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Kunio OOHASHI, Naotake MORIKAWA
1984 Volume 33 Issue 9 Pages
601-605
Published: September 15, 1984
Released on J-STAGE: September 07, 2010
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The T
for-H
substitution reaction was studied in the recoil tritium reactions with toluene in C
6F
6-
moderated systems. The moderator free control experiment showed an approximately uniform labeling in the aromatic ring, with a slightly enhanced reactivity in the ortho- and para-positions (o: 41%, m: 38%, p: 21%) and showed a preference for ring tritiation over methyl group tritiation (23 relative to the corresponding ring assumed as a standard (=100) ) . The addition of hexafluorobenzene progressively changed the uniform distribution to a marked ortho- and para-orientation and decreased the relative tritium activity of the methyl group. If the C
6F
6/PhCH
3 mole ratio is 204, the tritium distribution in the ring is o: 53%, m: 22%, p: 25% and the methyl group activity is reduced to 2. The data show the existence of the threshold energy of side chain tritiation and that the selective aromatic ring tritiation is given by increasing contribution of the reactions of tritium atoms having lower energy than the threshold energy.
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Sadami SHIBABE, Karin YODA
1984 Volume 33 Issue 9 Pages
606-610
Published: September 15, 1984
Released on J-STAGE: September 07, 2010
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Deuterium oxide affected all types of transport processes of ions in rice seedlings. The processes of the active transport of Rb
+,
the passive diffusion of Ca
2+,
and the preferential and specific absorption of Ge
by the seedlings in D
2O
solutions, were suppressively distorted by D
2O.
The suppressive effect on the translocation of all ions studied and the absorption of Rb
+,
was greater with higher concentrations of D
2O.
However, clear-cut relations of the effect of increasing D
2O
concentrations on the ion transport were not obtained. The extent of the replacement of H
2O
by D
2O
in the plant appeared to affect the movement of ions in the plant.
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Hideo SAJI, Kazuji ENOKI, Taro TOKUI, Yoshiharu YONEKURA, Yoshiaki NIS ...
1984 Volume 33 Issue 9 Pages
611-616
Published: September 15, 1984
Released on J-STAGE: September 07, 2010
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The quantitative measurement of regional blood flow and regional extravascular lung water, called for a design of 15O
labeled water production and administration under continuous and constant flow. In our search for simple methodology, suitable for clinical routine facilities, two remote-controlled systems were designed and their applicability for continuous and constant infusion of H
215O
were tested.
In the system (A) , H
215O
was prepared from C
15O
2 based on the fast exchange reaction between carbon dioxide and carbonic acid. In the system (B), the reaction of 15O
2 with H
2 using palladium as a catalyst was adopted. In the both systems, the radioactivity level of the infusate was kept constant by using a buffer reservoir. Clinical applicability of both fully automated systems for the production of sterile H
215O
at a continuous and constant rate was discussed. Namely, system (A), being very simple seems more suitable for any closely located facility but system (B) is more suited for the production of higher radioactivity.
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Toru SASAKI, Shuji KOJIMA, Akiko KUBODERA
1984 Volume 33 Issue 9 Pages
617-622
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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67Ga
uptake of the liver began to elevate from the 1st day and reached a maximum at the 2nd day after treatment with thioacetamide (TIAA) . Incorporation of 3H-
thymidine into the liver DNA fraction was reached a maximum at the 1.5th day, and the value was 5.7 times of the control. The uronic acid content and 35S
incorporation in the 1.2 M NaCl-
soluble fraction which contained predominantly heparan sulfate (HS), were both peaked at the 2nd day. These patterns were in good agreement with that of 67Ga
uptakes in the liver treated with TIAA. Pretreatment of aminoacetonitrile, an inhibitor of fibrosis, was effective in lowering the elevated uptake of 67Ga
in TIAA-treated rat liver. Uptake of the 67Ga
in the TIAA-treated liver was also inhibited when they were treated with cycloheximide, an inhibitor of protein synthesis. On the other hand no significant inhibition was observed in the cytosine arabinoside-treated-TIAA rats.
These results suggest that HS may be involve in the 67Ga
uptake in damaged liver, and that relation between 67Ga
uptake and cell proliferation is secondary.
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Kenji SAEGUSA, Noboru ARIMIZU, Sadao UEMATSU
1984 Volume 33 Issue 9 Pages
623-628
Published: September 15, 1984
Released on J-STAGE: September 07, 2010
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In the measurements of regional cerebral blood flow (rCBF) using inhalation of 133Xe
gas, the activity present is generally limited in lower levels than those of usual brain scintigraphy. Measurements with low count-rate are usually resulted in diminishing the accuracies of results obtained. Therefore, it is necessary to make measurements using a high sensitive collimator for getting as much count-rate as possible when a gamma camera is used.
The relationships among sensitivity and structures of multi-parallel collimator were mathematically analyzed. The results of analysis suggested that sensitivity usually increased by using a collimator with holes of reduced height and diameter. A prototype multi-parallel collimator with holes of low height and small diameter was made in our laboratory for testing sensitivity and resolution. The collimator possessing 1141 holes of 6 mmq.5 in hole diameter, 1.5 cm is hole height and septal thickness of 1 mm lead showed 24 times more sensitive than those of a general all purpose collimator supplied by the manufacturer. However, resolution measured in FWHM was of 9 to 14 mm at the collimator face and of 29 to 38 mm at 5 cm from the face. The results indicated that this collimator was useful enough in rCBF measurements with 133Xe
inhalation using a gamma camera. The mathematical analysis however, suggested that optimum collimator for rCBF measurements was approximate 4.5 mmφ in hole diameter and 1.0 cm in hole height.
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Yoshiyuki TANAKA
1984 Volume 33 Issue 9 Pages
629-631
Published: September 15, 1984
Released on J-STAGE: September 07, 2010
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Leakage of gaseous 125I
from the various kinds of plastic film bags packing Na
125I
solution was determined. The polyethylene bag was permeable to the gaseous 125I
and active charcoal could not prevent the leakage. The laminated plastic bags composed of polyethylene terephthalate and polyethylene was slightly permeable, and the leakage decreased either in the presence of active charcoal or with the use of doubly packed bags. Leakage of 125I
from the various kinds of container for the Na
125I
solution was also determined.
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—Identification of natural nuclide present in underground (well) water samples—
Naoyuki MURAKAMI, Tetsuya KONISHI, Hiroshi TANAKA, Takeshi HORIKAWA, H ...
1984 Volume 33 Issue 9 Pages
632-635
Published: September 15, 1984
Released on J-STAGE: September 07, 2010
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Background radioactivity levels in Niigata city area were studied through the years of 1981-1984. As the results, it was found that the gross β-
radioactivity in underground (well) water samples were comparatively higher than those of other ground water samples. Ion chromatographic and γ-
ray spectroscopic determination revealed that this higher radioactivities were contributed by 40K
rather than radium or thorium series nuclides or fallout originated 90Sr.
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Osamu TAMEMASA, Rensuke GOTO, Atsushi TAKEDA, Masayuki YANO
1984 Volume 33 Issue 9 Pages
636-638
Published: September 15, 1984
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The usefulness of 99mTc-
labeled DL-homocysteine as a tumor imaging agent was further supported by high concentration distribution into the tumors of human lung or stomach tumorbearing nude mice.
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Kei AOYAMA, Yoshio HIGASHIYAMA, Shigemasa ENOMOTO
1984 Volume 33 Issue 9 Pages
639-642
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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Junji KONISHI, Tadako KOUSAKA, Takashi MISAKI, Tetuo NAKAJIMA, Yasuhir ...
1984 Volume 33 Issue 9 Pages
643-646
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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—Distribution of air and He+O2 mixed gas—
Yoshitaka MURAKAMI, Yutaka MORI, Takao SHIMADA, Kenji KAWAKAMI
1984 Volume 33 Issue 9 Pages
647-649
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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Kesato ICHIKAWA, Yuji YOSHIMURA, Naoya IWASAKI, Haruo IWAKURA, Toshiyu ...
1984 Volume 33 Issue 9 Pages
650-653
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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Nobuaki OTSUKA, Rikushi MORITA, Yasumasa KAJIHARA, Masao FUKUNAGA, Aki ...
1984 Volume 33 Issue 9 Pages
654-657
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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Kazuta KITAHARA, Kumiko HARADA, Yoko KITAHARA, Naotake OGAWA, Atsushi ...
1984 Volume 33 Issue 9 Pages
658-659
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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Subcommittee for Standardization of Radionuclide
1984 Volume 33 Issue 9 Pages
660-673
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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1984 Volume 33 Issue 9 Pages
A65P-A96M
Published: September 15, 1984
Released on J-STAGE: July 21, 2010
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