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Effect of the duration time of a nuclear accident on radiological health consequences.

Jeong H, Park M, Jeong H, Hwang W, Kim E, Han M - Int J Environ Res Public Health (2014)

Bottom Line: In the case of nuclear accidents, the total emissions of radioactive materials can be classified into several categories.We confirmed that when the duration time of the emissions are prolonged to 7 hours, the concentrations of radioactive substances in the ambient air are reduced by 50% compared to that when the duration time of emission is one hour.Furthermore, it is judged that the proper control of the emission time of a nuclear accident can minimize the health effects on residents.

View Article: PubMed Central - PubMed

Affiliation: Nuclear Environment and Safety Division, Korea Atomic Energy Research Institute, 989-111, Daedeok-daero, Yuseong, Daejeon 305-353, Korea. jeong1208@kaeri.re.kr.

ABSTRACT
This study aimed to quantify the effect of duration time of a nuclear accident on the radiation dose of a densely populated area and the resulting acute health effects. In the case of nuclear accidents, the total emissions of radioactive materials can be classified into several categories. Therefore, the release information is very important for the assessment of risk to the public. We confirmed that when the duration time of the emissions are prolonged to 7 hours, the concentrations of radioactive substances in the ambient air are reduced by 50% compared to that when the duration time of emission is one hour. This means that the risk evaluation using only the first wind direction of an accident is very conservative, so it has to be used as a screening level for the risk assessment. Furthermore, it is judged that the proper control of the emission time of a nuclear accident can minimize the health effects on residents.

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Variations of atmospheric dispersion factors by the duration time of radioactive effluents in the highly populated area.
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ijerph-11-02865-f004: Variations of atmospheric dispersion factors by the duration time of radioactive effluents in the highly populated area.

Mentions: Figure 3 shows the average atmospheric concentration of radioactive substances when the radioactive substances in 1 unit mass (1 Bq/sec) are released in air at a height of 50 m, in order to quantify the atmospheric dispersion characteristics around the Yeoungkwang Nuclear Power plant. As shown in the wind-rose in Figure 1, as the northern and northeastern winds are dominant, there are relatively higher concentrations of radioactive substances distributed in the ambient air in the southern direction of the nuclear power plant site than in the other directions. Figure 4 indicates atmospheric dispersion factors in Hongnong, a densely populated area near the power plant, according to the duration time, to quantify the atmospheric dispersion characteristics of radioactive substances. It was confirmed that as the length of emission duration increases, the 99.5th percentile of atmospheric dispersion factors decreased sharply. It is suspected that as the length of emission duration increases, the changes in wind direction increase as well, which facilitates the dilution of radioactive substances.


Effect of the duration time of a nuclear accident on radiological health consequences.

Jeong H, Park M, Jeong H, Hwang W, Kim E, Han M - Int J Environ Res Public Health (2014)

Variations of atmospheric dispersion factors by the duration time of radioactive effluents in the highly populated area.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3987009&req=5

ijerph-11-02865-f004: Variations of atmospheric dispersion factors by the duration time of radioactive effluents in the highly populated area.
Mentions: Figure 3 shows the average atmospheric concentration of radioactive substances when the radioactive substances in 1 unit mass (1 Bq/sec) are released in air at a height of 50 m, in order to quantify the atmospheric dispersion characteristics around the Yeoungkwang Nuclear Power plant. As shown in the wind-rose in Figure 1, as the northern and northeastern winds are dominant, there are relatively higher concentrations of radioactive substances distributed in the ambient air in the southern direction of the nuclear power plant site than in the other directions. Figure 4 indicates atmospheric dispersion factors in Hongnong, a densely populated area near the power plant, according to the duration time, to quantify the atmospheric dispersion characteristics of radioactive substances. It was confirmed that as the length of emission duration increases, the 99.5th percentile of atmospheric dispersion factors decreased sharply. It is suspected that as the length of emission duration increases, the changes in wind direction increase as well, which facilitates the dilution of radioactive substances.

Bottom Line: In the case of nuclear accidents, the total emissions of radioactive materials can be classified into several categories.We confirmed that when the duration time of the emissions are prolonged to 7 hours, the concentrations of radioactive substances in the ambient air are reduced by 50% compared to that when the duration time of emission is one hour.Furthermore, it is judged that the proper control of the emission time of a nuclear accident can minimize the health effects on residents.

View Article: PubMed Central - PubMed

Affiliation: Nuclear Environment and Safety Division, Korea Atomic Energy Research Institute, 989-111, Daedeok-daero, Yuseong, Daejeon 305-353, Korea. jeong1208@kaeri.re.kr.

ABSTRACT
This study aimed to quantify the effect of duration time of a nuclear accident on the radiation dose of a densely populated area and the resulting acute health effects. In the case of nuclear accidents, the total emissions of radioactive materials can be classified into several categories. Therefore, the release information is very important for the assessment of risk to the public. We confirmed that when the duration time of the emissions are prolonged to 7 hours, the concentrations of radioactive substances in the ambient air are reduced by 50% compared to that when the duration time of emission is one hour. This means that the risk evaluation using only the first wind direction of an accident is very conservative, so it has to be used as a screening level for the risk assessment. Furthermore, it is judged that the proper control of the emission time of a nuclear accident can minimize the health effects on residents.

Show MeSH
Related in: MedlinePlus