RADIOISOTOPES

Formation of Metal Colloids in Ionic Crystals by Electron Irradiation and Its Application to High-level Dosimetry

Katsuyuki INABE, Shigehiro OWAKI, Nozomu TAKEUCHI

1991Volume 40Issue 2 Pages 53-57
Published: February 15, 1991
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_53

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Metal colloids formed after electron irradiation in ionic crystals were examined with the aim to use them for evaluation of high-level radiation dose. Optical absorption band of Nacolloids in NaCl was most useful for the measurement among that of several kinds of ionic crystal examined. Photoacoustic spectroscopy (PAS) was newly used for estimation of the Na-colloids in NaCl. A good response of the PAS signal to the number of electron pulses was obtained in the range from 10⁷ to 10⁹ Gy. It was also shown that thermal annihilation of the colloids yields a thermoluminescence glow peak which may also provide a useful method for high-level radiation dose.

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Study on the Distribution of T Lymphocytes in Mice

Shigeaki YOKOTA, Kazuhiko NAKANE, Masaki MAEDA, Keiko MATSUO, Yumiko S ...

1991Volume 40Issue 2 Pages 58-63
Published: February 15, 1991
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_58

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Distribution of T lymphocytes was studied using ¹²⁵I-labeled Thy 1.2 monoclonal antibody which is supposed to be specific to Thy 1.2 antigen presented on the surface of mouse thymocytes. It became obvious that radio-labeled T lymphocytes in mice distributed in the blood and almost all of the organs except brain and spinal cord. The autoradiographic analysis by a bio-image analyzer system revealed that particular accumulation of radio-labeled T lymphocytes was found in brown fat, subcutaneous tissue and spleen. Their accumulation peaks were observed at 14 and 17 days after administration of the radio-labeled monoclonal antibody, respectively.

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Root Uptake of ¹⁴C-Labeled Glucose by Radish Seedling

Noriyuki MOMOSHIMA, Poppy Intan Tjahaja, Yoshimasa TAKASHIMA

1991Volume 40Issue 2 Pages 64-66
Published: February 15, 1991
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_64

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Assimilation of simple carbohydrate by root uptake was examined by cultivation of radish seedling in a solution containing glucose labeled with ¹⁴C. Activity in plant increased rapidly and showed 10 to 30 percent of that in the culture solution within 1 h. Activity in plant, however, did not exceed that in the solution after 11 days cultivation, indicating assimilation of glucose by root uptake is negligible under photosynthesis is active.

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Management of Contamination Record Using a Personal Computer

Nobuyoshi HAMADA, Hiroshi KAMEYAMA, Kazutoshi KIUCHI, Kunihide NISHIZA ...

1991Volume 40Issue 2 Pages 67-70
Published: February 15, 1991
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_67

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This paper describes a computer program for the classification of a surface contamination with radioisotopes to record numerous events from contamination to decontamination using a personal computer. This software enables a staff to print out numbers and contents of contantinations according to indices as well as whole data concerning each contamination. The relationships among causes of contamination, places contaminated and so on were easily analyzed. The data of comtamination were utilized for training users to handle radioisotopes more safely.

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An Equipment for Measuring Cosmic Ray Angular Distribution

—Development for non-destructive inspection of large scale structures—

Nobue AKIYAMA, Keiichi SUZUKI, Shoji TONOUCHI, Susumu MINATO

1991Volume 40Issue 2 Pages 71-74
Published: February 15, 1991
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_71

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As muons which are a major component of cosmic rays at the ground level have strong penetrating ability, they are possibly utilized as a radiation source for non-destructive inspection of large materials or geological survey.
To examine the feasibilities of them, we developed a cosmic ray measuring system using the coincidence counting method with two largearea plastic scintillators. After some fundamental tests, cosmic ray angular distribution (for zenith angle) measurement was made in an underground tunnel. The data obtained well represented the topography above the tunnel.

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Measurement of Blood Flow and Blood Volume of the Femoral Head by Positron Emission Tomography (PET) Using C¹⁵O₂ and C¹⁵O

Masato YAMASHITA, Tadashi INABA, Shunichi KUBO, Mariko IDE, Yo USHIJIM ...

1991Volume 40Issue 2 Pages 75-78
Published: February 15, 1991
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_75

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A preliminary study was carried out to evaluate whether the blood flow (F) of the femoral head can be measured by PET on the subjects (6 males, aged 54-84, mean 69.3 years) with prostate disorders (no bone lesions) . For the F study, C¹⁵O₂ was inhaled in a single breath with dynamic scan for 5 minutes. The blood volume (V) was determined by the C¹⁵O study. The F (mean±1 s.d.) was 14.0±7.8 ml/100 ml [tissue] /min, the partition coefficient was 0.112±0.054, and the V was 2.23±0.56 ml/100 ml.

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Radiation Sensors with New Measurement Principles Based on Cryogenic or Superconductive Phenomena

Kenji ISHIBASHI

1991Volume 40Issue 2 Pages 79-85
Published: February 15, 1991
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_79

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Development of a New Electrostatic Accelerator

—Present Status of the DISKTRON and Its Application

Akira ISOYA, Yoshinobu MIYAKE, Kiichi ETO

1991Volume 40Issue 2 Pages 86-98
Published: February 15, 1991
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_86

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[title in Japanese]

1991Volume 40Issue 2 Pages A7P-A20M
Published: February 15, 1991
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.40.2_A7P

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