ASSESSMENT OF RADIATION EXPOSURE LEVEL IN BLACKSMITHING WORKSHOP IN GOMBE, GOMBE STATE

Measurement of terrestrial background ionizing radiation of blacksmith workshops of Gombe State, Nigeria was carried out using well-calibrated Geiger-Muller counter meters and a meter tape. The measured average exposure rate of two line-sections are 0.018±0.002 and 0.017±0.002 mRh-1. Estimated equivalent dose rates for the two line-sections are 1.50 and 1.45 mSvy-1. The average absorbed dose rates estimated in line-section one and line-section two are 154.94 and 149.97 nGyh-1 respectively. Annual effective dose equivalent (AEDE) of 0.48 mSvy-1 was obtained for outdoor exposure in line-section one while in line-section two, AEDE was 0.23 mSvy-1. The calculated mean excess lifetime cancer risk values for the blacksmith workshop sections are 0.83x 10-3 and 0.80 x 10-3. The obtained values for background ionizing radiation in the line-sections of blacksmith workshop were above the recommended standard limit by ICRP while the absorbed doses (D) were above the recommended value and AEDE calculated in two line-sections of blacksmithing workshops were within the safe values this implies that blacksmithing activities in these areas may not influence the doses received by public. The excess lifetime cancer risk (ELCR) estimated were higher than their world permissible values of 0.29 x 10-3 respectively. The calculated dose to organs showed that the testes have the highest organ dose of 0.153 mSvy-1while liver has the lowest organ dose of 0.086 mSvy-1. This result shows that exposure to

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

Current Journal of Applied Science and Technology ◽

10.9734/cjast/2019/v38i330362 ◽

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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Radiation Organ Doses and Excess Lifetime Cancer Risk Due to Exposure to Gamma Radiation from Two Cement Industries in Nigeria

Journal of Scientific Research and Reports ◽

10.9734/jsrr/2019/v25i1-230178 ◽

2019 ◽

pp. 1-12

Author(s):

M. Onwuka ◽

C. P. Ononugbo ◽

G. O. Avwiri

Keyword(s):

Cancer Risk ◽

Organ Dose ◽

Cement Industry ◽

Nuclear Radiation ◽

Gis Mapping ◽

Exposure Rate ◽

Lifetime Cancer Risk ◽

Organ Doses ◽

Excess Lifetime Cancer Risk ◽

The Mean

A study of background ionizing radiation (BIR) levels to estimate organ dose rates and excess lifetime cancer risk in Unicem cement producing company, Calabar, Cross River state and Bua cement producing company, Okpella in Edo state have been carried out using Digilert 100 and Radalert-200 nuclear radiation monitor and a geographical positioning system (GPS) for GIS mapping of the area. The in-situ measurement of the exposure rate was between May, 2018 and June, 2019 at regular intervals. The average exposure rate of 0.023 mRh-1 was measured at Unicem, Calabar and 0.027 mRh-1 at Bua cement area, Okpella. The mean equivalent doses of 1.92 mSvy-1 and 2.29 mSvy-1 was recorded in Unicem and Bua Okpella respectively. The estimated mean outdoor absorbed dose rate value of 196.74 nGyh-1 in Unicem and its environment while in Bua cement industry, Okpella, the value of 234.9 nGyh-1 was obtained. The mean annual effective dose calculated was 0.24 and 0.29 mSvy-1 for Unicem and Bua Okpella respectively. The mean excess life time cancer risk recorded in the areas 0.72 x10-3 in Unicem area and 1.01 x10-3 in Bua cement environment. The calculated dose to organs showed that the testes have the highest organ dose of 0.74 mSvy-1 and 0.83 mSvy-1 for Unicem and Bua Okpella areas respectively while the liver has the lowest organ dose of 0.08 mSvy-1 and 0.11 mSvy-1 for Unicem and Bua Okpella respectively. This study revealed that the exposure rate and all the radiological risk parameters exceeded their recommended safe values. The area of study is radiologically polluted and may be detrimental to human health for long term exposure.

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Assessment of Background Radiation, Annual Effective Dose and Excess Lifetime Cancer Risk in Gonabad City

Frontiers in Biomedical Technologies ◽

10.18502/fbt.v8i3.7111 ◽

2021 ◽

Author(s):

Hamed Masoumi ◽

Mohammad Keshtkar

Keyword(s):

Cancer Risk ◽

Effective Dose ◽

Dose Rate ◽

Background Radiation ◽

Annual Effective Dose ◽

Lifetime Cancer Risk ◽

Indoor Space ◽

Dose Rates ◽

Excess Lifetime Cancer Risk ◽

Background Gamma Radiation

Purpose: Humans are always exposed to ionizing radiation from their environment, which can have destructive effects. This study aimed to measure background gamma radiation and estimate annual effective dose and excess cancer risk in Gonabad city. Materials and Methods: The dose rate due to indoor and outdoor background radiation was measured by RDS-30 radiation survey meter at five zones on the map, including North, South, East, West, and center. Then, the annual effective dose and excess lifetime cancer risk were calculated by associated equations. Results: Mean dose rates for outdoor and indoor spaces were 0.111 µSv/h and 0.139 µSv/h, respectively. The mean background dose rate of indoor space was significantly higher than that of outdoor space. Annual effective dose and excess lifetime cancer risk were obtained as 0.817 and 2.85×10-3, respectively. Conclusion: Background radiation dose, annual effective dose, and cancer risk for Gonabad city were higher than global ones. Further investigations are needed to encompass internal background radiation doses in annual effective dose.

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