• Title/Summary/Keyword: ionizing energy

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Physiological Characterization of Mono-Cotyledonous Model Plant by Ionizing Irradiation (단자엽 모델 식물의 이온화 에너지원에 따른 생리 활성)

  • Song, Mira;Kim, Sun-Hee;Jang, Duk-Soo;Kang, Si-Yong;Kim, Jin-Baek;Kim, Sang Hoon;Ha, Bo-Keun;Park, Yong Dae;Kim, Dong Sub
    • Journal of Radiation Industry
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    • v.5 no.1
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    • pp.7-13
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    • 2011
  • The present study has been performed to compare the physiological analysis of monocot model plant (rice) in response to ionizing irradiations (cosmic-ray, gamma-ray, and Ion beam). Ionizing radiations were implanted into monocot model plant (rice) seed. After irradiation, the seeds were planted in the plastic pots for a growth period of one month. Thereafter, the morphological and physiological characteristics including malondealdehyde (MDA) and chlorophyll content, activities of antioxidant enzymes in irradiation samples were investigated. We are confirmed that the activity level of MDA and chlorophyll content were not changed by ionizing irradiation samples. However, the free radical contents were increased in all irradiated plants. And the activities of SOD, POD, and APX were significantly increased by irradiation compared with non-irradiation plant.

Browning end Color Characteristics in Mushrooms (Agaricus bisporus) As Influenced by ionizing Energy (버섯의 갈변 및 색도에 대한 전리에너지의 영향)

  • Kwon, Joong-Ho;Byun, Myung-Woo;Cho, Han-Ok
    • Korean Journal of Food Science and Technology
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    • v.22 no.5
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    • pp.509-513
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    • 1990
  • Browning and color characteristics of stored mushrooms (Agaricus bisporus)following ionizing irradiation were investigated in connection with quality deterioration. The phenolic compounds of stored mushrooms showed a gradual decreasing tendency, while extractable browning pigments apparently rose from around 3days of storage under the conditions of $9{\pm}1^{\circ}C,\;80{\pm}7%$ RH and packaging with a corrugated paper box wrapped up in PE. ${\gamma}-irradiation$ at 2 to 3 kGy resulted in a significant reduction of their changes. Immediately after treatment, irradiated mushrooms were more discolored, i.e. a lower Hunter L value and higher Hunter a and b values than control. However, the subsequent storage for 15 days resulted in a preventive influence of ionizing energy on mushroom discoloration. This beneficial effect of ionizing energy was somewhat higher in the pilei than in the stipes of mushrooms and was found to increase lineally with increasing doses up to 3 kGy.

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Genotoxicological Safety Evaluation of Imported Oranges Irradiated with Ionizing Energy (이온화 에너지를 조사한 수입 오렌지의 유전독성학적 안전성 평가)

  • Huang, Yu-Hua;Jung, Da-Woon;Kang, Il-Jun
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.43 no.6
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    • pp.909-915
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    • 2014
  • This study was carried out to evaluate the genotoxicity of imported oranges irradiated with ionizing energy (0.5 and 1 kGy). In bacterial reversion assays with Salmonella Typhimurium TA98, TA100, TA1535, and TA1537, imported oranges irradiated with ionizing energy (0.5 and 1 kGy) showed no significant increase in the number of revertant colonies in both the absence and presence of the S9 metabolic activation system. In chromosomal aberration tests with Chinese hamster ovary (CHO) cells, imported oranges irradiated with ionizing energy (0.5 and 1 kGy) showed no increase in the frequency of chromosomal aberrations. In in vivo mouse micronucleus assay, imported oranges irradiated with ionizing energy (0.5 and 1 kGy) showed no increase in the frequency of polychromatic erythrocytes with micronucleus. These results indicate that imported oranges irradiated with ionizing energy (0.5 and 1 kGy) showed no genotoxic effects under these experimental conditions.

Effect of the Storage Temperature, Duration and Gamma Irradiation on the Respiration Rate and Sugar Content of Minituber 'Superior'

  • Lim, Ji-Hyeok;HwangBo, Jun-Kwon;Baek, Myung-Hwa;Kim, Jin-Hong;Kim, Jae-Sung;Lee, Myung-Chul
    • Korean Journal of Environmental Agriculture
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    • v.24 no.1
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    • pp.61-65
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    • 2005
  • This study was to evaluate whether ionizing gamma radiation could be applied to break the dormancy of a potato minituber. The respiration rate of the minitubers was significantly affected by the storage temperature and a low dose gamma radiation. Ionizing radiation of 8 Gy enhanced the respiration rate of the potato tuber stored at $10^{\circ}C$ for 20 days. The potato tuber subjected to 4 and 8 Gy after 40 days storage at 10 and $20^{\circ}C$ exhibited higher respiration rates compared to the control (non-irradiated), but not at st. However, the ionizing radiation did not exhibit on significant effect on the respiration rate of the potato tuber stored for 60 days. It was observed that minitubers stored for 20 days had significant response to the storage temperature in terms of the total sugar content the higher the storage temperature, the lower the total sugar content. It was measured that the reducing sugar content was increased under the storage conditions both 5 and $10^{\circ}C$ for 40 days, but not to $20^{\circ}C$. The total sugar contents in the minituber stored for 60 days were similar to those stored for 40 days. The data was discussed on the relationships among the storage duration, temperature and ionizing radiation.

Synergistic Effects of Ionizing Radiation and Mercury Chloride on Cell Viability in Fish Hepatoma Cells (이온화 방사선 및 염화수은 처리에 따른 어류 간암세포의 생존능 평가)

  • Han, Min;Hyun, Kyung-Man;Nili, Mohammad;Hwang, In-Young;Kim, Jin-Kyu
    • Korean Journal of Environmental Biology
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    • v.27 no.2
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    • pp.140-145
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    • 2009
  • All organisms are being exposed to harmful factors present in the environmental. The combined action of various factors is a distinguishing feature of modern life. An interaction between two chemicals is considered as synergistic when the effect produced is greater than the sum of the two single responses. The biological effects due to the combined action of ionizing radiation with the other factor are hard to estimate and predict in advance. In the current study, we investigated the synergistic effects between ionizing and $HgCl_2$ using fish hepatoma cells (PLHC-1 cells). The results showed a dramatic decrease of cell viability after simultaneous treatment of PLHC-1 cells with ionizing radiation and $HgCl_2$. Neiither of the two had any cytotoxic effect when treated alone. The cytotoxicity of ionizing radiation was enhanced in the presence of $HgCl_2$. The synergistic effects were observed after exposure of the PLHC-1 cells to ionizing radiation combined with $HgCl_2$. The synergistic interaction was due to an increase of irreversibly damaged cells after the combined exposure. Analysis of the extent of synergistic interaction enables to make quantitative estimation of irreversibly damaged cells after the combined exposure. The present study suggests that PLHC-1 cells can serve as rapid screening tools for detecting the toxicity of harmful factors.

A Proposal on Evaluation Method of Neutron Absorption Performance to Substitute Conventional Neutron Attenuation Test

  • Kim, Jae Hyun;Kim, Song Hyun;Shin, Chang Ho;Choe, Jung Hun;Cho, In-Hak;Park, Hwan Seo;Park, Hyun Seo;Kim, Jung Ho;Kim, Yoon Ho
    • Journal of Radiation Protection and Research
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    • v.41 no.4
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    • pp.384-388
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    • 2016
  • Background: For a verification of newly-developed neutron absorbers, one of guidelines on the qualification and acceptance of neutron absorbers is the neutron attenuation test. However, this approach can cause a problem for the qualifications that it cannot distinguish how the neutron attenuates from materials. Materials and Methods: In this study, an estimation method of neutron absorption performances for materials is proposed to detect both direct penetration and back-scattering neutrons. For the verification of the proposed method, MCNP simulations with the experimental system designed in this study were pursued using the polyethylene, iron, normal glass and the vitrified form. Results and Discussion: The results show that it can easily test neutron absorption ability using single absorber model. Also, from simulation results of single absorber and double absorbers model, it is verified that the proposed method can evaluate not only the direct thermal neutrons passing through materials, but also the scattered neutrons reflected to the materials. Therefore, the neutron absorption performances can be accurately estimated using the proposed method comparing with the conventional neutron attenuation test. Conclusion: It is expected that the proposed method can contribute to increase the reliability of the performance of neutron absorbers.

Sensitivity Analysis of the Structural Characteristics of the MOS Capacitors for Sensing the Ionizing Radiation Effects (전리방사선 센서용 MOS Capacitors의 구조적 변화에 따른 감도 특성 분석)

  • Hwang, Young-Gwan;Lee, Nam-Ho;Lee, Hyun-Jin
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.1181-1182
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    • 2008
  • The study presents the results of the analysis on the structural characteristics of MOS capacitor for sensing the ionizing radiation effect. Increasing the thickness of MOS capacitor's oxide layer enhanced the sensitivity of MOS capacitor under irradiation condition, but the sensitivity of irradiated MOS capacitor is uninfluenced by the area of MOS capacitor.

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The Measurement of National Standard ${\beta}$-Rays Energy Spectrum (기준 베타선장의 에너지 스펙트럼 측정)

  • Kim, Chul-Hang;Yi, Chul-Young;Kim, Hyun-Moon;Hah, Suck-Ho;Jeon, Gook-Jin
    • Progress in Medical Physics
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    • v.23 no.4
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    • pp.285-291
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    • 2012
  • In the present study, we measured the pure beta particle energy spectra of $^{147}Pm$, $^{85}Kr$, $^{90}Sr+^{90}Y$ radionuclide sources. We confirmed the residual maximum energies of KRISS sources meet the requirement of ISO 6980 and calculated mass collision stopping power ratio, which is essential for absolute measurement of absorbed dose from the reference ${\beta}$-rays. The residual maximum energies of KRISS $^{147}Pm$, $^{85}Kr$, $^{90}Sr+^{90}Y$ sources are 0.14, 0.57 and 0.93 MeV, respectively and the mass collision stopping power ratios are 1.123, 1.120 and 1.109, respectively.

CURRENT TRENDS IN IONIZING RADIATION DETECTION

  • Wehe David K.
    • Nuclear Engineering and Technology
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    • v.38 no.4
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    • pp.311-318
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    • 2006
  • Ionizing radiation is a both a natural and man-made phenomena that plays a major role in contemporary applications. The detection of this radiation has evolved over the past several decades from simple observations to precise measurements in space, time, and energy, even in harsh environmental conditions. Tn this paper, we present a snapshot of the current state-of-the-art in radiation measurement technology, highlighting the major applications and detector developments.