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Volume 33, Issue 7
Displaying 1-16 of 16 articles from this issue
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Shoji TOMINAGA1984Volume 33Issue 7 Pages 423-430
Published: July 15, 1984
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA new computational method is described for estimating the exposure-rate spectral distributions of X-rays from attenuation data measured with various filtrations. The estimation problem of X-ray spectra is formulated as the numerical computation of solving a set of linear equation with an ill-conditional nature. In this paper, the singular-value decomposition technique, which differs from the iterative method, is applied to this singular numerical computation problem. The principle of the analysis method is based on that the response matrix of filtra-tions can be decomposed into some inherent component matrices. X-ray spectral distributions are then represented in a simple combination of some component curves, so that the estimation process can be systematically constructed. The singularity in its computation is removed by selecting the components of the combination, and a performance index is also presented for the optimal selection. The feasibility of the proposed method is studied in detail in a computer simulation using a hypothetical X-ray spectrum produced by assuming experimental conditions. The application results are also shown about the spectral distribution from a 140 kV constant voltage X-ray source.View full abstractDownload PDF (856K) -
Yoshikazu INOUE, Tetsuo IWAKURA1984Volume 33Issue 7 Pages 431-436
Published: July 15, 1984
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSBackground counting rate in tritium channel of a large volume liquid scintillation counter increased with water content ranged 0 to 50% of liquid scintillator. This phenomenon can be explained as follows: The height of scintillation pulses of Compton electrons induced by background gamma radiation is lowered by chemical quenching and shifts to tritium channel.
The background counting rate in tritium channel showed a linear relationship with external standard channel ratio of background samples. This relationship is applicable to determine the correct background counting rate for quenching samples and to achieve higher precision of tritium measurement.View full abstractDownload PDF (723K) -
Yatsuka MATSUDA, Norio ITO, Hiromitsu NAKABUSHI1984Volume 33Issue 7 Pages 437-443
Published: July 15, 1984
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSBy forward alpha scattering technique (FAST) light elements, from hydrogen through fluorine, are shown to be determined nondestructively and simultaneously, though these elements cannot be measured satisfactorily by any other physical method. We have studied on the app-lication of this method to atmospheric aerosol, photochemical aerosol, etc. It was assured that the whole mole ratio of aerosol can be determined by the cooperative application of the FAST and the conventional fluorescent X ray analysis. FAST has been realized to give the water content of aerosol, although the sample should be analyzed in vacuum.View full abstractDownload PDF (668K) -
Kunio OOHASHI, Naotake MORIKAWA1984Volume 33Issue 7 Pages 444-448
Published: July 15, 1984
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe recoil tritium reactions were studied with lithium p-phenylpropionate having both the aromatic and aliphatic C-H bonds in the molecule, mainly in terms of the moderator effect on the intramolecular tritium distribution. Recoil tritium atoms were produced by the 6Li (n, α) 3H reaction. Water molecules were used as the moderator. The tritium activity of the ethylene group represented relative to that of the corresponding ring assumed as a standard (=100) is 30 in the moderator-free system and is reduced to 13 in the moderated system in which the H2O/β-PhC2H4CO2Li mole ratio is 328. In the ring, the tritium distribution shows a slight ortho- and para-orientation in the moderator free system and the selectivity is pronounced when the H2O/β-PhC2H4CO2Li mole ratio is large. The data show that the aromatic ring tritiation in the moderated system is given by increasing contribution of the reactions of tritium atoms having lower energy than the threshold energy of the ethylene group tritiation.View full abstractDownload PDF (507K) -
—Distribution and behaviour of 95Zr, 95Nb originated from fallout—Aiji YAMATO, Naoto MIYAGAWA, Naotake MIYANAGA1984Volume 33Issue 7 Pages 449-455
Published: July 15, 1984
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSTo investigate behaviour of 95Zr, 95Nb in the marine environment, various samples have been collected and measured by means of Ge (Li) γ-ray spectrometry and/or radiochemical analysis during a period from 1974 to 1982 at coastal area of Tokai-mura, Ibaraki prefecture. Concentration of the nuclides in seaweeds increased remarkably after atmospheric nuclear detonation by P.R. of China, and the activity ratio between the nuclides changed by time was not fit well by the transient decay equation. Concentration variation in sea water was smaller than that in sea weeds, and the minimum change in sea sediment. Increase of concentration in these environmental samples was observed in chronological order of sea water, sea weeds then sediment after detonations, suggesting that the uptake of the nuclides by these sea weeds from sea water is faster than that via root. Observed concentration factors on the nuclides by sea weeds were calculated from the observed concentrations in sea water and sea weeds. Maximum values on 95Zr and 95Nb were 2110, 2150, respectively for Ecklonia cava and Eisenia bicyclis.View full abstractDownload PDF (761K) -
Koichi YOSHINAGA, Hideyuki TAMI, Kunihiko HASEGAWA1984Volume 33Issue 7 Pages 456-458
Published: July 15, 1984
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSIn an attempt to shed light on the influence of tritiated water for DNA we have investi-gated the damage with a simple Plasmid DNA, pBR 322. The survival of covalently closed circular (CCC DNA) form was directly followed by agrose gel electrophoresis. It was found that the survival percentage of DNA in tritiated water was observed almost the same as the irradiation of X-rays at the same absorbed doses. For the irradiation of γ-rays, on the other hand, the decay rate was larger than those of both tritiated water and X-rays. The yields percentage of the broken pieces of DNA in tritiated water, X-rays and γ-rays were found to be 43, 38 and 33% at 104 rad of the absorbed dose. It may be considered that the degree of danger in tritiated water is quite larger than that of γ-rays. It was also found that the dose rate effect was not observed in the case of tritiated water, X-rays and 7-rays irradiation.View full abstractDownload PDF (2145K) -
Hideo TAGUCHI, Akira NAKAJIMA, Kohji HAGIWARA, Norimichi KONNO1984Volume 33Issue 7 Pages 459-462
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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—Competitive study with 111In-DT-PA and 123I-OIH—Minoru HONDA, Masahiro TOMONOBU, Keisuke KANAO, Toshihiko MIYAUCHI, Ke ...1984Volume 33Issue 7 Pages 463-466
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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Isao KANAMORI, Toshitake YABASHI, Mikiko YANASE, Sadao MATSUO, Akiko K ...1984Volume 33Issue 7 Pages 467-470
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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Kimio NAKAJIMA, Michiko HOSHINO1984Volume 33Issue 7 Pages 471-473
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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Hidematsu HIRAI1984Volume 33Issue 7 Pages 474-483
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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Subcommittee for Radioisotope in vitro Test1984Volume 33Issue 7 Pages 484-494
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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Radioimmunoassay Research Society of Japan1984Volume 33Issue 7 Pages 495-501
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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Yoshihiko SUGISAWA1984Volume 33Issue 7 Pages 502-509
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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Masaharu KOJIMA1984Volume 33Issue 7 Pages 510-512
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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1984Volume 33Issue 7 Pages A49P-A74M
Published: July 15, 1984
Released on J-STAGE: July 21, 2010
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