• Title/Summary/Keyword: $^{60}Co$ r-ray

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The Effect of Lipid Peroxidation of White Ginseng(WG) and Fermented Ginseng(FG) Extracts on the Liver of Mice by R-ray Irradiation (감마선을 조사한 생쥐 간에서 발효인삼이 지질과산화에 미치는 영향)

  • Ko, In-Ho;Yeo, Jin-Dong
    • Journal of the Korean Society of Radiology
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    • v.10 no.4
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    • pp.223-231
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    • 2016
  • The effects of White Ginseng and Fermented Ginseng on liver damage induced by $^{60}Co$ r-ray irradiation were investigated. To one group of ICR male mice were given in White Ginseng(150 mg/kg/day for 7days, orally) before 5Gy(1.01Gy/min) dose of $^{60}Co$ r-ray irradiation. To another group were given in Fermented Ginseng (150 mg/kg/day for 7days, orally)before 5Gy(1.01Gy/min)dose of $^{60}Co$ r-ray irradiation was investigated. Radiation irradiation group were given with saline(0.1 ml) and 5Gy. Contrast group were given with saline(0.1 ml). The levels of $H_2O_2$, catalase and MDA in liver tissue were measured. In Fermented Ginseng (FG+Rad) group and white Ginseng(WG+Rad) group than irradiation group(Rad), the catalase level were significantly increased, and the catalase levels were appeaWhite at radiation protection. It was significantly decreased to MDA and $H_2O_2$ level to Fermented Ginseng (FG+Rad) group and white Ginseng(WG+Rad) group than irradiation group(Rad). Therefore, Fermented Ginseng and white Ginseng were very excellent protector on radiation of liver in mice.

Plastic scintillator beta ray scanner for in-situ discrimination of beta ray and gamma ray radioactivity in soil

  • Bae, Jun Woo;Kim, Hee Reyoung
    • Nuclear Engineering and Technology
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    • v.52 no.6
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    • pp.1259-1265
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    • 2020
  • A beta ray scanner was proposed for in-situ discrimination of beta and gamma ray radioactivity. This scanner is based on the principle that gamma and beta rays experience different changes in detection efficiency in scintillators with different geometries, especially with regard to the scintillator thickness. The ratios of the counting rates of gamma rays (Rgamma), beta rays (Rbeta), and sample measurements (Rtotal) in a thick scintillator to those in a thin one are reported. The parameter Xthick, which represents the counting rate contributed by beta rays to the total counting rate in the thick scintillator, was derived as a function of those ratios. The values of Rgamma and Rbeta for 60Co and 90Sr sources were estimated as 3.2 ± 0.057 and 0.99 ± 0.0049, respectively. The estimated beta ray contributions had relative standard deviations of 2.05-4.96%. The estimated range of the beta rays emitted from 90Sr was 19 mm as per the Monte Carlo N-Particle simulation, and this value was experimentally verified. Homogeneous and surface contaminations of 60Co and 90Sr-90Y were simulated for application of the proposed method. The counting rate contributed by the beta rays was derived and found to be proportional to the concentration of 90Sr-90Y contamination.

A Study on Electrical properties of EPR by Irradiated by X-rays (방사선에 조사된 EPR 의 전기적 특성에 관한 연구)

  • Lee, Sung-Il;Iim, Gui-Yeul;Lee, Ho-Sik;Lee, Hee-Gab
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.11a
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    • pp.565-568
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    • 2002
  • The value of charge current, discharge current, $\varepsilon_r$' $\varepsilon_r"$, residual voltage was measured inorder to investigate electric properties in Ethylene Prophylene Rubber for is irradiated $CO^{60}\gamma$ ray 0-38.1 Mrad. The value of charge current and the discharging current of the EPR is influenced by $CO^{60}-{\gamma}$-irradiation dose The charging current and the discharging current of EPR increase, depending on the ratio of degradation. As the irradiation dose is increased, the peak of residual voltage moves to the slorter time. The properties specific electric constant due to time variation was appeared dispersion by plentiful $CO^{60}-{\gamma}$-irradiation dose. The increase of peak in $\varepsilon_r"$ is attrib uted to the irratiation dose almost proportionally.

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Natural Beryl as a Thermoluminescent Dosimeter

  • Moon, P.S.
    • Nuclear Engineering and Technology
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    • v.6 no.3
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    • pp.151-154
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    • 1974
  • The possibility of using natural beryl thermoluminesence for gamma-ray dose measurement was investigated through the analysis of glow curves obtained with Co-60 gamma-ray irrediation. The natural beryl powder of 80-200 mesh has a good gamma-ray thermoluminescent response and stability at room temperature. The thermoluminescent response is linear from 10mR to 10$^3$R and can be measured up to 10$^{6}$ R.

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Variation in Flowering Time of Soybean after Irradiation

  • E-Hun Kim;Byong-Ho Chang
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.7 no.1
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    • pp.129-132
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    • 1969
  • The polygenic variation in flowering time of soybean irradiated with Co$^{60}$ gamma ray evaluated in the R$_2$ generation. The genetic variance in the irradiation treatment was about four times that of the control. The basic possibility of selection for the early and the late in flowering time of soybean after irradiated with Co$^{60}$ was suggested in this paper.

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Study on irradiation effect by $Co^{60}$ to the carbon resistor (탄소저항체에 대한 $Co^{60}$조사효과에 관한 연구)

  • 지철근;조성욱
    • 전기의세계
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    • v.22 no.4
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    • pp.7-10
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    • 1973
  • The characteristics of all the instruments and materials used in atomic industry is changed due to radiation damages by the effects of radiation activities. In this study, when the Carbon Resistor, main element of electrical circuits, is irradiated by Gamma-Ray, variations in its electrical properties have been investigated. The following results are obtained: 1) The resistance value in Carbon Resistor is exponentially increased as the quantity of irradiation by Gamma-Ray is increased, but in case of more than 10$^{6}$ R/hr. of quantity of irradiation it has saturated-state value. 2) The rate of change inrestistance value has been independent on the intensity of Gamma-Ray source when Carbon Resistor is irradiated in the same quantity of irradiation. 3) The resistance value in irradiated Carbon Resistor has not been varied with elapse of time. 4) The more the distance from the Carbon Resistor to the Gamma-Ray source the more greatly the resistance value is decreased and that it has been shown that the more quantity of irradiation by Gamma-Ray, the greater the rate of decrease in resistance value. Through the above results it has been concluded that the measurement values obtained by the high-precision instruments in the radiation field have to be corrected with proper consideration to radiation damages.

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Development of Radiation Sensor Based on Array SiPM for Measurement of Radioactive Contamination in Effluent (방류수의 방사능 오염 측정을 위한 배열형 SiPM 기반 방사선 검출 센서 제작)

  • Kim, Jeongho;Park, Hyemin;Joo, Koansik
    • Journal of Sensor Science and Technology
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    • v.27 no.4
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    • pp.232-236
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    • 2018
  • A radiation detection sensor was developed and characterized by combining three types of CsI(Tl) scintillators and an array-type SiPM to detect the radioactive contamination of discharged water in real time. The characterization results showed that type 3 exhibited the most desirable characteristics in response linearity (R-square: 0.97889) according to detection sensitivity and incident radiation dose. Furthermore, in terms of spectral characteristics, type 3 exhibited 16.54% at 0.356 MeV (the emission gamma ray energy of $^{133}Ba$), 10.28% at 0.511 MeV (the emission gamma ray energy of $^{22}Na$), 9.68% at 0.356 MeV (the emission gamma ray energy of $^{137}Cs$), and 2.55% and 4.80% at 1.173 MeV and 1.332 MeV (the emission gamma ray energies of $^{60}Co$), respectively. These measurements confirmed the good energy characteristics. The results were used to evaluate the spectral characteristics and energy linearity in a mixed source using type 3 with the best detection characteristics. It was confirmed that the gamma ray peaks of $^{133}Ba$, $^{22}Na$, $^{137}Cs$, and $^{60}Co$ were well resolved. Moreover, it was confirmed that R-square, which is an indicator of energy linearity, was 0.99986. This indicates a good linearity characteristic. Based on this study, further commercialization studies will contribute to measurements in real time and to the management of the contamination caused by radioactive wastewater or radioactive material leakage, which originate from facilities that use radioactive isotopes or care facilities.

Effect of the Co$^{60}$ -Rays due to Electric properties of EPR- (EPR의 전기특성에 미치는 방사선의 영향)

  • 이성일
    • Proceedings of the Safety Management and Science Conference
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    • 2002.11a
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    • pp.253-259
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    • 2002
  • The value of charge currnet, discharge current, ${\varepsilon}r^'$,${\varepsilon}r^{'}$ residual voltage was measured inorder to investigate electric properties in Ethylene Prophylene Rubber for is irradiated C0$^{60}$$\gamma$ ray 0~38.1 Mrad. The value of charge current and the discharging current of the EPR is influenced by C0$^{60}$-$\gamma$- irradiation dose. The charging current and the discharging current of EPR increas, depending on the ratio of degradation. As the irradiatin dose is increased, the peak of residual voltage moves to the slorter time. The properties specific electric constant due to time variation was appeared dispersion by plentiful C0$^{60}$$\gamma$- irradiation dose. The increase of peak in ${\varepsilon}r^{'}$ is attrib uted to the irratiation dose almost proportionally.

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Fabrication and structural observation of amorphous V-Co alloy by mechanical alloying (MA법에 의한 V-Co계 비정질합금의 제조 및 구조분석)

  • Lee, Chung-Hyo
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.22 no.1
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    • pp.51-56
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    • 2012
  • In the present study, we investigated the effect of mechanical alloying (MA) on the formation of amorphous VCo system through solid state reaction during ball milling. Two types of powder samples, ${\sigma}$-VCo intermetallic compound and $V_{50}Co_{50}$ powder mixture, were applied as a starting materials. With increasing milling time, a structural characteristics into the amorphous state is distinctly observed from the structural factor and radial distribution by X-ray diffraction. Amorphization has been observed in all two types of samples after the milling for 120 hrs. DSC spectrum of $V_{50}Co_{50}$ powder sample milled for 60 hrs indicates a sharp exothermic peak from the crystallization at $600^{\circ}C$. The structure factor, S(Q) and radial distribution function, RDF(r), observed by X-ray diffraction gradually change into a structure characteristic of an amorphous state with increasing MA time.

The Experimental Study of the Effective Point of Measurement for Cylindrical Ion Chamber -For Medical Electron Beams- (원통형 전리함의 유효 측정점에 관한 실험적 연구 -의료용 전자선을 중심으로-)

  • 이병용;최은경;장혜숙;홍석민;이명자;전하정
    • Progress in Medical Physics
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    • v.2 no.2
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    • pp.155-160
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    • 1991
  • We have studied the effective point of measurement for cylindrical ion chamber in water phantom for medical electron beams. Markus parallel plate chamber water phantom are used for the measurement of depth dose to determine the depth of the effective point of measurement for various energies(for electron 6MeV, 9MeV, 12MeV, 16MeV, and 20MeV; Co-60; for photon 6MV, 15MV). Cylindrical ion chambes(PTW233643 with r=2.75mm, PR-05P with r=2mm, and PM30 wiht r=15mm are used for the measurement of depth dose by same mtethod and the values of d$\_$50/ and R$\_$p/ obtained by three cylindrical chambers were compared with those of a flat chamber. From this we could evaluate the effective measuring points of cylindrical ion chamber. The effective point of measurement was estimated as 0.4~0.6r shifted toward surface from the center of the chamber for electron beam, 0.3~0.7r for $\^$60/Co X-ray.

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