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

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 .

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

Asian Journal of Physical and Chemical Sciences ◽

10.9734/ajopacs/2021/v9i230133 ◽

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.

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EVALUATION OF INDOOR/OUTDOOR GAMMA EXPOSURE RATES AND EXCESS LIFE TIME CANCER RISK IN DIFFERENT CITIES OF PAKISTAN

Radiation Protection Dosimetry ◽

10.1093/rpd/ncaa115 ◽

2020 ◽

Vol 190 (4) ◽

pp. 355-363

Author(s):

Jahan Zeb ◽

Mohammad Wasim ◽

Muhammad Awais ◽

Asad Ullah ◽

Talat Iqbal ◽

...

Keyword(s):

Cancer Risk ◽

Dose Rate ◽

Absorbed Dose ◽

Life Time ◽

Absorbed Dose Rate ◽

Detailed Measurement ◽

Dose Rates ◽

The Mean ◽

Azad Kashmir ◽

Indoor And Outdoor

Abstract This study presents a detailed measurement of indoor and outdoor terrestrial gamma radiation levels in different cities of Pakistan. The measurements covered dwellings in 27 cities, covering all provinces and region of Azad Kashmir. Most of the houses were of attached type, made of brick walls and concrete roofs. The measurements were made by a handheld radiation survey meter containing Geiger–Muller tube. The average absorbed dose rate in air was 100 ± 32 nGy h−1 for indoor and 74 ± 30 nGy h−1 for outdoor. The population-weighted mean terrestrial dose rates were 90 nGy h−1 for indoor and 78 nGyh−1 for outdoor. The ratio of indoor to outdoor absorbed dose rate was 1.5 as compared to 1.3 for the world average. The estimated average annual effective dose rate was 0.58 ± 0.18 mSv a−1 and the mean excess life time cancer risk was 2.0 × 10−3.

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INVESTIGATION OF EQUIVALENT DOSE RATE VARIATION IN THE GROUND‐LEVEL AIR BY LITHUANIAN HIGHWAYS

Journal of Environmental Engineering and Landscape Management ◽

10.3846/16486897.2006.9636872 ◽

2006 ◽

Vol 14 (1) ◽

pp. 3-9

Author(s):

Donatas Butkus ◽

Kristina Živilė Gaponovienė

Keyword(s):

Gamma Radiation ◽

Dose Rate ◽

Absorbed Dose ◽

Ground Level ◽

Weighting Factor ◽

Equivalent Dose ◽

Rate Variation ◽

Soil Composition ◽

Equivalent Dose Rate ◽

Ground Level Air

This investigation deals with equivalent dose rate (EDR) of the ground‐level air caused by gamma radiation. Weighting factor for gamma radiation is equal to one, therefore, EDR of the ground‐level air should be similar to the absorbed dose from the ionic radiation dose. In this paper the main parameters which determine the level of equivalent dose rate in the ground‐level air by the Lithuanian highways are defined and analysed. EDR in the ground‐level air by Lithuanian highways was measured and compared to similar average regional values with reference to modeling results evaluating value variation reasons. In the investigation of EDR the ground‐level air was measured in winter and summer. Samples of soil and asphalt were examined with a gamma spectrometer. It was determined that dependence of EDR values in the ground‐level air correlated and depended upon the soil composition, floral or snow cover and distance from an asphalt cover. Cosmic radiation impact on EDR formation is equal at all the locations. Gamma radiation of natural‐origin radionuclides in the soil have the greatest influence on EDR formation in the ground‐level air. The modeling program VISIPLAN was used to define impact of radionuclide radiation from an asphalt cover on EDR formation in a roadside zone. The modeling program InterRAS was used to define EDR formation in the ground‐level air due to gamma radiation of the soil radionuclides.

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