Estimates of the dose of radon and its progeny inhaled inside buildings

Ravikumar, P.; Somashekar, R.K.

doi:10.14712/23361964.2015.10

Cited by 12 publications

(10 citation statements)

References 30 publications

(26 reference statements)

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“…The mean radon concentration for each location in the region was used to calculate the annual effective dose equivalent in homes. For calculation, the occupancy time of 7000 hy -1 , equilibrium factor of 0.4 and dose conversion factor of 9x10 -6 mSvh -1 /Bqm -3 was used to convert radon concentration to population effective dose using equation (1) [6,7,8].…”

Section: Annual Effective Dosementioning

confidence: 99%

Estimation of Indoor Radon and Its Progeny in Dwellings of Akoko Region, Ondo State, Southwestern Nigeria

Ajayi

2017

JSRR

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Radon gas is by far the most important source of ionizing radiation among those that are of natural origin. In this study, radon was measured in some homes built of different types of building materials in Akoko region of Ondo state, Nigeria. The test was conducted using Accustar alpha track long term passive test devices containing CR-39 solid state nuclear track detector foil. The detectors were exposed for a period of six months. After removal the detectors were subsequently etched electrochemically and counted with computer aided image analysis system. The results show that radon concentration varies between 15.00 Bqm-3 to 141.00 Bqm-3 with a mean of 35.54 Bqm-3 and geometric mean of 29.95 Bqm-3. Annual exposure varied between 0.10 WLM to 0.17 WLM with a mean of 0.13 WLM, annual effective dose varied between 0.38 mSvy-1 to 0.69 mSvy-1 with a mean of 0.50 mSvy-1 and lifetime fatality risk varied between 0.50x10-4 to 0.85x10-4 with a mean of 0.64x10-4 in bedroom, living room, store and lobby. This study shows that the local soil origin greatly contributes to radon concentrations recorded in these areas.

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Section: Annual Effective Dosementioning

confidence: 99%

Estimation of Indoor Radon and Its Progeny in Dwellings of Akoko Region, Ondo State, Southwestern Nigeria

Ajayi

2017

JSRR

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“…The methods used to assess the effective dose and excess cancer risk were from previous studies. [34][35][36][37][38][39] The effective dose and the excess risk of lung cancer were derived from survey results and annual radon concentration measurements. Effective dose was calculated using criteria described in the UNSCEAR report.…”

Section: Analysis Methods Of Risk Levelsmentioning

confidence: 99%

Estimation of health risk and effective dose based on measured radon levels in Korean homes and a qualitative assessment for residents’ radon awareness

Lee

Yang

Kim

et al. 2016

Indoor and Built Environment

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More than 50% of the worldwide effective radiation dose from natural sources is known to be due to 222 Rn. Indoor radon levels were measured in homes with long-term exposure and in relation to time spent for residents. Measurements were conducted after categorizing homes by type, and the results (mean AE S.D) showed that detached houses, apartments and multifamily houses had radon concentrations of 97 AE 110, 51 AE 24 and 59 AE 34 Bq/m 3 , respectively. Surveys were conducted with 620 people to analyse resident awareness of radon levels and time that residents spend in homes. Using these results, the annual effective dose and risk level were computed. The survey showed that residents of Korean homes had little awareness regarding the source of radon, exposure routes and contamination levels. The excess risk of lung cancer after exposure for 70 years was determined to be 0.55/100 people, which jumped to 2.7/100 people for residents in detached houses in highly exposed areas. Compared to the effects of radon exposure in workplaces and schools, the health risks from radon in Korean homes are especially high. Therefore, the management policies for susceptible groups are important.

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“…Radon is a gas, so it can be exhaled immediately after being inhaled, but radon decay products that attach themselves to other molecules in the air and other solid particles in the air such as dust, aerosols, and cigarette particles can be deposited on the walls of different regions of the lung. The deposited radon progeny emits ionizing radiation in the form of alpha particles, which can damage bronchial epithelial cells in the lung that could cause cancer [ 5 ]. The risk of lung cancer becomes more dangerous if the person under radon exposure is a smoker.…”

Section: Health Effects Of Radonmentioning

confidence: 99%

“…Radon is among the leading contributors to ionizing radiation and it has been identified as a health hazard for mankind. It is the most leading source of the background radiation dose (55%) received by the environment [ 4 , 5 ], and it is found in variable concentrations from location to location and even from season to season.…”

Section: Introductionmentioning

confidence: 99%

General Overview of Radon Studies in Health Hazard Perspectives

Belete

Anteneh

2021

Journal of Oncology

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The adverse human health effects due to ionizing radiation are well known. Radon is the major source of background radiation among those that are of natural origin. It contributes about 55% of the natural radiation dose to humans. It is a colorless, odorless, and tasteless radioactive noble gas that comes from the natural radioactive decay series of uranium. Radon can be found everywhere in the atmosphere and become attached to aerosols in the air. The aerosols carrying radon and its progeny can be inhaled and deposited in different regions of the human respiratory tract. The deposited radioactive aerosols continue to decay and exposing the lung to ionizing radiation can destroy sensitive cells in the lung, causing a mutation that turns to be cancerous. Different countries and international and national organizations put their action levels to reduce radon lung cancer risk. The Environmental Protection Agency recommends 148 Bq/m3 as the action level. On the other hand, International Commission for Radiation Protection (ICRP) recommends 200 Bq/m3 as the action level. The main objective of this review is to focus on how radon is established as a health hazard, ways of radon detection and measurements, methods of reducing and controlling high indoor radon concentration, and what are the recommended international action levels of radon concentrations. It mainly focuses on the health perspective of radon studies because it is now a crucial and hot issue in the world. In most developing countries like our country Ethiopia, radon studies are not well investigated.

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Estimates of the dose of radon and its progeny inhaled inside buildings

Cited by 12 publications

References 30 publications

Estimation of Indoor Radon and Its Progeny in Dwellings of Akoko Region, Ondo State, Southwestern Nigeria

Estimation of Indoor Radon and Its Progeny in Dwellings of Akoko Region, Ondo State, Southwestern Nigeria

Estimation of health risk and effective dose based on measured radon levels in Korean homes and a qualitative assessment for residents’ radon awareness

General Overview of Radon Studies in Health Hazard Perspectives

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