. The yield of alanine increased with increasing concentrations of lactic acid and ammonia, and by saturation of nitrous oxide, but decreased by addition of potassium iodide (0.03M) . The yield ofβ-alanine showed a maximum at ca. 0.7M ammonia and decreased by addition of both potassium iodide and nitrous oxide. Serine was obtained with G=0.002 in the solution of β-oxypropionic acid and increased to G=0.058 by saturation of nitrous oxide.The mechanisms of radiation chemical amination were examined from above results. It could generally be explained that oxy acids of which hydrogen had been abstracted by H
or OH
radical reacts with ammonia to form amino acids. The effect of ammonia concentration on the yield of amino acids demonstrates that NH2 radical abstracts the α-hydrogen of lactic acid, but does not react with β-hydrogen of β-oxypropionic acid. The effect of nitrous oxide indicates that hydrated electron interferes with the alanine formation and contributes to the β-alanine formation. It implies that hydrated electron reacts with carboxyl group of lactic acid to form lactamide and abstracts β-hydroxyl group of β-oxy propionic acid to form β-alanine.
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Hideo SAJI, Tatsuo IDO, Ren IWATA, Kazutoshi SUZUKI, Kazuhiko TAMATE, ...
1978 Volume 27 Issue 8 Pages
451-455
Published: August 15, 1978
Released on J-STAGE: September 07, 2010
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Caffeine, ephedrine and methylephedrine were labeled with carbon-11 by the action of methyliodide-11C
on theophylline, norephedrine and ephedrine, respectively. Caffeine-11C
was prepared in 44 min with a radiochemical yield of 40%, ephedrine-11C
in 45 min with a 11% radiochemical yield and methylephedrine-11C
in 36 min with a 43% radiochemical vield.When injected in mice intravenously, these products show a high uptake in the liver, the kidney and the blood for caffeine-11C
and in the liver and the kidney for ephedrine-11C
and ethylephedrine-11C.
The brain uptake for these products was found to be 2.4 to 3.9% of the injected dose per gram at 5 min after injection. These studies in mice have demonstrated that these products are potentially useful agents for the dynamic studies of the brain.
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Yoshihiko OSHIUMI, Hiroo YAGI, Hiromu NISHITANI, Chikashi NAKAYAMA, It ...
1978 Volume 27 Issue 8 Pages
456-459
Published: August 15, 1978
Released on J-STAGE: September 07, 2010
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Urine CEA levels of sixty six cystectomy patients with urinary tract reconstruction using the small or large bowel was evaluated.Most of them had abnormally high CEA levels regardless of bladder tumor recurrence. Ileal conduit cases showed higher CEA levels than those of colocystoplasty cases. We think this is probably due to difference of mucosal surface areas rather than of original location of the resected specimens, for the small bowel contains much wider mucosal surface in a length unit.
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Tze-Yu Wu, Chia-Lian TSENG, Pao-Shan WENG
1978 Volume 27 Issue 8 Pages
460-463
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
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Kikuo MACHIDA, JUNICHI NISHIKAWA, Tohru MACHIDA
1978 Volume 27 Issue 8 Pages
464-465
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
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Fumio KINOSHITA, Koichi YATOMI, Hiyori TAKAHASHI, Katsushi NAKASHIKIRY ...
1978 Volume 27 Issue 8 Pages
466-469
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
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Fumio KINOSHITA, Akira MAEKAWA, Shiroo TORIYA, Tetsuya FUNAHASHI, Ryoj ...
1978 Volume 27 Issue 8 Pages
470-473
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
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Keisuke KANAO, Toshiro KIKKAWA, Takashi HARA, Tadashi KURIHARA, Setsuk ...
1978 Volume 27 Issue 8 Pages
474-476
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
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Tetsuo NAKAJIMA, Bunmei KADO, Mizuyoshi SAKURA, Toshio TABEI, Yasuhito ...
1978 Volume 27 Issue 8 Pages
477-480
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
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Takahiko AOYAMA, Tamaki WATANABE
1978 Volume 27 Issue 8 Pages
481-489
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
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(3) Activation Analysis of Minor Elements in Plant Materials (2)
Masao SHIBUYA
1978 Volume 27 Issue 8 Pages
490-498
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
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1978 Volume 27 Issue 8 Pages
A1843-A1348
Published: August 15, 1978
Released on J-STAGE: July 21, 2010
JOURNAL
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