Annual Inhalation Dose of Indoor Radon and Thoron in Mizoram, India

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.

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

Indoor and Built Environment ◽

10.1177/1420326x16687614 ◽

2017 ◽

Vol 27 (5) ◽

pp. 706-714 ◽

Cited By ~ 2

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.

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Inhalation dose from exposure to radon, thoron and their progeny in indoors around a nuclear power generation facility in Uttar Pradesh, India

Indoor and Built Environment ◽

10.1177/1420326x21990824 ◽

2021 ◽

pp. 1420326X2199082

Author(s):

Mukesh Kumar ◽

Pankaj Kumar ◽

Anshu Agrawal ◽

B. K. Sahoo

Keyword(s):

Nuclear Power ◽

Uttar Pradesh ◽

Inhalation Dose ◽

The Public ◽

Equilibrium Factor ◽

Average Value ◽

Different Seasons ◽

Construction Type ◽

Annual Inhalation Dose ◽

Generation Facility

Radon, thoron and their progeny concentration have been measured in dwellings located within a 90 km2 area around a nuclear power plant using solid-state nuclear track detectors. Time-integrated measurements were carried out on a four-month cycle, making three measurements in each dwelling throughout the year. In total, 145 dwellings were selected for the study. The measured values of gas and their progeny concentrations were used to determine the equilibrium factor for radon and thoron indoors and annual inhalation dose. The average value of the equilibrium factor indoors was found to be 0.44 ± 0.23 for radon and 0.015 ± 0.010 for thoron. The annual inhalation dose for the public living around this plant was found to be 0.97 ± 0.55 mSv. Results were analysed for different seasons and different categories of dwellings for their construction type.

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Simultaneous measurements of indoor radon and thoron and inhalation dose assessment in Douala City, Cameroon

Isotopes in Environmental and Health Studies ◽

10.1080/10256016.2019.1649258 ◽

2019 ◽

Vol 55 (5) ◽

pp. 499-510 ◽

Cited By ~ 6

Author(s):

Takoukam Soh Serge Didier ◽

Saïdou ◽

Shinji Tokonami ◽

Masahiro Hosoda ◽

Takahito Suzuki ◽

...

Keyword(s):

Indoor Radon ◽

Dose Assessment ◽

Inhalation Dose ◽

Simultaneous Measurements

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INDOOR RADON AND THORON IN THE VICINITY OF PROPOSED URANIUM MINING SITE: A CASE STUDY AT DASARLAPALLY VILLAGE, TELANGANA STATE, INDIA

Radiation Protection Dosimetry ◽

10.1093/rpd/ncaa032 ◽

2020 ◽

Vol 189 (2) ◽

pp. 205-212 ◽

Cited By ~ 1

Author(s):

G Suman ◽

K Vinay Kumar Reddy ◽

M Sreenath Reddy ◽

Ch Gopal Reddy ◽

P Yadagiri Reddy

Keyword(s):

Activity Concentration ◽

Indoor Radon ◽

Radiation Risk ◽

Uranium Mining ◽

Average Concentration ◽

Nuclear Radiation ◽

Inhalation Dose ◽

Mining Sites ◽

Different Types ◽

Annual Average Concentration

Abstract Studies are being conducted for the past few decades in and around the uranium mining sites across the globe to identify environmental nuclear radiation risk to the common public. The area near Dasarlapally village was identified for uranium exploration by the AMDER, Hyderabad. The present study was carried out to measure the indoor radon and thoron activity concentrations in the dwellings of Dasarlapally village. For this purpose different types of dwellings were chosen randomly across the village. The measured annual average concentration of radon and thoron in dwellings were found to be 141 ± 42 and 139 ± 77 Bqm−3, respectively, and the calculated annual effective inhalation dose due to radon was determined to be 3.5 mSv. Seasonal variation and diurnal variation of radon and thoron activity concentration were investigated. The variation of radon and thoron activity concentration in different types of dwellings was also studied, and the variation was found to be statistically insignificant. The uncertainty propagated in the effective inhalation dose due to thoron was discussed.

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A comparative study of indoor radon levels and inhalation dose in some areas of Punjab and Haryana, India

Indian Journal of Physics ◽

10.1007/s12648-009-0099-7 ◽

2009 ◽

Vol 83 (8) ◽

pp. 1183-1189 ◽

Cited By ~ 5

Author(s):

B. S. Bajwa ◽

Harmanjit Singh ◽

Joga Singh ◽

Surinder Singh

Keyword(s):

Comparative Study ◽

Indoor Radon ◽

Inhalation Dose

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Variability of radon and thoron concentration with type of dwellings in a hilly area

Indoor and Built Environment ◽

10.1177/1420326x16663811 ◽

2016 ◽

Vol 27 (1) ◽

pp. 96-108 ◽

Cited By ~ 5

Author(s):

R. Sivakumar

Keyword(s):

Effective Dose ◽

General Public ◽

Annual Effective Dose ◽

Indoor Radon ◽

Radiological Protection ◽

Moderate Correlation ◽

Inhalation Dose ◽

Four Seasons ◽

Different Types ◽

Underlying Soil

Indoor radon, thoron and progenies are major contributors to the indoor radiation dose which have been measured by our study for different types of dwellings during four seasons of a year. The indoor radon, thoron and progeny levels observed in the present study found to vary with seasons of a year. The average highest radon, thoron and progeny were observed during winter and the corresponding lowest values were observed during summer. The highest 222Rn, 220Rn and progenies concentrations were observed in mud houses and the lowest values were recorded in wooden houses. A good correlation with a correlation coefficient of 0.85 was observed between indoor 222Rn and concentration of its grandparent 238U in underlying soil. A moderate correlation was found between 220Rn and 232Th concentration in underlying soil. The effective dose received by the general public in the present study due to radon and thoron was estimated as 1.43 and 1.13 mSv y−1, respectively. The 222Rn and 220Rn progenies contribute 0.79 and 0.25 mSv y−1, respectively to the annual effective dose received. The inhalation dose received by the general public of the study area due to these airborne isotopes 3.69 mSv y−1 is less than the action limit of International Commission of Radiological Protection (ICRP) (2009).

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