Comparison of the Background Radiation Level within Kanchanpur District, Nepal (original) (raw)
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An Exposure to Natural Background Radiation in Eastern Nepal
Deleted Journal, 2023
Monitoring natural background radiation is important to locate the high background area. The objective of the work is to find the average background radiation in the Morang district and to observe the effects of cosmic radiation at high altitudes. In this study, background radiation was measured in 17 different municipalities of Morang with the help of a GM counter of model GMC-300E plus. The result showed that the annual effective dose of Morang was 0.24±0.02mSv/y and was below the recommended value of 1 mSv/y set by ICRP for public health. The radiation level was slightly higher in the hospital area. The frequency distribution indicates that there is a good fit of observed data with a known Gaussian distribution. The variation of background radiation with an altitude from 381 to 2550m showed an increasing trend. The best-fitted line depicted that background radiation increased by 16% with 1000m in altitude and it was slightly higher than the literature's result of 10-12%. The comparative study of the present work showed that the effective dose was the least value in the Morang (0.24mSv/y) and the highest in the Pokhara Valley (0.81mSv/yr).
Measurement of background radiation in Jhapa, Ilam, Panchthar, and Taplejung districts of Nepal
BIBECHANA, 2023
In this study, we investigated the levels of background radiation in different locations across the Eastern part of Koshi province, specifically in Taplejung, Panchthar, Ilam, and Jhapa. We used a portable Geiger Muller counter to collect data from twenty different locations, with five sites taken from each district. The average absorbed dose rate was found to be 0.243±0.035 mSv/y. The highest measured value of absorbed dose was 0.335±0.041 mSv/y at Pathivara temple in Taplejung, and the lowest was found to be 0.197±0.039 mSv/y at Kakarvita, Jhapa. The results suggest that these four districts do not pose any radiation risk because it was below the threshold of risk (1mSv/y). We also measured the variation of absorption dose with altitude which is positively correlated with altitude with a correlation coefficient of +0.57. This might be because of the surge in cosmic radiation with an increase in altitude.
Annual Effective Dose from Natural Background Radiation in Pokhara, Nepal
Asian Journal of Research and Reviews in Physics, 2020
Measurement of outdoor natural background radiation doses at different locations of Pokhara city, Nepal was carried out using GCA-07W, Nuclear Regulatory Commission (NRC) certified Geiger Muller (GM) detector. From the measurements, the least value of background radiation dose rate was found to be 0.26 ± 0.08 μSv/hr for Mahendra Cave area, and the highest value of dose rate was found to be 0.65 ± 0.12 μSv/hr for Prithvi Narayan Campus. The average annual effective dose rate of Pokhara city was found to be 0.56 ± 0.12 mSv/yr ranging from 0.31 ± 0.09 mSv/yr to 0.80 ± 0.14 mSv/yr. The radiation levels in Pokhara, the most populated city of the western development region of Nepal, were found to be within the secure limit for areas of the normal background recommended by the International Commission on Radiological Protection (ICRP) (1 mSv/yr). Further, the current result was compared with the previous study of annual effective dose rate measured in Kathmandu city. Comparable value of th...
Study of natural background radiation in Kathmandu Valley
BIBECHANA, 2018
The study of natural background radiation dose at thirty two locations of Kathmandu valley has been done successfully using the instrument Radalert 100. The average dose rates and annual effective dose were measured. From the measurements, the least value of average dose rate was found to be (22.3±3.9)×10-3 mR/hr for Sundhara and the greatest value of average dose rate was found to be (37.7±7)×10-3 mR/hr for Budhanilkantha 3. As per the annual effective dose, the least value was 0.391 mSv/yr for Sundhara and the greatest value was 0.661 mSv/yr for Budhanilkantha 3. The average annual effective dose of Kathmandu valley was 0.475 mSv/yr ranging from 0.391 mSv/yr to 0.661 mSv/yr. The values thus obtained were compared to the worldwide average value of annual effective dose, 0.48 mSv/yr. Also, the obtained values were compared to the legal dose limit (annual effective dose), 1 mSv/yr set by International Commission on Radiological Protection (ICRP) for non-radiation workers and members of public. Among these thirty two locations, eight locations were chosen such that they had larger range of the observed dose rates. Those eight locations were re-observed. Further, Chi-square test was carried out to test whether the observed dose rates were following normal distribution or not. From the calculation, it was observed that the observed dose rates were following the normal distribution.
Measurement of natural background radiation level in Darchula district, Nepal
Natural background radiation level within Darchula district of Nepal was measured using a simple portable Geiger-Müller counter. Data were collected along six different directions at different places (three-five places) of the sample sites of the district and was averaged. The average data value with their standard deviation was used for analysis. In this study, the maximum radiation counts of 51.16 2.30 CPM were reported at Satan and the minimum counts of 25.96 2.30 CPM at Gokuleshwar. The observed radiation level of the Darchula district shows that the district is below the radiation risk level (nearly 100 CPM).
Profiles of doses to the population living in the high background radiation areas in Kerala, India
Journal of Environmental Radioactivity, 2004
A sample study of the profiles of radiation exposures to the populations living in the high background radiation areas (HBRAs) of the monazite-bearing region in Kerala, India, has been conducted by monitoring 200 dwellings selected from two villages in this region. Each of these dwellings was monitored for 1 year and the study lasted for a period of 2 years. The indoor gamma ray dose measurements were carried out using thermo luminescent dosimeters (TLDs) and the inhalation doses due to radon, thoron and their progenies were monitored using solid-state nuclear track detector (SSNTD) based twin-cup dosimeters. Outdoor gamma ray dose measurements were carried out using Geiger Muller (GM) tube based survey meters. Annual effective doses were computed, using occupancy factors of 0.8 and 0.2, respectively, for indoor and outdoor, by adding the three components. Occupants of 41.6% of the houses surveyed were observed to receive the annual effective doses ranging between 0.5 and 5 mSv/a, 41.6% between 5 and 10 mSv/a, 10.2% between 10 and 15 mSv/a and 6.6% greater than 15 mSv/a. The inhalation component was generally smaller than the external gamma ray component and on an average it was found to constitute about 30% of the total dose. The paper presents the details of the methodology adopted and the analysis of the results. #
ASSESSMENT OF NATURAL RADIATION DOSE RATES IN AND AROUND UKHRUL TOWN OF MANIPUR, INDIA
The natural background gamma radiation levels were measured in the dwellings of Ukhrul district of Manipur, India using Micro-R survey meter.The measured minimum, maximum and average radiation levels for outdoors were found to be 5.50 ± 0.58, 10.00 ± 0.84 and 7.13 ± 0.77 µR/hrrespectively. Whereas, the measured minimum, maximum and average radiation level for indoors were 5.80 ± 0.84 (Stone wall house with mud floor), 12.20 ± 0.84 (RCC building) and 9.40 ± 0.87 µR/hr respectively. The annual effective dose to the individuals due to the exposure of the natural background gamma radiation levels for Ukhrul district of Manipur based on the present study is estimated to be 0.78 ± 0.08 µGy/year.
Annual background radiation in Chaharmahal and Bakhtiari province
2003
Background: Measurement of background radiation is very important from different points of view especially for human health. The aim of this survey was focused on determining the current background radiation in one of the highest altitude regions (Zagros Mountains), Chaharmahal and Bakhtiari province, in the south west of Iran. Materials and Methods: The outdoors-environmental monitoring exposure rate of radiation was measured in 200 randomly chosen regions using portable Geiger-Muller and Scintillation detectors. Eight measurements were made for each region and an average value was used to calculate the exposure rate from natural background radiation. Results: The exposure dose rate was found to be 28.4 μRh and the annual average effective equivalent dose was found to be 0.49 mSv. An overall population weighted average outdoor dose rate was calculated to be 49 nGyh, which is higher than the world-wide mean value of 44 nGyh and is comparable to the annual effective equivalent dose o...
Current Science
A systematic study of background radiation in southeast Haryana, India, i.e. the Jhajjar, Sonipat and Rohtak districts, was initiated to establish reliable baseline data on the background radiation level of the region. Worldwide many areas have been found with high background gamma radiation, leading to several types of disorders in human beings. So the present study was carried out as a precautionary step. There are two natural sources of ionizing radiation-cosmic and terrestrial. Isotopes of heavy elements and their decay products present in the Earth's crust are the major sources of terrestrial radiation. A radiation survey meter was used for the analysis of gamma radiation. In total, 50 locations were chosen for the survey. Gamma radiation showed variation from 82 to 184 nSv/h, with the mean value of 131.64 ± 5.56 nSv/h. An independent t-test at a significance level of 5% was applied for comparison. Annual effective dose and excess lifetime cancer risk were computed to determine the number of cancer cases due to outdoor radiation.
What did we learn from epidemiological studies in high background radiation area in India
International Congress Series, 2005
Cancer causing potential of chronic exposure to high natural radiation seen in Chavara-Neendakara coast of Karunagappally taluk in Kerala, India is studied by the Natural Background Radiation Cancer Registry, Karunagappally since 1990. Population survey of 359,619 people recorded socio-demographic (SD) information and radiation levels measured inside (71,674) and outside (76,942) houses. Radiation level between and within the panchayats showed large variations. About 23,000 population were exposed to N4 mSv. Cancer pattern and trends were examined in relation to radiation levels. During 1990-2000 lung cancer was the predominant cancer among males (age adjusted rates (AAR) À18.2), followed by esophagus (AAR À6.3). Among females, cancers of the breast (AAR À14.3), cervix (AAR À13.4) and thyroid (AAR À4.3) were the major cancers. Only marginal differences in cancer incidence and its pattern were seen in different areas when broadly classified according to radiation level zones. Increase of incidence of lung cancer with radiation was seen among males but not in females. This needs in-depth studies. Role of confounding and competing risk factors need to be assessed with larger data sets. D 2004 Published by Elsevier B.V.