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Volume 14, Issue 1
Displaying 1-12 of 12 articles from this issue
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Takeshi A. IINUMA, Norimasa NOHARA, Eiichi TANAKA, Toshiyuki HIRAMOTO, ...1965 Volume 14 Issue 1 Pages 1-7
Published: January 15, 1965
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA whole body counter has been built utilizing eight units of plastic scintillation detectors at National Institute of Radiological Sciences. A detector unit is made of a plastic scintillator (50cm×50cm×15cm) and four 5 in diameter photomultipliers which are optically coupled to a surface of the scintillator via light guides. In the first report we describe the response of the unit to four kinds of monochromatic γ-rays (137Cs, 65Zn, 40K and ThC'') in the energyrange between 0.662 and 2.62 MeV. Each γ-ray spectrum obtained showed an asymmetrical peak having a broad tail on the low energy side. A linear relationship was observed between pulse heights at the peak and the maximum energies of Compton-recoiled electrons at first collision, intersecting the energy axis at about 50 keV. “Half Resolution” that is the relative half width at half maximum in the high energy side of the peak was calculated for the four spectra, and found to be 28.6% for 137Cs, 18.3% for 65Zn, 15.7% for 40K and 12.1% for ThC'', respectively. The “Half-Resolution” was analyzed following the method developed by Burch (Proc. Phys. Soc., 77, 483, 1961), results of the analysis being compared with those of the plastic scintillator at Leeds University. It was found that the observed “Half-Resolution” was reasonable for the present set-up of the detector. Several modifications are suggested in order to extract better performance from the detector.View full abstractDownload PDF (775K) -
—Determination of Uranium in Aluminium—Masatoshi KOBAYASHI, Sumiko NAGATSUKA, Kunihiko HIGASHI1965 Volume 14 Issue 1 Pages 8-12
Published: January 15, 1965
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESS239Np, which is produced by the thermal neutron activation of uranium 238 (neutron flux1.7×1012 n/cm2⋅sec), was extracted selectively by TTA benzene solution under a suitable acid condition. Measuring the activity of 239Np, we were able to determine 0.1 to 0.2 ppm of uranium in high purity aluminium. In this method, extraction of U, Pu or Pa was negligible and that of Sc was less than 3%. This method enables a rapid and simple procedure and permits the determination of as small amount of uranium as 0.03 ppm in aluminium.View full abstractDownload PDF (428K) -
Akiyo SHIGEMATSU, Masakazu AOKI, Tomoyoshi KOMAI, Toru SUEYOSHI, Itiro ...1965 Volume 14 Issue 1 Pages 13-17
Published: January 15, 1965
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA new microautoradiography technique has been presented for some 3H-labeled compounds, including the hydrophylic and partly lipophylic characters. The method which was invented was based on 1) the prevention of remove of 3H-labeled compounds or their related components from the locality of the cells or the tissues into which the compounds were incorporated, 2) the contribution of the condition on which the biological incorporation of the 3H-labeled compounds into the cells or the tissues was taken account, but the physical difusion no account, and 3) the use of the tissue pieces by serial section technique, the use of two nuclear emulsions which had each other different sensibilities, and the contribution of the exposure times in order to supply the narrow limitation of semiquantitative analysis by microautoradiography. According to the results of the incorporation of 3H-Isoniazid into the lesion parts of the human lung infected with tubercle bacilli, using the new technique, 3H incorporation rate into the encapsulated wettish-caseous foci was very low compared with that into the other kinds of the lesions. The above results give a great important value for biology and medicine.View full abstractDownload PDF (4557K) -
Yoshiki WADACHI, Yukio KAWANO, Yuzo TAJIMA1965 Volume 14 Issue 1 Pages 18-23
Published: January 15, 1965
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSIn order to survey a suitable protective cloth, which is used in the hot laboratory, 11 kinds of fabrics, that is, hemp, hemp-cotton, cotton, hemp-vinylon and etc., are measured their decontaminabilities for 90Sr-90Y. Each sample of fabrics is consisted with three types, namely, untreated cloth, silicagel sizing cloth and silicon water protected cloth. Results obtained show that hemp and cotton are good material for the protective cloth and particularly cotton is the most excellent one among them in respect of practice and economy.View full abstractDownload PDF (497K) -
Kin-ichi HISADA, Hiroshi KAWANISHI, Kunio TOBE, Hiroyuki MIYAMURA1965 Volume 14 Issue 1 Pages 24-32
Published: January 15, 1965
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSSeveral evaluation methods of renogram hitherto have merely the geometrical analysis and calculation of the obtained curves, however they lack themselves physiological and theoretical endorsement.
Firstly, it was proved through our experiment using 131IHSA that it took 2-3 minutes for the administered radioactive substance to mingle equally with circulating blood. This fact led to the conclusion that it needs to exclude the initial 2-3 minutes' portion of the renogram curve in the precise evaluation of the renogram.
We established 7 compartments as kinetics model of 131I-Hippuran and knew that renogram recorded up to 40 minutes could be expressed as figures of the sum of the 3 exponential functions.
Analysis procedures of the reno gram and heart curve are summarized as follows:
1) Plot the reno gram and heart curve obtained two minutes after the intravenous administration of 131I-Hippuran over the semilog-paper as shown in Fig.6.
2) Heart curve shows straight line after 20-30 minutes. Second straight line (r2) is obtained by subtracting the first line (r1) from the initial curve. Renogram curves can be analysed into 3 straight lines in the same way. The straight line other than r1 and r2 which have the same slope with heart curve is α23.
3) Name the intersection of the third line of the both side of renogram to the zero time as L′ and L″ respectively.
4) Read T1/2 and L′ L″ of the r1, r2, α′23 and α″23
5) Name the time when the both renogram shows the maximum value T′1 and T″1 respectively.
6) The shifting velocity of the 131I-Hippuran can be obtained quantitatively as follows.
extravascular→intravascular
α41=r1
intravascular→r-renal parenchym
α′12=r2α′23L′eα″23T″1/α′23L′eα″23T″1+α″23L″eα′23T′1
intravascular→1-renal parenchym
α″12=r2α″23L″eα′23T′1/α′23L′eα″23T″1+α″23L″eα′23T′1
r-renal parenchym→r-renal tubule, calyx and pelvis α′23
1-renal parenchym→1-renal tubule, calyx and pelvis α″23
ri=0.693/Ti1/2View full abstractDownload PDF (780K) -
Nobuo OKAJIMA1965 Volume 14 Issue 1 Pages 33-41
Published: January 15, 1965
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSPossibility of planning standarization of radiochemical laboratories is explained, especially laboratories are classified according to low-and intermediate radiation level, and to the scale of small and intermediate facilities. Planning standarization is based on two premises, first of all, considered most important condition that space requirements for research do not vary substantially with the type of research. For 1 st premise; planning standarization is based on standarization of equipment and criterion of radiation control necessary to protect workers from radiation hazard. 2 nd: Major economies and flexibilities for any type of research facility can be effected by 3 S system, that is, Standarization, Simplification, and Specialization of equipments.
Application of these ideas is valuable in the design of laboratories and trial examples shown. Module of equipment is applied to experimental bench, sink, and chemical hood (both types of Oak Ridge and California), and module of building planning is applied for room size control and room arrangement keeping close correlation with space module of experiment and research.
Pattern of air current and velocity of ventilation must be cotrolled to keep contaminated aerosols from falling down on the floor of room concerned, and to take of them by exhaust ventilation. For such a requirements, correlation between air current velocity and room length along air current direction are checked by the method of ventilation control to the length. of room adopted in the design of the clean room.View full abstractDownload PDF (738K) -
[in Japanese], [in Japanese]1965 Volume 14 Issue 1 Pages 42-44
Published: January 15, 1965
Released on J-STAGE: July 21, 2010
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1965 Volume 14 Issue 1 Pages 45-47
Published: January 15, 1965
Released on J-STAGE: July 21, 2010
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1965 Volume 14 Issue 1 Pages 48-51
Published: January 15, 1965
Released on J-STAGE: July 21, 2010
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[in Japanese]1965 Volume 14 Issue 1 Pages 52-64
Published: January 15, 1965
Released on J-STAGE: July 21, 2010
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[in Japanese]1965 Volume 14 Issue 1 Pages 65-71
Published: January 15, 1965
Released on J-STAGE: July 21, 2010
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1965 Volume 14 Issue 1 Pages A429-A112
Published: January 15, 1965
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (5144K)
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