Study of Indoor Radon/ Thoron Concentration with Respect to Construction Types of Dwellings in Mizoram, India

2018 ◽  
Vol 6 (2) ◽  
pp. 44-46
Author(s):  
L.Z. Chhangte ◽  
◽  
P.C. Rohmingliana ◽  
Zirlian ngura ◽  
B.K. Sahoo ◽  
...  
Keyword(s):  
Indoor Radon ◽  
Nationwide Survey ◽  
Survey Result ◽  
Cement Concrete ◽  
Indoor Concentration ◽  
Building Type ◽  
Single Entry ◽  
Crawl Space ◽  
Ventilation Conditions

Indoor radon and thoron concentrations have been measured in the year 2015-2016 using the newly developed pin-hole based radon/thoron discriminating dosimeters with single entry. The measurements have been carried out in fifty dwellings of eight different villages/town situated in Saiha and Lawngtlai District, Mizoram. Dwellings were selected from the building type along with an idea of different ventilation conditions which affects the indoor concentration. Reinforce Cement Concrete (RCC) type of buildings are found to have the highest concentration of indoor radon (100.34 ± 7 Bq/m3) and thoron (41.41 ± 18 Bq/m3) and grounded house are found to have higher concentration compared to that of house with crawl space. However, the concentrations obtained in this work lies in the range covered by nationwide survey result as well as the ICRP regulations.

scholarly journals Radon measurements with CR-39 track detectors at specific locations in Turkey

2004 ◽  
Vol 19 (1) ◽  
pp. 46-49 ◽  
Author(s):  
Asiye Ulug ◽  
Melek Karabulut ◽  
Nilgün Celebi
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Active Faults ◽  
Indoor Radon Concentration ◽  
Arithmetic Means ◽  
Radon Measurements ◽  
New Buildings ◽  
Main Factor ◽  
Ventilation Conditions ◽  
Radon Concentrations

Indoor radon concentration levels at three sites in Turkey were measured using CR-39 solid state nuclear track detectors. The annual mean of radon concentration was estimated on the basis of four quarter measurements at specific locations in Turkey. The measuring sites are on the active faults. The results of radon measurements are based on 280 measurements in doors. The annual arithmetic means of radon concentrations at three sites (Isparta Egirdir, and Yalvac) were found to be 164 Bqm?3, 124 Bqm?3, and 112 Bqm?3 respectively, ranging from 78 Bqm?3 to 279 Bqm?3. The in door radon concentrations were investigated with respect to the ventilation conditions and the age of buildings. The ventilation conditions were determined to be the main factor affecting the in door radon concentrations. The in door radon concentrations in the new buildings were higher than ones found in the old buildings.

Estimation of indoor radon, thoron and their decay products’ concentrations along with annual inhalation dose in dwellings of Punjab, India

2016 ◽  
Vol 27 (3) ◽  
pp. 380-389 ◽  
Author(s):  
Komal Saini ◽  
B. K. Sahoo ◽  
Bikramjit Singh Bajwa
Keyword(s):  
Indoor Radon ◽  
Research Centre ◽  
Reference Level ◽  
Radiological Protection ◽  
Inhalation Dose ◽  
Study Region ◽  
Average Value ◽  
Decay Products ◽  
Single Entry ◽  
Annual Inhalation Dose

In the present study, indoor radon and thoron concentrations were assessed using a newly developed pin hole-based twin cup dosimeter with a single-entry face in some areas of Punjab state, India. The equilibrium equivalent concentrations of radon and thoron were estimated directly by using the newly developed progeny (decay products) sensors designed by Bhabha Atomic Research Centre, Mumbai, India. The average radon and thoron concentrations in the study region were found to be 61.6 ± 18.6 Bq/m3 and 68.0 ± 30.8 Bq/m3, respectively, while the average equilibrium equivalent concentrations of radon and thoron were 25.9 ± 7.7 Bq/m3 and 2.2 ± 0.7 Bq/m3, respectively. Calculated average equilibrium factor for radon and thoron was 0.45 and 0.04, respectively, in the present study. The annual inhalation dose that was calculated from the present observed concentrations varied from 1.1 to 4.1 mSv/year with an average value of 2.4 mSv/year, which is well within the reference level of 10mSv/year recommended by International Commission on Radiological Protection. The study shows that thoron is a significant contributor to the inhalation dose, which is about 29% of the total inhalation dose.

Mapping indoor radon-222 in Denmark: design and test of the statistical model used in the second nationwide survey

2001 ◽  
Vol 272 (1-3) ◽  
pp. 231-241 ◽  
Author(s):  
Claus E. Andersen ◽  
Kaare Ulbak ◽  
Anders Damkjær ◽  
Peter Kirkegaard ◽  
Peter Gravesen
Keyword(s):  
Statistical Model ◽  
Indoor Radon ◽  
Nationwide Survey

scholarly journals Comparison of single and double entry twin cup dosimeter in measuring indoor radon and thoron concentration in Mizoram, India

2018 ◽  
Vol 18 (2) ◽  
pp. 58-63
Author(s):  
L.Z. Chhangte ◽  
P.C. Rohmingliana ◽  
B.K. Sahoo ◽  
B.K. Sapra ◽  
Vanramlawma ◽  
...  
Keyword(s):  
Solid State ◽  
Indoor Radon ◽  
Track Detector ◽  
Nuclear Track Detector ◽  
Single Entry ◽  
Construction Type ◽  
Double Entry ◽  
Seasonal Data

Indoor radon and thoron concentrations have been measured using solid state nuclear track detector (LR-115 type-ІІ) based twin cup dosimeter with single and double entry deployed side by side. The measurements have been carried out in 50 dwellings of 8 different villages/towns situated in Saiha and Lawngtlai districts, Mizoram. Dwellings were selected primarily from the gamma level measured using Micro-R survey meter and the construction type of the building. The average concentrations of radon and thoron were found to be 75.76 Bq/m3 and 96.50 Bq/m3 for single entry dosimeter and 63.47 Bq/m3 and 19.79 Bq/m3 for double entry dosimeter. The single entry dosimeter was found to give more reliable observations than that of double entry in terms of trends of seasonal data and also on the theory behind the manufacturing qualities.

scholarly journals Evaluation of Indoor Radon and It’s Health Risks Parameters within Azuabie, Trans-Amadi and Nkpogu Towns, in Port Harcourt, Rivers State, Nigeria

2021 ◽  
pp. 25-35
Author(s):  
Briggs-Kamara, Margaret Apaemi, Briggs ◽  
Sigalo, Friday Barikpe ◽  
Iyeneomie, Tamunobereton-Ari ◽  
Orlunta, Aloysius Ndubisi
Keyword(s):  
Cancer Risk ◽  
Concentration Level ◽  
Indoor Radon ◽  
Absorbed Dose ◽  
Life Time ◽  
Indoor Concentration ◽  
Port Harcourt ◽  
Sample Points ◽  
Rivers State ◽  
Concentration Levels

Evaluation of indoor radon level and its health risk parameters has been carried out in three communities Azuabie, Trans-Amadi and Nkpogu towns in Port Harcourt, Rivers State, Nigeria. A pocket sized Corentium Arthings digital radon detector meter was used to record the indoor radon concentration levels. The geographical coordinates were recorded using a hand-held geographical positioning system (GPS) for the various sample points. A total of 30 sample points were evaluated, with 10 sample points for each town respectively. The results of the concentration levels showed that for Azuabie (AZ) town, the concentration level varied from 6.660 Bqm-3 to 13.690 Bqm-3 with an average of 10.65±0.95Bqm-3. Nkpogu (NK) town the results of the indoor concentration level ranged from 9.250 Bqm-3 to 18.870 Bqm-3 with an average of 13.32±1.02 Bqm-3, Nkpogu (NK) town, the indoor concentration level ranged from 7.030 Bqm-3 to 20.350 Bqm-3 with an average of 12.25±1.34Bqm-3. The annual absorbed dose for Azuabie, Trans-Amadi and Nkpogu varied as follows, 1.680 mSvy-1 – 3.921 mSvy-1, 2.334 mSvy-1 – 47610 mSvy-1 and 1.774 mSvy-2 – 5.134 mSvy-1 respectively. The annual effect dose rate for the three towns ranged from 0.403 mSvy-1 – 0.941mSvy-1, 0.560 mSvy-1 - 1.143 mSvy-1 and 0.426 mSvy-1 – 1.143mSvy-1. The excess life time cancer risk varied from 1.4117 – 3.294, 1.9607 – 3.999 and 1.4901 – 3.999 respectively. The results of the indoor concentration levels annual and the absorbed dose and the annual effective dose rate are all below the ICRP safe limit. However, the results of the excess life time cancer risk are all higher than the ICRP safe standard limit of 0.029×10-3.

Radon/thoron and progeny levels in dwellings: Regional variations and effect of dwelling characteristics – A case study in Jalandhar district of Punjab, India

2017 ◽  
Vol 27 (5) ◽  
pp. 706-714 ◽  
Author(s):  
Manish Kumar ◽  
Anjali Kaushal ◽  
Amit Sarin ◽  
Rajesh Kumar ◽  
Navjeet Sharma
Keyword(s):  
Indoor Radon ◽  
Geometric Mean ◽  
Mean Value ◽  
Gamma Dose ◽  
Inhalation Dose ◽  
Human Environment ◽  
Single Entry ◽  
Thoron Progeny ◽  
Annual Inhalation Dose

An extensive survey to measure natural radioactivity in human environment in Jalandhar district of Punjab was undertaken. Results of measurements of indoor radon/thoron and their progeny concentrations are being presented here. Single-entry, pin-hole dosemeters were used for the measurement of radon/thoron concentrations. Deposition-based direct radon/thoron progeny sensors were used for measurement of progeny concentrations. The results have been analysed on the basis of regional characteristics, type of construction and building material used. The radon concentration was found to vary from 6.64 ± 1.72 Bq/m3 to 47.18 ± 4.43 Bq/m3 with geometric mean value of 17.9 ± 2.91 Bq/m3 while the thoron concentration varies from 7.75 ± 2.54 Bq/m3 to 82.68 ± 8.33 Bq/m3 with geometric mean value of 33.54 ± 5.09 Bq/m3. The geometric mean value of equilibrium factor for indoor radon and thoron was found to be 0.43 and 0.02, respectively. The estimated annual inhalation dose varies from 0.22 mSv to 1.76 mSv with geometric mean value of 0.66 mSv. Correlation of indoor radon and air gamma dose rate was also studied.

STUDY OF INDOOR RADON, THORON AND THEIR PROGENY IN SOUTH WEST KHASI HILLS DISTRICT OF MEGHALAYA, INDIA

2020 ◽  
Vol 189 (3) ◽  
pp. 347-353
Author(s):  
A Pyngrope ◽  
A Khardewsaw ◽  
Y Sharma ◽  
D Maibam ◽  
A Saxena ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Mean Value ◽  
Study Region ◽  
South West ◽  
Single Entry ◽  
The Mean ◽  
Thoron Progeny

Abstract A survey of indoor radon/thoron and their progeny concentrations was carried out in dwellings in the South West Khasi Hills district of Meghalaya, India. The survey was carried out using solid-state nuclear track detectors based on single-entry pinhole dosimeter and direct radon/thoron progeny sensors. The results are subjected to statistical analysis and discussed in the manuscript. The mean value of annual effective dose of the study region is estimated at 1.8 mSv.y −1. Seasonal variability and role of different indoor parameters are also discussed.

scholarly journals Analysis of Indoor Radon Level and its Health Risks Parameters in Three Selected Towns in Port Harcourt, Rivers State, Nigeria

2021 ◽  
Author(s):  
Orlunta Aloysius Ndubisi ◽  
Margaret Apaem Briggs-Kamara ◽  
Friday Barikpe Sigalo ◽  
Tamunobereton-Ari Iyeneomie
Keyword(s):  
Cancer Risk ◽  
Dose Rate ◽  
Concentration Level ◽  
Indoor Radon ◽  
Absorbed Dose ◽  
Life Time ◽  
Mean Value ◽  
Equivalent Dose ◽  
Equivalent Dose Rate ◽  
Indoor Concentration

Analysis of indoor radon level and its health risk parameters has been carried out in Borikiri (BT), Diobu (DR), and Rebisi (RB) towns in Port Harcourt, Rivers State, Nigeria. A pocket sized Corentium Arthings digital radon detector meter was used to record the indoor radon concentration levels. The geographical coordinates were recorded using a hand-held geographical positioning system (GPS) for the various sample points. A total of ten houses were measured for each town making a total of 30 sample points for the three communities. The results obtained show that for Borikiri town, the concentration level varied from 30.7100 - 19.9800 Bqm-3 with an average of 11.32 ± 2.59 Bqm-3 . The annual absorbed dose varied from 7.7478 - 1.1202 mSv/yr with a mean value of 2.59 ± 0.65 mSv/yr while the annual equivalent dose rate varied from 0.829 - 0.336 mSv/yr with an average of 0.69 ± 0.16 mSv/yr The excess life time cancer risk calculated for seventy years (70yrs) varied from 6.510 - 0.941 with an average of 2.45 ± 1.71. The results of the indoor concentration level for Diobu town ranged from 37.74 - 5.9200 Bqm ?3 with a mean value of 12.95 ± 2.91 Bqm-3 . The annual absorbed dose for the area ranged from 9.5214 - 1.1494 with an average of 3.26 ± 0.73 mSv/yr, the annual equivalent dose rate varied from 0.694-0.359 with a mean of 0.78±0.8, the excess life time cancer risk calculated for seventy years ranged from 8.000-1.725 with a mean of 2.91±0.61. The indoor concentration level for Rebisi town ranged from 12.9500?4.0700 Bqm-3 with an average of 8.55 ± 1.00, the annual absorbed dose ranged from 3.2671 - 1.0268 mSv/yr, the annual equivalent dose rate varied from 0.784 - 0.269 with an average of 0.52 ± 0.06, the excess life time cancer risk of 2.745 - 0.863 with an average of 1.82 ± 0.21. The results of the indoor concentration levels, the annual absorbed dose and the annual effective dose rate are all below the ICRP safe limit. However, the results of the excess life time cancer risk are all higher than the ICRP safe standard limit of 0.029 × 10-3 .

RADON, THORON AND THEIR PROGENY DISTRIBUTION AND ESTIMATION OF ANNUAL EFFECTIVE DOSE AND EXCESS LIFETIME CANCER RISK IN PANATHADY, KASARAGOD DISTRICT, KERALA

2019 ◽  
Vol 188 (1) ◽  
pp. 38-46
Author(s):  
K Nadira Mahamood ◽  
V Prakash
Keyword(s):  
Cancer Risk ◽  
Indoor Radon ◽  
Radiological Protection ◽  
Lifetime Cancer Risk ◽  
Major Health ◽  
Excess Lifetime Cancer Risk ◽  
Activity Concentrations ◽  
Single Entry ◽  
Effective Doses ◽  
Recommended Level

Abstract Radon and thoron are natural radioactive gases that tend to accumulate in the indoor environment and one of their major health implications is the ability to cause lung cancer. Present study comprises the quantification of radon and thoron activity concentrations and measurement of gamma exposure rates in different types of dwellings from the endosulfan-affected area, Panathady, Kasaragod district, Kerala. It is observed that, residents of this area were more prone to various diseases and health problems including cancer. The LR-115 type II solid state nuclear track detectors with single entry pin-hole based dosemeters have been used for the measurement of 222Radon and 220Rn activity concentrations. The assessment of radiological parameters such as annual effective doses and excess lifetime cancer risk has also been done in order to understand the dose level and the associated risk. The estimated values have been compared with the limit recommended by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) and International Commission on Radiological Protection (ICRP). The average indoor radon and thoron activity concentrations observed in these dwellings were 134 ± 30 and 111 ± 28 Bq m−3, respectively. The estimated activity concentrations, effective doses, etc. are found to be within the recommended level by the UNSCEAR or ICRP.

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