RADIOISOTOPES

Effect of ⁶⁰Coγ-Ray Irradiation on Dilute Aqueous Solution of Phthalate

Teijiro MIYATA, Michimasa ARAI, Akihisa SAKUMOTO, Masamitsu WASHINO

1979 Volume 28 Issue 8 Pages 479-484
Published: August 15, 1979
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_479

JOURNAL FREE ACCESS

Show abstractHide abstract

Radiolysis of dilute aqueous solution of dimethyl phthalate, DMP, with ⁶⁰Co γ-rays was investigated by using UV and IR spectrophotometric methods, gas chromatography, high-speed liquid chromatography. For both nitrogen- and oxygen-saturated solutions, an approximately linear relationship was held between the consumption of DMP and dose. The yield for the decomposition of DMP, G (-DMP), was 2.3 for the oxygenated and 1.6 for the deoxygenated solutions. The decomposition of DMP is initiated by the attack of hydroxyl radical on the benzene ring. Hydrated electrons, however, do not contribute to the decomposition. It was stongly suggested from the UV and IR spectral changes of DMP solutions induced by the irradiation that the elimination of the substituent on the benzene ring together with the ring cleavage reaction occur at rather early stages of the decomposition in the presence of oxygen. Organic acids such as formic, oxalic, and fumaric acids were identified as major products after the high dose irradiation of the oxygenated solution. The irradiation also gave rise to the significant reduction in the total organic carbon (TOC) in the presence of oxygen. The reduction of TOC was nearly the same as the amount of CO₂ produced, indicating that in the presence of oxygen, DMP is completely decomposed by radiation into CO₂.

View full abstract

Download PDF (685K)
Uptake of Uranium by Various Cell Fractions of Chlorella regularis

Takao HORIKOSHI, Akira NAKAJIMA, Takashi SAKAGUCHI

1979 Volume 28 Issue 8 Pages 485-488
Published: August 15, 1979
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_485

JOURNAL FREE ACCESS

Show abstractHide abstract

To know what kinds of the cell components of Chlorella regularis are concerned with uranium binding, uptake of uranium by various cell fractions was examined. The uptake value (μgU/mg starting dry cells) of the hot water-treated cells was almost the same as that of the starting dry Chlorella cells, showing that the cell components extracted with hot water were not so concerned with uranium binding. The cell components extracted with dilute alkali seemed to play an important role in uranium binding, and those extracted with chloroform-methanol seemed to be partly concerned with uranium binding. The cellulose fraction of the cells was scarcely concerned with uranium binding. In the dry cells, 34% of uranium taken up existed in the cell walls. However, in the living cells, 85% existed in the cell walls. The above results showed that the dry or the hot water-treated cells are the most convenient for uranium recovery from the aqueous systems.

View full abstract

Download PDF (371K)
Radiorespirometric Analysis of Glucose Metabolism in the Rat during Feeding with 3'-Methyl-4- (dimethylamino) azobenzene

-Radiorespirometry using [1-¹⁴C] glucose-

Shyuji KOJIMA, Nagatoshi ISHII, Yasuko SHIKI, Akiko KUBODERA

1979 Volume 28 Issue 8 Pages 489-493
Published: August 15, 1979
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_489

JOURNAL FREE ACCESS

Show abstractHide abstract

We estimated the enzyme activities on the hexose monophosphate oxidative pathway of glucose metabolism at an early stage during feeding with 3'-methyl-4- (dimethylamino) azobenzene (3'-Me-DAB) in the first paper of this series. In the present paper, the importance of this non-glycolytic pathway of glucose metabolism in preneoplastic liver in azo-dye fed rat was studied by radiorespirometry using [1-¹⁴C] glucose and [6-¹⁴C] glucoce. In addition to radioisotope analysis, the level of activity of glucose-6-phosphate dehydrogenase was measured in rat liver after various periods of feeding with 3'-Me-DAB.
In radiorespirometry using [1-¹⁴C] glucose, the peak time was delayed up to the 2nd week, but was early by the 4th week and was the same as the control at the 5th week and thereafter. On the other hand, the peak height and the yield value both changed in almost the same way. That is to say, they were lower than those of the control until the 2nd week, began to increase from the 3rd week, reached a maximum at the 4th week, and remained at the control level at the 5th week and thereafter. Moreover, the yield value ratio of respiratory ¹⁴CO₂ from [1-¹⁴C] glucose to that from [6-¹⁴C] glucose increased from 1.3 to 1.52 at the 3rd to 4th week after feeding with 3'-Me-DAB.
The activity of glucose-6-phosphate dehydrogenase increased as early as the 2nd week after the start of feeding with 3'-Me-DAB, reaching a maximum at the 4th week. Thereafter, the activity remained high with a slight decrease from the maximum by the 6th week.
The incorporations of [³H] thymidine and [U-¹⁴C] glucose into rat liver DNA at the 4th week after feeding with 3'-Me-DAB were both as high as 2 to 4 times those of the control.

View full abstract

Download PDF (535K)
Single Photon Radioisotope Emission Computed Tomography Image Using Gamma Camera

Yoshihisa AKIYAMA, Fujimi KINOSHITA, Masaki KOAKUTSU, Suho SAKATA, Nob ...

1979 Volume 28 Issue 8 Pages 494-499
Published: August 15, 1979
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_494

JOURNAL FREE ACCESS

Show abstractHide abstract

Single photon radioisotope computed tomography (RCT) images were obtained using the following devices such as conventional gamma camera, data processer for exclusive use of nuclear medicine (C.D.S.-4096), magnetic tape and medium size electronic computer FACOM 230-28S (48K) for multipurposes, which are routinely used for clinical purpose.
To reconstruct the RCT image we made absorption correction by geometric mean of opposing counts considering the thickness of source and used the convolution integral method.
The reconstructed images of phantom study resolved one centimeter clearly and were very similar to original.
The RCT image of patient was acquired by the rotation of patients using the revolving chair and the handmade implement which settles the center of patient's head.
Three dimensional informations were obtained by one examination with a gamma camera which collects two dimensional images. When using a gamma camera, therefore, not only a transaxial but an arbitraly RCT image will be important to contribute for diagnosis.

View full abstract

Download PDF (6122K)
A Comparative Study, by Objective Quantization Using Microdensitometry, between Cardiac Pool Images Obtained Using Red Blood Cells Labeled in vivo with ^99mTc and Using ^99mTc-human Serum Albumin

Michimasa MATSUO, Takayoshi UEHARA, Shinjiro YOSHIMOTO, Shoji NISHIYAM ...

1979 Volume 28 Issue 8 Pages 500-505
Published: August 15, 1979
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_500

JOURNAL FREE ACCESS

Show abstractHide abstract

A detailed comparison was performed subjectively and objectively between the quality of cardiac pool images obtained using red blood cells lebeled in vivo with ^99mTc and ^99mTc-human serum albumin. Both methods gave cardiac pool images of high quality. In order to compare the images between both methods, the microdensitometry was performed in both images of the same patients along the line drawn through the center of the left ventricular image and the septal image. Measuring the highest density of left ventricle as C_L and that of septum as C_s, the index I (I_I) was obtained as (C_L-C_s) and the index II (I_I) was calculated as (C_L-C_s) / (C_L +C_s) . The objective comparison was performed by these indices. The method using red blood cells labeled in vivo with ^99mTc resulted in subjectively superior images and a higher left ventricle-to-septum density ratio in cases of control groups, myocardial infarction and aortic valvular disease. But in cases of mitral valvular disease and arrhythmia the in vivo method resulted in inferior or almost equal to the method obtained using ^99mTc-HSA. The quantitative indices used in this study can be thought to represent the contrast between the left ventricular image and the septal image. A better contrast may be obtained in a better image and may contribute more to the clinical diagnosis. From the point of clinical contribution, both agents are suitable for radionuclide imaging of the cardiac chambers. And the adequate combination of both method may be useful for clinical diagnosis.

View full abstract

Download PDF (2138K)
Rapid Source Preparation by Aluminium Treatment and Its Application

Hiroshi MIYAHARA, Tamaki WATANABE

1979 Volume 28 Issue 8 Pages 506-507
Published: August 15, 1979
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_506

JOURNAL FREE ACCESS

Download PDF (191K)
On the Analysis of Decay Curve and Its Bunney Plot of Rn and Tn Mixture

Kimiko HORIUCHI, Yukio MURAKAMI

1979 Volume 28 Issue 8 Pages 508-510
Published: August 15, 1979
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_508

JOURNAL FREE ACCESS

Download PDF (330K)
Trapping of Tritiated Water Vapor Absorber

Hisayo MIZUNO, Katsumi AOKI, Noboru KASHIWAGI

1979 Volume 28 Issue 8 Pages 511-513
Published: August 15, 1979
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_511

JOURNAL FREE ACCESS

Download PDF (281K)
Incineration of Waste Liquid Scintillator

Katsumi AOKI, Juhei SAITO, Ko TAKI, Noboru KASHIWAGI, Shozo HASHIMOTO

1979 Volume 28 Issue 8 Pages 514-516
Published: August 15, 1979
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_514

JOURNAL FREE ACCESS

Download PDF (289K)
Comparison of CEA Levels by the One Step and the Two Step Sandwitch Method

Yoshihiko OSHIUMI, Ikuko YAMAGUCHI, Misae TESHIBA, Keiichi MATSUURA

1979 Volume 28 Issue 8 Pages 517-518
Published: August 15, 1979
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_517

JOURNAL FREE ACCESS

Download PDF (183K)
Measurements and Evaluation Methods of Environmental Gamma Radiation Dose Less than 5 mrem/y Due to Nuclear Facilities

Shigeru MORIUCHI

1979 Volume 28 Issue 8 Pages 519-527
Published: August 15, 1979
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_519

JOURNAL FREE ACCESS

Download PDF (1200K)
Radioactive and Radiation Standards (VI)

5. Sealed Radioactivity Standards for General Use

Tatsuji HAMADA

1979 Volume 28 Issue 8 Pages 528-536
Published: August 15, 1979
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_528

JOURNAL FREE ACCESS

Download PDF (1005K)
[title in Japanese]

1979 Volume 28 Issue 8 Pages A1943-A8
Published: August 15, 1979
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.28.8_A1943

JOURNAL FREE ACCESS

Download PDF (3425K)

Register with J-STAGE for free!