RADIOISOTOPES

Study of the Distribution of Chrome in 17 Cr Stainless Steel by Autoradiography Using ⁵¹Cr

Kazue NIIZUMA, Koki GUNJI

1981 Volume 30 Issue 8 Pages 425-430
Published: August 15, 1981
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_425

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The segregation of alloying elements in steels even as small as undetectable in X-ray miroanalysers seems to affect physical properties for instance, the ridging phenomenon in a 17 Cr stainless steel sheet due to fine winkles of the surface by drawing, the mechanism of which is not yet clear.
Study was made of a method for detecting small segregations by autoradiography using ⁵¹Cr for the 17 Cr stainless steel. In results, (1) in the steel containing a 0.025% carbon or no carbon content, a small variation in photographic density relating to the concentration of chromium was found. (2) In the case of the steel with a 0.05% carbon content, similar one to commercial steel, a clear photographic density variation was observed which was considered to be a cause of the ridging. (3) The autoradiography is suitable to investigation of the small segregation undetected by an X-ray microanalyses.

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The Influence of Whole Body ⁶⁰Co-irradiation on Distribution of ⁶⁷Ga in Tumor-bearing Mice

Hiromi WAKAO, Akira SHIMURA, Tomomitsu HIGASHI

1981 Volume 30 Issue 8 Pages 431-436
Published: August 15, 1981
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_431

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Since the initial findings that ⁶⁷Ga has a preferential affinity for soft tissue tumors, in humans numerous suggestions have been advanced for the basic mechanism involved. The effects produced by whole-body X-irradiation on the excretion and tissue distribution of ⁶⁷Ga have been reported by Swartzendruber and others. Bradley and coworkers have shown that these irradiation effects were associated with an increase in serum iron.
The present investigation was undertaken in order to study the relationships between the change in the serum iron concentration and ⁶⁷Ga accumulation in the tumor and soft tissues in mice bearing Ehrlich's ascites tumor. The following results were obtained.
(1) The serum iron concentration was significantly decreased between 3 and 6 hours after 10 Gy (1, 000 rad) dose of whole-body ⁶⁰Co-irradiation. Subsequently, the serum iron levels were slowly elevated.
(2) The uptake of ⁶⁷Ga in the tumor and soft tissues was increased if the serum iron concentration was decreased by whole-body ⁶⁰Co-irradiation during the early phase. On the contrary, if the serum iron concentration was high, the uptake of ⁶⁷Ga in the tumor was decreased.
(3) The excretion of⁶⁷Ga from the body was delayed if the serum iron concentration was decreased by whole-body ⁶⁰Co-irradiation. However, if the serum iron concentration was high, the excretion of ⁶⁷Ga from the body significantly increased.

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Development of a Grain Irradiator

—Relation between dimension of the irradiator and grain flow in an irradiation region—

Tatsuo HOSHI, Susumu TANAKA

1981 Volume 30 Issue 8 Pages 437-442
Published: August 15, 1981
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_437

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A grain irradiator was deviced for the radiation disinfestation of rice. In this irradiator, dose of rice was varried through regulation of rice velocity in irradiation region. The velocity was regulated by variation of opening area and time of an annular gate valve setted at the bottom of the region. For the irradiator design, experiments of rice flow in the region were conducted by a pilot plant of the irradiator.
The main results are as follows: (1) Flow rate of rice from slits of the valve independed on curvature of arrangement of the slits, (2) The flow rate was controlled within 2.7 %, (3) Standard diviation of the velocity of a rice grain in an irradiation region was 1.8%, (4) Distribution of the velocity was uniform within 1% with no inclination of shutter of the valve to the slit, (5) Rice were not damaged by mechanical action of the irradiator.

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Development of a Grain Irradiator

—Dose rate distribution in an irradiation region—

Tatsuo HOSHI, Susumu TANAKA

1981 Volume 30 Issue 8 Pages 443-448
Published: August 15, 1981
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_443

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The dosimetry was performed in order to evalute accuracy of an approximation formula of dose rate in multi-layer of rice separated with thin iron cylinders. Main results are; (1) Energy absorption build-up factor of multi-layer of rice was independent of radius of the multi-layer, radius and thickness of the iron cylinder and an incident angle of gamma-ray to the multi-layer. (2) Approximation formula of the build-up factor of the multi-layer was consisted with Broder's approximation formula of the build-up factor in multi-layer and previously introduced formula of the build-up factor in infinite medium. (3) Derived value of the build-up factor from dosimetry agreed with approximated values within ±3%. Standard deviation of the derive values was 7%. (4) In the irradiation regions of a pilot scale irradiator, approximated values of dose rate agreed with the measured values within ±8.5%. (5) Approximated values of dose of rice passed through the region agreed with the measured values within ±5.7%.

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Stable- and Radio-nuclide Concentrations in Organs of a Dolphin

Noriyuki MOMOSHIMA, Yoshimasa TAKASHIMA, Yusuke NAKAYAMA

1981 Volume 30 Issue 8 Pages 449-451
Published: August 15, 1981
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_449

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Preparation of Tetramethylcyclopropanecarboxylic-¹⁴C Acid and Insecticidal Terallethrin-¹⁴C from It

Akira YOSHITAKE, Hideyuki GOMI, Iwao NAKATSUKA

1981 Volume 30 Issue 8 Pages 452-454
Published: August 15, 1981
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_452

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A Thyroid Function Text by the T₃-macroaggregated Albumin Uptake (T₃MAAU)

Masatsugu SUZUKI, Yoshikatsu MIYAMOTO, Satoshi IIJIMA, Masayuki SUWO

1981 Volume 30 Issue 8 Pages 455-457
Published: August 15, 1981
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_455

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Bone Scintigraphy with ^99mTc-hydroxy Methylene Diphosphonate (^99mTc-HMDP)

Susumu OKAHASHI, Tetsuro ISHIMARU, Hiroko MAEDA, Tsunehiko SAKATA, Koi ...

1981 Volume 30 Issue 8 Pages 458-460
Published: August 15, 1981
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_458

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Application of Nuclear Techniques in Geotechnical Engineering

Tsuyoshi YAMAMOTO

1981 Volume 30 Issue 8 Pages 461-470
Published: August 15, 1981
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_461

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Secular Change of Background Activity in Ge (Li) Detector

Jiro SAKURAI, Kazuhisa KOMURA

1981 Volume 30 Issue 8 Pages 471-474
Published: August 15, 1981
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_471

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[title in Japanese]

1981 Volume 30 Issue 8 Pages A2147-A220
Published: August 15, 1981
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.30.8_A2147

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