RADIOISOTOPES

On the Formation of Organic Iodine by Reactions of Iodine Released from Irradiated Fuel with Several Gaseous Materials

Kazumi IWAMOTO, Teruo KIKUCHI

1970Volume 19Issue 10 Pages 439-445
Published: October 15, 1970
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_439

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The formation of organic iodine by reactions of iodine released from irradiated U₃O₈ with several materials such as air, CO₂, H₂O, CH₄, and C₄H₁₀ and of vaporized AgI with such ones as air, CH₄, and CH₃OH was preliminarily studied. The formation of the organic iodine was noticed in both cases when the iodine released from the irradiated U₃O₈ reacted with CH₄ or C₄H₁₀ gas and when the AgI did with CH₄ gas or CH₃OH vapor. The yield of the organic iodine increased with increases in reaction time and the gas concentration. It was found in case of the irradiated U₃O₈ that the organic iodine was formed predominantly by a gas-solid reaction between CH₄ gas and the iodine deposited on the wall of the reaction space rather than by a gas phase reaction between released iodine in vapor state and the gas. The yield of the organic iodine increased with increase in the decomposed fraction of the uranium iodide released from the irradiated U₃O₈ or the vaporized AgI. In cases of air, H₂O, CO₂, the organic iodine formation was thought to be suppressed.

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Conditions of Measurement by Res-O-Mat T₄ Kit-Test

Results Obtained with 300 and over Subjects

Takeyoshi IMAEDA, Kouhei SENDA

1970Volume 19Issue 10 Pages 446-453
Published: October 15, 1970
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_446

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The Res-O-Mat T₄ test system is one of in vitro methods for the determination of total thyroxine in serum. The authors reviewed in many respects the conditions of measurement by Res-O-Mat T₄ kit using 300 and over subjects as follows:
1. Radioactivity of each incubation vial,
2. Effect of incubation time,
3. Effect of temperature of incubation,
4. Effect of extraction alcohol,
5. Effect of gradient of standard curve,
6. Fluctuation of T₄ values,
7. Effect of rotation speed,
8. Determination of T₄ values above 18μg%,
9. Each T₄ value of euthyroid, hypothyr'oid and hyperthyroid,
10. Comparison with Triosorb test or Tetrasorb test.
The Res O Mat T₄ test has been proved to be valuable as clinical thyroid function test.

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Thyroid Function Test Using Res-O-Mat T₃ Kit

Katsushi WATANABE, Masataka INAKURA, Makoto TANAKA, Kenji KOGA

1970Volume 19Issue 10 Pages 454-457
Published: October 15, 1970
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_454

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Astudy to assess relative accuracy of the results of Res-O-Mat T₃ test in correlation with several conventional thyroid function tests was performed.
1) Scatter of radioactivity in vials of each kit was within three per cent; this indicates remarkably high homogeneity (Table 1) .
2) Assay errors;
The difference between TBC indices of two serum samples of each case averaged 0.04, thereby indicating fairly small errors in assay (Table 2) .
3) Effect of various lengths of incubation time;
When the incubation temperature was not lower than 25°C, there were no significant differences between the assay results obtained with one-hour incubation and two-hour incubation. When the incubation temperature was about 20°C, there were significant differences between assay results of the one-hour and two-hour incubations.
4) Normal range of TBC index;
The TBC index ranged from 0.87 to 1.07 with an average of 0.98 in the group of euthyroid individuals, from 0.58 to 0.87 with an average of 0.75 in the group of hyperthyroid patients, and from 1.02 to 1.34 with the mean index of 1.21 in the group of hypothyroid state. The normal range, accordingly, was considered to be 0.85-1.10.
5) Correlation between the TBC index and the Triosorb results;
A fairly good correlation was observed between the TBC index and the Triosorb assay results.
The data support the feasibility of the use of Res-O-Mat T₃ test system as a simple routine diagnostic tool for assessment of thyroid function.

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^113mIn-EDTA Preparation Method

Keiki TANNO

1970Volume 19Issue 10 Pages 458-461
Published: October 15, 1970
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_458

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Preparation of ³¹Si from (n, p) Reaction

Shoji BANDO

1970Volume 19Issue 10 Pages 462-464
Published: October 15, 1970
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_462

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The Synthesis of ³⁵S-dl-a-Tocopherothiol acetate

Kimio HAMAMURA, Tsuneo MATSUURA, Shizumasa KIJIMA

1970Volume 19Issue 10 Pages 465-468
Published: October 15, 1970
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_465

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γ-Ray Irradiation Effect on Dielectric Properties of BaTiO₃ Ceramics

Shigeo KOBAYASHI, Kikuo YATABE

1970Volume 19Issue 10 Pages 469-472
Published: October 15, 1970
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_469

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Radioactive Dating

Kunihiko KIGOSHI

1970Volume 19Issue 10 Pages 473-481
Published: October 15, 1970
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_473

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Radiation Safety Technique (X) Measures against Radiation Accidents

Yoshito YAMAOKA

1970Volume 19Issue 10 Pages 482-487
Published: October 15, 1970
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_482

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[title in Japanese]

1970Volume 19Issue 10 Pages A1091-A644
Published: October 15, 1970
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.19.10_A1091

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