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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Nuclear Engineering and Technology
Journal Basic Information
Journal DOI :
Korean Nuclear Society
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Volume & Issues
Volume 5, Issue 4 - Dec 1973
Volume 5, Issue 3 - Sep 1973
Volume 5, Issue 2 - Jun 1973
Volume 5, Issue 1 - Mar 1973
Selecting the target year
Partition Function of Electrons in Liquid Metals
Zhang, Hwe-Ik ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 77~82
A method of obtaining the partition function for a system of electrons is developed by defining a new density matrix, in which the Fermi statistics is explicitly incorporated. The corresponding Bloch equation is formulated and a practical method of solving the equation is obtained for weak potential. This theory is applied to structurally disordered ststems which might be reasonable models for liquid metals.
Protective Effect of Acetylbenzoylaconine Against Gamma-radiation
Moon, Philip S. ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 83~86
The protective effects of acetylbenzoylaconine, 2-aminoethylisothiouronium bromide hydrobromide,
-mercaptoethylamine HCI, and L-thiazolidine-4-carboxylic acid were studied on the white male mice, aged 5-6 weeks. The toxicity test of acetylbenzoylaconine revealed that the LD
was 2.5 mg/kg of body weight. After the administration of test substances, mice were irradiated with whole body dose of 800 rad by the Co-60 source. Observing the number of surviving mice for 30 days, the survival coefficients for the test groups were calculated and with these the protective coefficients against radiation injury, PCR, were also calculated. The PCR values are 2.24, 2.95, 2.78, and 1.23 for acetylbenzoylaconine, 2-aminoethylisothiouronium bromide hydrobromiide,
-mercaptoethylamine HCI, and L-thiazolidine-4-carboxylic acid respectively. These values reveal that the acetylbenzoylaconine has protective potency against radiation injury on white male mice.
Penumbra Effect on Integral Absorbed Dose in Co-60 Teletherapy
Moon, Philip S. ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 87~93
Due to the Co-60 source size, the penumbra in Co-60 teletheraphy poses a serious problem, even if the extended collimators are used, Here an empirical formula for the calculation of integral absorbed dose in the penumbra region was derived. Through a numerical calculation, the penumbra effect on integral absorbed dose was investigated. The longer the source-to-skin distance, the larger the integral absorbed dose of penumbra region, and the larger the source diameter, the larger the integral absorbed dose of penumbra region. It was also found that in some case the integral absorbed dose in penumbra region becomes several times larger than the integral absorbed dose of treatment region itself if the source-to-skin distance becomes greater. Therefore, one must consider the penumbra effect in Co-60 teletherapy.
Saturation Characteristics of a Boron-lined ionization Chamber
Chae, Sung-Ki ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 94~102
Saturation characteristics of a current-type ionization chamber are investigated theoretically and experimentally in the columnar recombination region. The experiments were performed using a boron-lined cylindrical ionization chamber filled with nitrogen or helium at pressures of 760 mmHg and 380 mmHg. The collection efficiency deduced from the analytical method is in good agreement with the experimental results. This theory makes it possible to predict saturation characteristics for all ionization intensities with only the design data.
Radiation Grafting of Hydrophilic Monomers onto Polyester
Park, Jae-Ho ; Lee, Chong-Kwang ; Lee, Kwang-Jin ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 103~114
Radiation grafting of acrylic acid and 4-vinylpyridine at room temperature has been studied by an impregnation method to improve the hygroscopic properties, the antistatic behavior and the dyeability of polyester fabric. Polyester fabric was impregnated with acrylic acid or aqueous emulsion of acrylic acid-4-vinylpyridine by immersion at 25
. The impregnated fabric was irradiated under nitrogen gas with
-rays from Co-60. When acrylic acid grafted polyester fabric was treated with sodium carbonate, calcium acetate and potassium persulfate, tne rate of water absorption was increased and most parts of polyacrylic acid formed were extracted off from the fabric with 0.1% solution of sodium hydroxide at 10
. In the case of the impregnation of a mixture of acrylic acid and 4-vinylpyridine the petcent of grafting has been shown to be proportional to the ratio of 4-VP/AA and radiation dost. Estimating by contact angle measurements of water on the various polymer surfaces, the antistatic behavior was decreased with the increase of grafting percent. The investigation of electron micrograph disclosed the existence of certain type of discontinuities in the acrylic acid grafted polyester fiber which was treated with various salts.
Critical Mass Minimization of a Cylindrical Geometry Reactor by Two Group Diffusion Equation
Lee, Chang-Kun ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 115~131
L.S. Pontryagin's maximum principle is applied to the minimum critical mass problem without any restriction on the ranges of uranium enrichment. For the analysis, two group diffusion equation is adopted for a cylindrical reactor neglecting the vertical axis consideration. The result shows that the three-zoned reactor turns out to be most optimal: the inner and outer zones with the minimum enrichment ; whereas the middle 3one with the maximum enrichment. With the given three-zoned reactor, critical condition is derived, which leads to the calculation of the determinant. By finding the roots of the determinant the numerical calculation of the minimum critical mass is carried out for the case of Kori reactor geometry changing the minimum or the maximum enrichment. It is found from many computed values that the least possible critical mass turns out to be the case of 1.2% maximum enrichment for the middle zone and 0.65% minimum enrichment for the inner and out zones.
Distributions of Electric Field and Charge Densities in a Plane-Parallel ionization Chamber
Hyun, Kyung-Ho ; Chae, Sung-Ki ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 132~136
Uniformly irradiated parallel-plate ionization chamber filled with a gas free of negative ion-forming contaminants was studied. Computer solutions for the electric field and the positive and negative charge densities at various degrees of saturation were obtained and discussed.
Reactor Neutron Activation Analysis by a Single Comparator Method
Lee, Chul ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 137~149
A method of activation analysis, based on the irradiation and counting of an iron wire which contains manganese impurity as the single comparator. has been elaborated by critical evaluation of nuclear data involved in activation and activity measurement. The variation of effective cross section is investigated as a function of the spectral index and other parameters such as a measure of the proportion of epithermal neutrons in the reactor spectrum. The errors induced by shifts in the neutron spectrum in the irradiation positions are discussed. The known amount of each element is irradiated simultaneously together with the single comparator, and the obtained values are compared with the known amount of each element. The results show that en general the random errors are not greater than those obtained by using the conventional relative method, but the systematic errors were up to about 20%. This method is applied to the determinations of fourteen rare earth elements in monazite as well as other seven elements in the standard kale powder. The satisfactory reproducibility of the present method makes possible the determination of the elements with an accuracy attainable with the conventional relative method.
A Study on the Preparation of Wood-Plastic Combination(I) - General Properties and Radiation Durabilities of Woods
Pyun, Hyung-Chick ; Lee, Kyung-Hee ; Kim, Jaerok ;
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 150~158
General physical properties and radiation durabilities of some domestic woods and imported lauans were measured and discussed as a preliminary study on the preparation of W. P. C. The data obtained indicate that 1) the hardness of wood is generally proportional to the specific gravity and to the bending strength, 2) the hardness of wood measured in tangential direction to the annual ring increases along with the distance from the center of the annual ring to the peel, 3) the changes of specific gravity under 100 Mrad gamma irradiation are not remarkable, 4) the hardnesses of the soft woods are decreased more -readily than those of the hard woods, but the decreases of hardnesses are not extreme upto 10 Mrad sugges ting that the woods are sufficiently durable to gamma irradiation of below 10 Mard in the preparation of W. P. C.
개발도상국에 있어서의 공업연구 (I)
Nuclear Engineering and Technology, volume 5, issue 2, 1973, Pages 159~174