scholarly journals Discriminative Measurement of Absorbed Dose Rates in Air from Natural and Artificial Radionuclides in Namie Town, Fukushima Prefecture

2021 ◽  
Vol 18 (3) ◽  
pp. 978
Author(s):  
Koya Ogura ◽  
Masahiro Hosoda ◽  
Yuki Tamakuma ◽  
Takahito Suzuki ◽  
Ryohei Yamada ◽  
...  
Keyword(s):  
Effective Dose ◽  
Annual Effective Dose ◽  
Absorbed Dose ◽  
External Exposure ◽  
Height Distribution ◽  
Artificial Radionuclides ◽  
Fukushima Prefecture ◽  
Dose Rates ◽  
Natural And Artificial Radionuclides ◽  
Absorbed Dose Rates

Ten years have elapsed since the accident at the Fukushima Daiichi Nuclear Power Plant in 2011, and the relative contribution of natural radiation is increasing in Fukushima Prefecture due to the reduced dose of artificial radiation. In order to accurately determine the effective dose of exposure to artificial radiation, it is necessary to evaluate the effective dose of natural as well as artificial components. In this study, we measured the gamma-ray pulse-height distribution over the accessible area of Namie Town, Fukushima Prefecture, and evaluated the annual effective dose of external exposure by distinguishing between natural and artificial radionuclides. The estimated median (range) of absorbed dose rates in air from artificial radionuclides as of 1 April 2020, is 133 (67–511) nGy h−1 in the evacuation order cancellation zone, and 1306 (892–2081) nGy h−1 in the difficult-to-return zone. The median annual effective doses of external exposures from natural and artificial radionuclides were found to be 0.19 and 0.40 mSv in the evacuation order cancellation zone, and 0.25 and 3.9 mSv in the difficult-to-return zone. The latest annual effective dose of external exposure discriminated into natural and artificial radionuclides is expected to be utilized for radiation risk communication.

IMPACT ON ABSORBED DOSE RATE IN AIR IN KANTO REGION BY FUKUSHIMA DAIICHI NUCLEAR POWER PLANT ACCIDENT

2019 ◽  
Vol 184 (3-4) ◽  
pp. 500-503
Author(s):  
K Inoue ◽  
M Arai ◽  
H Tsuruoka ◽  
K Saito ◽  
M Fujisawa ◽  
...  
Keyword(s):  
Dose Rate ◽  
Nuclear Power ◽  
Absorbed Dose ◽  
Ground Level ◽  
Absorbed Dose Rate ◽  
Artificial Radionuclides ◽  
Dose Rates ◽  
The Mean ◽  
Absorbed Dose Rates ◽  
Kanto Region

Abstract Absorbed dose rates in air were measured for the whole area of the Kanto region in 2015, 2016 and 2017 (n = 31 147). The mean absorbed dose rates in air for each prefecture measured by car-borne surveys were from 44 to 67 nGy h−1 (13–289 nGy h−1). The absorbed dose rate in air from artificial radionuclides (134Cs + 137Cs) measured by fixed-point observation (n = 507) was from 1 to 14 nGy h−1 (0–105 nGy h−1), and meaning that the contribution ratios of 134Cs and 137Cs were 3–22%. The deposited location of artificial radionuclides was less than 1000 m from ground level and depended on the topography, wind direction and precipitation field.

Occupational exposure to natural radioactivity in some factories in Suez City

2015 ◽  
Vol 26 (4) ◽  
pp. 567-575
Author(s):  
H. A. Abdel Ghany ◽  
A. El-Shershaby ◽  
A. Sroor ◽  
M. Abdel-Samei
Keyword(s):  
Surface Soil ◽  
Annual Effective Dose ◽  
Absorbed Dose ◽  
Dose Rates ◽  
Activity Concentrations ◽  
Effective Doses ◽  
Average Activity ◽  
Absorbed Dose Rates ◽  
High Resolution Gamma Spectrometry ◽  
Radioactivity Measurements

This work presents the results of the absorbed dose rates and estimated effective doses of the surface soils samples collected from different factories in the industrial region of Suez City, Egypt using high resolution gamma spectrometry system (HpGe) detector. The average activity concentrations of 226Ra, 238U, 232Th and 40K in fertilizer factories were: 74.54 ± 3.7, 26.54 ± 1.3, 14.68 ± 0.73 and 233 ± 11.68 Bq kg−1, respectively, in Ceramic factories were: 75.91 ± 3.7, 31.35 ± 1.56, 20.34 ± 1.01 and 255 ± 12.76 Bq kg−1, respectively, in textile factories were: 121 ± 6.07, 36.22 ± 1.81, 25.80 ± 1.29 and 1076 ± 53.83 Bq kg−1, respectively, in oil factories were: 76.24 ± 3.81, 25.90 ± 1.29, 15.26 ± 0.7 and 266 ± 13.31 Bq kg−1, respectively, and in steel factory were: 79.72 ± 3.98, 35.22 ± 1.76, 11.95 ± 0.59 and 163 ± 8.16 Bq kg−1, respectively. The calculated absorbed dose rates in factories were: 31.13 ± 1.55, 37.86 ± 1.89, 79.04 ± 3.95, 32.64 ± 1.63 and 29.99 ± 1.49 nGy h−1, respectively. Also, the annual effective dose in the above factories were: 0.03 ± 0.001, 0.04 ± 0.002, 0.09 ± 0.004, 0.03 ± 0.001 and 0.036 ± 0.001 mSv y−1, respectively. Also, the exposure of workers to radon was studied using solid state nuclear track detectors (CR-39). The results indicate that feeding materials variably affect the radioactivity measurements of the surface soil in different factories.

scholarly journals Influences of Absorbed Dose Rate on the Mechanical Properties and Fiber–Matrix Interaction of High-Density Polyethylene-Based Carbon Fiber Reinforced Thermoplastic Irradiated by Electron-Beam

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3012
Author(s):  
Se Kye Park ◽  
Dong Yun Choi ◽  
Duyoung Choi ◽  
Dong Yun Lee ◽  
Seung Hwa Yoo
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Carbon Fiber ◽  
Dose Rate ◽  
High Density Polyethylene ◽  
Absorbed Dose ◽  
High Density ◽  
Absorbed Dose Rate ◽  
Dose Rates ◽  
Absorbed Dose Rates

In this study, a high-density polyethylene (HDPE)-based carbon fiber-reinforced thermoplastic (CFRTP) was irradiated by an electron-beam. To assess the absorbed dose rate influence on its mechanical properties, the beam energy and absorbed dose were fixed, while the absorbed dose rates were varied. The tensile strength (TS) and Young’s modulus (YM) were evaluated. The irradiated CFRTP TS increased at absorbed dose rates of up to 6.8 kGy/s and decreased at higher rates. YM showed no meaningful differences. For CFRTPs constituents, the carbon fiber (CF) TS gradually increased, while the HDPE TS decreased slightly as the absorbed dose rates increased. The OH intermolecular bond was strongly developed in irradiated CFRTP at low absorbed dose rates and gradually declined when increasing those rates. X-ray photoelectron spectroscopy analysis revealed that the oxygen content of irradiated CFRTPs decreased with increasing absorbed dose rate due to the shorter irradiation time at higher dose rates. In conclusion, from the TS viewpoint, opposite effects occurred when increasing the absorbed dose rate: a favorable increase in CF TS and adverse decline of attractive hydrogen bonding interactions between HDPE and CF for CFRTPs TS. Therefore, the irradiated CFRTP TS was maximized at an optimum absorbed dose rate of 6.8 kGy/s.

Radiation-induced color centers in LiF for dosimetry at high absorbed dose rates

1980 ◽  
Vol 175 (1) ◽  
pp. 17-18 ◽  
Author(s):  
William L. McLaughlin ◽  
Arne Miller ◽  
Stuart C. Ellis ◽  
Arthur C. Lucas ◽  
Barbara M. Kapsar
Keyword(s):  
Absorbed Dose ◽  
Color Centers ◽  
Dose Rates ◽  
Radiation Induced ◽  
Absorbed Dose Rates

scholarly journals Nanoparticles synthesis by electron beam radiolysis

2014 ◽  
Vol 12 (7) ◽  
pp. 774-781 ◽  
Author(s):  
Ioan Călinescu ◽  
Diana Martin ◽  
Daniel Ighigeanu ◽  
Adina Gavrila ◽  
Adrian Trifan ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Electron Beam ◽  
Chemical Reduction ◽  
Absorbed Dose ◽  
Reduction Process ◽  
High Dose Rate ◽  
High Dose ◽  
Experimental Conditions ◽  
Dose Rates ◽  
Absorbed Dose Rates

AbstractElectron beam (EB) irradiation is a useful method to generate stable silver nanoparticles without the interference of inherent impurities generated from chemical reactions. Our experiments were carried out using linear electron beam accelerators with two different EB absorbed dose rates: 2 kGy min−1 and 7–8 kGy s−1, and with different absorbed dose levels. The optimum conditions for silver nanoparticles (AgNPs) generation by radiolysis, or by radiolysis combined with chemical reduction, were established. In order to obtain a good yield for AgNPs synthesized by radiolysis, a high dose rate is required, resulting in a rapid production process. At low absorbed dose rates, the utilization of a stabilization agent is advisable. By modifying the experimental conditions, the ratio between the chemical and radiolytic reduction process can be adjusted, thus it is possible to obtain nanoparticles with tailored characteristics, depending on the desired application.

Estimation of indoor radon levels and absorbed dose rates in air for Chennai city, Tamilnadu, India

2012 ◽  
Vol 293 (2) ◽  
pp. 649-654 ◽  
Author(s):  
K. S. Babai ◽  
S. Poongothai ◽  
K. S. Lakshmi ◽  
J. Punniyakotti ◽  
V. Meenakshisundaram
Keyword(s):  
Indoor Radon ◽  
Absorbed Dose ◽  
Dose Rates ◽  
Absorbed Dose Rates ◽  
Chennai City

scholarly journals Measurement of radionuclides concentration in soil of selected regions of Kirkuk and Salahuddin

2019 ◽  
Vol 24 (4) ◽  
pp. 62
Author(s):  
Sabah Mahmoud Aman Allah ◽  
Abdullah Zahim Nouri
Keyword(s):  
Effective Dose ◽  
Annual Effective Dose ◽  
Germanium Detector ◽  
Absorbed Dose ◽  
World Health ◽  
Risk Indicator ◽  
Two Samples ◽  
Activity Unit ◽  
External Risk ◽  
Health Organization

The present  research aims to assess the radionuclides concentration in the soil samples by using the spectroscopy technique of high-purity germanium detector. Four samples of soil were collected at depth of 15 cm for selected regions of Kirkuk and Salahuddin governorates with two samples for the two governorates. The study shows that the activity unit for the 226Ra, 214Pb, 212Pb, 228Ac, and 40K in the studied samples ranged between (11.4±0.7-5.6±1.2) in a rate (9.4±0.85) and in a (3.8± 0.4-29±4) and rate (19.3 ± 5.4) (2± 0.1 – 9.4±0.7) in a rate (6.4±0.54) and (1.6±0.2-11.4±1.2) in a rate (7.95 ± 0.775) and (64.2 ± 4.2-226.2 ± 8) in a rate (172.25 ± 7.7) Bq.kg-1, respectively, as well as, calculated EQ Radium (60.7194-12.8314) Bq.kg-1, activity concentration indicator (  (0.4448-0.096133), internal Risk indicator (0.236988-0.049795), external risk indicator(0.164015-0.03466), values of absorbed dose in air (28.79214-6.23074) nGy.kg-1, the annual effective dose internal factor (0.141243-0.030566) mSv.y-1, the annual effective dose external factor(0.035311-0.007641) mSv.y-1. All these values do not exceed the internationally permissible standards recognized by the World Health Organization (WHO) and have no adverse impact, on the human health or the environment.   http://dx.doi.org/10.25130/tjps.24.2019.074

scholarly journals Evaluation of Background Ionizing Radiation Level of Selected Oil Spill Communities of Delta State, Nigeria

2019 ◽  
pp. 1-10
Author(s):  
M. U. Audu ◽  
G. O. Avwiri ◽  
C. P. Ononugbo
Keyword(s):  
Cancer Risk ◽  
Ionizing Radiation ◽  
Effective Dose ◽  
Oil Spill ◽  
Annual Effective Dose ◽  
Absorbed Dose ◽  
Nuclear Radiation ◽  
Lifetime Cancer Risk ◽  
Radiation Level ◽  
Excess Lifetime Cancer Risk

Study of the terrestrial Background Ionizing Radiation levels of selected Oil Spill Communities of Delta State, Nigeria have been carried out using Digilert 200 and Radalert 100 nuclear radiation monitor and a geographical positioning system (Garmin GPSMAP 76S). The exposure rates of the five communities ranges from 0.016 to 0.030  at Jones Creek, 0.014 to 0.034  at Opuwade Community, 0.015 to 0.037   at Okpare community, 0.007 to 0.029  at OtuJeremi community and 0.011to 0.040  at Otor-Edo community. The obtained mean exposures rates were higher than ICRP standard limit of 0.013. The absorbed dose rates calculated ranged from 139.2 to 261 (Jones Creek), 121.8 to 259.8 nGyh-1 (Opuwade Community), 130.5 to 321.9 nGyh-1 (Okpare community), 60.9 to 252.3 nGyh-1 (OtuJeremi community) and 95.9 to 348 nGyh-1 (Otor-Edo community). The estimated annual effective dose equivalent varies from  0.21 to 0.40 , 0.19 to  0.45 , 0.20 to  0.49 , 0.09 to 0.39  and  0.15 to 0.53  for Jones Creek, Opuwade Community, Okpare community, Otu Jeremi community and Otor-Edo community respectively while the excess lifetime cancer risk calculated for Jones Creek varies from (0.75  to 1.40)  x 10-3, Opuwade community (0.65 to 1.59 )×, Okpare community (0.70 to 1.73 ) x , OtuJeremi community (0.33 to 1.35)× and Otor-Edo community (0.51 to 1.87)×. All the mean values of absorbed dose, annual effective dose and excess lifetime cancer risk exceeded their recommended safe values. The results obtained in this work may not constitute any immediate health risk to the residents of the selected oil spill communities but long term exposure in the area may lead to detrimental health risks.

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