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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Radiation Protection and Research
Journal Basic Information
Journal DOI :
Korean Association for Radiation Protection
Editor in Chief :
Volume & Issues
Volume 27, Issue 3 - Sep 2002
Volume 27, Issue 2 - Jun 2002
Volume 27, Issue 1 - Mar 2002
Selecting the target year
Concentrations in Rice Seeds and Chinese Cabbage after a Nuclear Accident
Choi, Yong-Ho ; Lim, Kwang-Muk ; Hwang, Won-Tae ; Lee, Han-Soo ; Lee, Chang-Woo ;
Journal of Radiation Protection and Research, volume 27, issue 3, 2002, Pages 127~146
A method of more realistically, predicting radionuclide concentrations in crop plants varying with time after a nuclear accident was established to estimate 50 years' concentrations of
in polished rice seeds and Chinese cabbage for unit dry deposition. After non-growing season accidents, concentrations of both nuclides decreased gradually with time and
concentrations were higher than those of
throughout the whole period. Radionuclide concentrations in the 1 st year after growing season accidents were on the whole higher than those after non-growing season accidents by factors of up to 30 for
and up to 1,000 for
. In polished rice seeds, the 50 years-integrated concentration was higher for
after non-growing season accidents, whereas the opposite was true after growing season accidents. In Chinese cabbage. however, it was higher for
after both types of the accident. Generally speaking, the dominant pathway for the integrated concentration after the growing season accident was root uptake for
and direct plant contamination for
. The effect of resuspension was negligible. Based on the predicted results. the direct]on of planning countermeasures was suggested for various accident conditions.
Transmission Dose Estimation Algorithm for in vivo Dosimertry
Yun, Hyong-Geun ; Chie, Eui-Kyu ; Huh, Soon-Nyung ; Lee, Hyoung-Koo ; Woo, Hong-Gyun ; Shin, Kyo-Chul ; Kim, Si-Yong ; Ha, Sung-Whan ;
Journal of Radiation Protection and Research, volume 27, issue 3, 2002, Pages 147~154
Purpose : Measurement of transmission dose is useful for in vivo dosimetry of QA purpose. The objective of this study is to develope an algorithm for estimation of tumor dose using measured transmission dose for open radiation field. Materials and Methods : Transmission dose was measured with various field size (FS), phantom thickness (Tp), and phantom chamber distance (PCD) with a acrylic phantom for 6 MV and 10 MV X-ray. Source to chamber distance (SCD) was set to 150 cm. Measurement was conducted with a 0.6 co Farmer type ion chamber. Using measured data and regression analysis, an algorithm was developed lot estimation of expected reading of transmission dose. Accuracy of the algorithm was tested with flat solid phantom with various settings. Results : The algorithm consisted of quadratic function of log(A/P) (where A/P is area-perimeter ratio) and tertiary function of PCD. The algorithm could estimate dose with very high accuracy for open square field, with errors within
. For elongated radiation field, the errors were limited to
. Conclusion : The developed algorithm can accurately estimate the transmission dose in open radiation fields with various treatment settings.
Assessment of Effective Dose from Diagnostic X-ray Examinations of Adult
Kim, Woo-Ran ; Lee, Choon-Sik ; Lee, Jai-Ki ;
Journal of Radiation Protection and Research, volume 27, issue 3, 2002, Pages 155~164
Methodology to evaluate the effective doses to adults undergoing various diagnostic x-ray examinations were established by Monte Carlo simulation of the x-ray examinations. Anthropomorphic mathematical phantoms, the MIRD5 male phantom and the ORNL female phantom, were used as the target body and x-ray spectra were produced by the x-ray spectrum generation code SPEC78. The computational procedure was validated by comparing the resulting doses to the results of NRPB studies for the same diagnostic procedures. The effective doses as well as the organ doses due to chest, abdomen, head and spine examinations were calculated for x-rays incident from AP, PA, LLAT and RLAT directions. For instance, the effective doses from the most common procedures, chest PA and abdomen AP, were 0.029 mSv and 0.44 mSv, respectively. The fact that the effective dose from PA chest x-ray is far lower than the traditional value of 0.3 mSv(or 30 mrem), which results partly from the advances of technology in diagnostic radiology and partly from the differences in the dose concept employed, emphasizes necessities of intensive assessment of the patient doses in wide ranges of medical exposures. The methodology and tools established in this study can easily be applied to dose assessments for other radiology procedures; dose from CT examinations, dose to the fetus due to examinations of pregnant women, dose from pediatric radiology.
Influence of Radioactive Contamination to Agricultural Products Due to Dry and Wet Deposition Processes During a Nuclear Emergency
Hwang, Won-Tae ; Kim, Eun-Han ; Suh, Kyung-Suk ; Han, Moon-Hee ; Choi, Pong-Ho ; Lee, Chang-Woo ;
Journal of Radiation Protection and Research, volume 27, issue 3, 2002, Pages 165~170
Combined with deposition model onto the ground of radionuclides, the influence of radioactive contamination to agricultural products was analyzed due to wet deposition as well as dry deposition from radioactive air concentration during a nuclear emergency. The previous dynamic food chain model, in which initial input parameter is only radionuclide concentrations on the ground, was improved for the evaluating of radioactive contamination to agricultural products from either radionuclide concentrations in air or radionuclide concentrations on the ground. As the results, in case of deposition onto the ground, wet deposition was more dominant process than thy deposition. While the contamination levels of agricultural products were dependent on the a variety of factors such as radionuclides and rainfall rate. It means that the contamination levels of agricultural products are determined from which is more dominant process between deposition on the ground and interception onto agricultural plants.
Development of Long-Range Atmospheric Dispersion Model against a Nuclear Accident
Suh, Kyung-Suk ; Kim, Eun-Han ; Han, Moon-Hee ;
Journal of Radiation Protection and Research, volume 27, issue 3, 2002, Pages 171~179
The three-dimensional long-range dispersion model has been developed to understand the characteristics of the transport and diffusion of radioactive materials released into atmosphere. The model is designed to compute air concentration and ground deposition at distances up to some thousands of kilometers from the source point in horizontal direction. The vertical turbulent motion is considered separately within the mixing layer and above the mixing layer. The test simulation was performed In the area of Northeast Asia. The release point was assumed in the east part of China. The calculated concentration distributions art mainly advected toward the southeast part of release point by the wind fields. The developed model will be used to estimate the radiological consequences against a nuclear accident. The model will be supplemented by the comparative study using the data of the long-range field experiments.
Protective Effects of Paeonia japonica against Radiation-induced Damage
Oh, Heon ; Park, Hae-Ran ; Jeong, Ill-Yun ; Kim, Sung-Ho ; Jo, Sung-Kee ;
Journal of Radiation Protection and Research, volume 27, issue 3, 2002, Pages 181~188
We investigated the effect of Paeonia japonica (PJ) on radiation-induced oxidative damage to macromolecules in vitro and in vivo. The PJ reduced the tail moment (TM) which was a marker of DNA strand break in single-cell gel electrophoresis (SCGE; comet assay) in the human peripheral blood lymphocytes. Lipid peroxidation in the liver of the ICR mouse, measured as malondialdehyde (MDA), was also reduced by PJ administration. Ethanol fraction of PJ was more effective than polysaccharide fraction of that on reduction of TM in SCGE and lipid peroxidation. Also, Their activities to scavenge DPPH radicals and hydroxyl radicals were observed in vitro, and the activities were due to its ethanol fraction. It is plausible that scavenging of flee radicals by PJ extract may have played an important role in providing the protection against the radiation-induced damage. These results indicated that Paeonia japonica might be a useful radioprotector, especially since it is a relatively nontoxic natural product.
Prediction of Evacuation Time for Emergency Planning Zone of Uljin Nuclear Site
Jeon, In-Young ; Lee, Jai-Ki ;
Journal of Radiation Protection and Research, volume 27, issue 3, 2002, Pages 189~198
The time for evacuation of residents in emergency planning zone(EPZ) of Uljin nuclear site in case of a radiological emergency was estimated with traffic analysis. Evacuees were classified into 4 groups by considering population density, local jurisdictions, and whether they ate residents or transients. The survey to investigate the behavioral characteristics of the residents was made for 200 households and included a hypothetical scenario explaining the accident situation and questions such as dwelling place, time demand for evacuation preparation transportation means for evacuation, sheltering place, and evacuation direction. The microscopic traffic simulation model, CORSIM, was used to simulate the behavior of evacuating vehicles on networks. The results showed that the evacuation time required for total vehicles to move out from EPZ took longer in the daytime than at night in spite that the delay times at intersections were longer at night than in the daytime. This was analyzed due to the differences of the trip generation time distribution. To validate whether the CORSIM model fan appropriately simulate the congested traffic phenomena assumable in case of emergency, a benchmark study was conducted at an intersection without an actuated traffic signal near Uljin site during the traffic peak-time in the morning. This study indicated that the predicted output by the CORSIM model was in good agreement with the observed data. satisfying the purpose of this study.