RADIOISOTOPES

The Investigation of Isotope Analysis by Activation Analysis

In the case of Coexistent Indicator System ⁶Li-⁵⁵ Mn

Mutsuaki SHINAGAWA, Akira OYOSHI, Kazuyoshi FURUSHIMA, Kumao UCHIDA, M ...

1968 Volume 17 Issue 3 Pages 103-107
Published: March 15, 1968
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.17.3_103

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In the present investigation, the determination of ⁶Li has been carried out by coexistent indicator method. Coexistent system of ⁶Li-⁵⁵Mn was irradiated by thermal neutron which would be preferentially captured by ⁶Li before causing (n, γ) reaction of ⁵⁵Mn. Therefore, induced activity of ⁵⁵Mn depended on the content of coexistent ⁶Li. The thermal neutron flux was 10⁴n ⋅ cm^-2⋅ sec^-1. Cadmium ratio was 10. 4. Natural Li (abundance ratio of ⁶Li : 7, 42%) was used as a standard sample. As the experimental result, the relation between activity of ⁵⁵Mn, y (cpm), and ⁶Li concentration, x (mg) for 5 ml of 2 M MnSO₄ was obtained as follows:
logy = -0. 012 x + 4, 673.

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Systematic Radioactivation Analysis of Trace Elements in Rice Plant

Determination of Halogen Elements

Yuzuru KUSAKA, Haruo TSUJI, Masaki SHINOGI

1968 Volume 17 Issue 3 Pages 108-112
Published: March 15, 1968
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.17.3_108

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The 0.5-g samples of seed, stem, leaf, chaff and grain collected from a batch of rice plant were activated with thermal neutrons in an atomic reactor for 30 min. After the activation the samples were decomposed by a conc. H₂SO₄ and conc. HNO₃ mixture together with KCl, KBr, and KI carriers. During the process the distillate was absorbed in a cold 5N NaOH solution, Then iodine was isolated by a reduction procedure with hydrazine sulfate and a following oxidation with sodium nitrite in nitric acid medium, and extracted into a CCl₄ phase. A gamma-ray spectrometry of ¹²⁸I had been done on the AgI precipitate obtained through a back-extraction of iodine from the CCl₄ to an aqueous phase containing Na₂SO₃. For the other two elements a mixed precipitate of AgBr and AgCl was produced from the remaining aqueous phase after the iodine extraction. And immediately a gamma-ray spectrum of ³⁸Cl was measured. After the ³⁸Cl decay, that is one day interval, a spectrum of ⁸²Br could be measured on the same precipitate. The chemical yields were more than 50% for iodine and almost quantitative for bromine and chlorine, and the separation time were about 40 min for iodine and 90 min for the others.
The method have elucidated some interesting metabolic effects on the distribution of halogen elements in organ of rice plant that chlorine tends to be concentrated in seed, especially in grain, and bromine and iodine in leaf. The method can be combined with the previous one for Mn, Mg, K, Na, Cu, and Zn, reported in this bulletin, Vol.16, No.10, p, 526, 1967, to make a sequential activation analysis for these elements.

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The Whole Body Autoradiographic Studies on the Distribution of Radioisotopes (XII)

Distribution of a Local Anesthetic, 2-Methyl-2-n-propylaminopropion-o-toluide Hydrochloride (LA-012) in Guinea Pigs

Mari SAKUMA, Yoshishige SATO

1968 Volume 17 Issue 3 Pages 113-121
Published: March 15, 1968
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.17.3_113

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The distribution of a new local anesthetic, 2-methyl-2-n-propylaminopropion-o-toluide hydrochloride (LA-012) in guinea pigs was studied by the whole body autoradiographic technique.The drug labelled with tritium (³H-LA-012) was injected subcutaneously in the animals, and their whole body sections with about 40 microns in thickness were prepared using cold microtome at various intervals from 10 minutes to 24 hours after the injection. Whole body autoradiographic picture were developed after the sections were exposed to the films for about 5 weeks. The autoradiogram revealed that ³H-LA-012 was absorbed rapidly and a little or no radioactivity was remained at the site of injection after 60 minutes. The radioactivity in the liver, kidney, gastrointestinal contents, gall bladder, salivary gland and infraorbital gland reached to the highest density after about 30 minutes. This rapid accumulation was followed by a slow decline, but the autoradio gram at 24 hours showed only a faint activity in the liver and intestinal tract. A characteristic high accumulation and retention of radioactivity was found in the various connective tissues, such as dense connective tissue in the derma, tendon, auricular cartilage, costal cartilage and so on.

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Determination of the Relative Content of U-235 in Enriched Uranium by Alpha-Gamma Coincidence Method Using a Gridded lonization Chamber

Mitsuhiro MIYAJIMA, Tadayoshi DOKE

1968 Volume 17 Issue 3 Pages 122-124
Published: March 15, 1968
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.17.3_122

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[title in Japanese]

[in Japanese]

1968 Volume 17 Issue 3 Pages 125-138
Published: March 15, 1968
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.17.3_125

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[title in Japanese]

[in Japanese]

1968 Volume 17 Issue 3 Pages 139-146
Published: March 15, 1968
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.17.3_139

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[title in Japanese]

1968 Volume 17 Issue 3 Pages A843-A408
Published: March 15, 1968
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.17.3_A843

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