• Journal of radiological science and technology
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• v.14 no.2
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• pp.37-44
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• 1991

The combined effect of radiation and ultrasound has been studied in mouse embryos. Radiation and/or ultrasound were adminstered to ICR mice on day 8 of gestation. Intrauterine death, gross malformation, and fetal body weight were selected as indicators of effects. Does of whole-body ${\gamma}-irradiation$ were 0.5 to 2.5 Gy and those of ultrasound were $0.5\;W/cm^2$ to $3\;W/cm^2$. Intrautrine mortality increased with increasing radiation dose ; this trend was more remarkable in combination with ultrasound. Gross malformations such as exencephaly and anophthalmia/microphthalmia appeared frequently in the fetuses treated with both radiation and ultrasound. Decreased fetal weight was observed even in mice treated with 1.5 Gy of radiation or $1\;W/cm^2$ of ultrasound. There was a linear relationship between dose and reduction of fetal weight. The fetal weight was sensitive, precise and easy-to-handle indicator for the effects of growth retardation. Intrauterine mortality and frequencies of exencephaly and anophthalmia/microphthalmia were higher than the sum of those induced by radiation and by ultrasound. The results indicatied that the combined action of radiation and ultrasound on intrauterine death and malformations was synergistic.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.12 no.2
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• pp.21-33
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• 1990

This study was performed to evaluate the effects of preoperative and postoperative radiation on the healing of surgical wound and the relationship between surgery-radiation interaval histopathologically. Experimental animals were 64 rats of Sprague-Dawely strain weighing about 180grams. In postoperative radiation group, a single dose of 1000 rads irradiation was delivered on 1,2,3, weeks after incision and 24 animals were sacrificed on the 1st, 3rd, 7th, and 14th day after radiation. In preoperative radiation group incision was performed on 1,2,3,4 weeks after a single dose of 1000 rads and 32 animals were sacrificed on the 1st, 3rd, 7th, and 14th after incision. Tissue specimens were prepared as usual methods and stained with hematoxyline-eosin for ordinary light microscopy. Histopathologic study revealed the following favorable results : 1. In 2 and 3 weeks radiation group after incision, the healing process was unaffected by radiation. 2. In 1 week radiation group after incision, the healing process was slightly retarded, as compared with 2,3 weeks radiation group after incision. 3. In 1,2 and 3 weeks incision group after radiation, the healing process appeared about 7 days later than that of control group. 4. In 4 weeks incision after radiation, the healing process was unaffected by radiation.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.3
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• pp.422-426
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• 2012

Transient radiation is emitted during a nuclear explosion. Transient radiation causes a fatal error in the CMOS circuit as a Upset and Latch-up. In this paper, transient radiation NMOS, PMOS, INVERTER SPICE model was proposed on the basisi of transient radiation effects analysis using TCAD(Technology Computer Aided Design). Photocurrent generated from the MOSFET internal PN junction was expressed to the current source and Latch-up phenomenon in the INVERTER was expressed to parasitic thyristor for the transient radiation SPICE model. For example, the proposed transient radiation SPICE model was applied to CMOS NAND circuit. SPICE simulated characteristics were similar to the TCAD simulation results. Simulation time was reduced to 120 times compared to TCAD simulation.

• Journal of Radiation Protection and Research
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• v.35 no.4
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• pp.157-162
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• 2010

This study surveyed a total of 1,322 radiation technologist in health care institutions throughout Korea. This is a comparative study conducted on the levels of protective behavior against the harmful effects of radiation in heath care institutions which indicated that university hospitals and general hospitals showed higher level of protective behavior than for medical practitioners. This study found university hospitals have the following 7 characteristics to manage protective behavior against the harmful effects of radiation, protective environment, self-efficacy by distinction of task, self-efficacy, expectation of the protective behavior, the number of patients, level of the education related to the protection of the harmful effects of radiation and protective attitude. While general hospitals have the following 3 characteristics protective environment, expectation of the protective behavior and protective attitude. Hospitals have the following 4 characteristics protective environment, expectation of the protective behavior, protective attitude and self-efficacy. and medical clinics have characteristics protective environment.

• Nuclear Engineering and Technology
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• v.54 no.12
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• pp.4422-4430
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• 2022

Studying the effects of gamma radiation on the instrumentation and control (I&C) system of a nuclear power plant is critical to the successful and reliable operation of the plant. In the accidental scenario, the adverse environment of ionizing radiation affects the performance of the I&C system and it leads to inaccurate and incomprehensible results. This paper reports the effects of gamma radiation on the AT89C51RD2, a commercial-off-the-shelf 8-bit high-performance flash microcontroller. The microcontroller, selected for the device under test for this study is used in the remote terminal unit for a nuclear power plant. The custom circuits were made to test the microcontroller under different gamma doses using a ⁶⁰Co gamma source in both ex-situ and in-situ modes. The device was exposed to a maximum dose of 1.5 kGy. Under this hostile environment, the performance of the microcontroller was studied in terms of device current and voltage changes. It was observed that the microcontroller device can operate up to a total absorbed dose of approximately 0.6 kGy without any failure or degradation in its performance.

• Korean Journal of Veterinary Research
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• v.28 no.2
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• pp.391-396
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• 1988

Appreciable radiation exposures certainly occur in the workers who handle radioiodine in biochemical research, nuclear medicine diagnostics with the development of nuclear industries. But in the case of occurring the nuclear accidents, the early medical treatment of radiation injury should be necessary but little was reported in korea till now. Accordingly, to achieve of the basic data for protective roles and medical treatment of radiation injury, the present studies were carried out to evaluate the decontamination of radioiodine by the administration of the antithyroid drugs. The results observed are summarized as follows: 1. The administration of sodium iodide and potassium iodide results in rapid excretion of radioiodine and reduction of the whole body retention than the saline-only group. 2. Reguarding to thyroid protective effects, sodium iodide, potassium iodide and saline were effected significant in order. 3. In the control(saline) group, if administered with enough fluids, the whole body retention of radioiodine is reduced temporary shifts. But as far as radioprotective effects is concerned, saline was not more in the protective effects than the other groups. In conclusion, in case of nuclear accidents, if being administered sodium iodide and saline as quickly as possible, the radioprotective effects against the radiation hazard might be markedly increased in the internal contamination of radioiodine.

• Journal of Radiation Protection and Research
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• v.25 no.3
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• pp.121-128
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• 2000

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.07a
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• pp.457-460
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• 2004

Many of the physical and chemical properties of polymer materials can be altered by high energy radiation. In the present work the exposure to radiation of low density polyethylene(LDPE) included antioxidants was carried out at various doses up to 600kGy at a dose rate of 5kGy/hr in the presence of air at room temperature. The study of the irradiation effects on the material properties has been make by different methods in an integrated way. The experimental data indicate that the decomposition onset temperature(DOT), the crystallinity and the thermoluminescence(TL) with radiation dose. DOT, crystallinity and TL analysis from irradiated PE samples provides useful data for the characterization of radiation-induced oxidation effects on these samples.

• Proceedings of the Korean Society of Crop Science Conference
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• 2003.10a
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• pp.126-127
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• 2003

• Proceedings of the Korean Society of Crop Science Conference
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• 2003.10a
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• pp.128-129
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• 2003