scholarly journals Indoor risk assessment of radon gas in the science college buildings-University of Mustansiriyah using RAD-7 detector

2019 ◽  
Vol 13 (27) ◽  
pp. 97-101
Author(s):  
Ali A. Ridha
Keyword(s):  
Annual Effective Dose ◽  
Indoor Radon ◽  
Energy Concentration ◽  
Indoor Radon Concentration ◽  
Average Value ◽  
Science College ◽  
The University ◽  
Short Time ◽  
First Time ◽  
Recommended Action

In the present work, a set of indoor Radon concentration measurements was carried out in a number of rooms and buildings of Science College in the University of Mustansiriyah for the first time in Iraq using RAD-7 detector which is an active method for short time measuring compared with the passive method in solid state nuclear track detectors (SSNTD's). The results show that, the Radon concentrations values vary from 9.85±1.7 Bq.m-3 to 94.21±34.7 Bq.m-3 with an average value 53.64±26 Bq.m-3 which is lower than the recommended action level 200-300 Bq/m3 [ICRP, 2009].The values of the annual effective dose (A.E.D) vary from 0.25 mSv/y to 2.38 mSv/y, with an average value 1.46±0.67 mSv/y which is lower than the recommended the range 3-10 mSv/y [ICRP, 1993]. While the values of lung cancer cases per year per million person vary from 4.50 per million person to 42.84 per million person with an average value 24.35±12 per million person which is lower than the recommended range 170-230 per million person [ICRP, 1993].The values of the potential alpha energy concentration were found to vary from 10.18 mWL to 1.06 mWL, with an average value 5.79±2.8 mWL which is lower than the recommended value of 53.33 mWL given by [UNSCEAR, 1993].

scholarly journals Measurement of indoor radon concentrations in different dwellings in Arar, Saudi Arabia

2018 ◽  
Vol 33 (3) ◽  
pp. 293-300
Author(s):  
Ayman Abdalla ◽  
Samy El-Gamal
Keyword(s):  
Annual Effective Dose ◽  
Indoor Radon ◽  
Geometric Mean ◽  
International Committee ◽  
Geometric Standard Deviation ◽  
Cancer Risks ◽  
Indoor Radon Concentration ◽  
Lifetime Cancer Risk ◽  
Average Value ◽  
Radon Concentrations

Indoor radon concentrations in 33 dwellings in Arar city were measured using a CR-39 detector. This work is the first in the region and was done to assess the health risks. The exposure time was about 4 months, from May to September 2017. It was found that the indoor radon concentration changed in the range from 7.7 to 89.1 Bqm-3 with an overall average of 44.05 ? 6.21 Bqm-3 while the geometric mean is 39.51 Bqm-3 with a geometric standard deviation of 1.67. These values are within the acceptable level set by the International Committee for Radiation Protection. The annual effective dose received by the population of Arar was reported and it varied in the range 0.16 -1.82 mSv with an average value of 0.9 ? 0.16 mSv and the geometric mean is 0.81 mSv. The exposure to radon progeny was studied where the minimum, maximum, average, and geometric mean of exposure are 0.83?10-3, 9.63?10-3, 4.76 ? 0.67? 10-3 and 5.05?10-3 WLM, respectively. Finally, for the estimation of cancer risks, the excess lifetime cancer risk was investigated. Its average value was 3.7?10-3 which is relatively higher.

scholarly journals Measurements of Radon Concentrations and Dose Assessments in Physics Department-Science College-Al-Mustansiriyah University, Baghdad, Iraq

2015 ◽  
Vol 60 ◽  
pp. 83-93 ◽  
Author(s):  
Iman Tarik Al-Alawy ◽  
Haider Rayed Fadhil
Keyword(s):  
Effective Dose ◽  
Building Materials ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Alpha Particles ◽  
Energy Concentration ◽  
Nuclear Track Detector ◽  
Average Value ◽  
Radon Gas ◽  
Physics Department

Measurements of radon gas concentrations with their progeny and the annual effective dose indoor the building of Al-Mustansiriyah University College of Science-Physics Department have been carried out by using time-integrated passive radon dosimeters solid state nuclear track detector CR-39 technique. The detectors with 1cm x1cm have been distributed over 70 places and suspended for sitting (1m) and standing (1.75m) positions in each location under study. The dosimetric measurements are made over a period of 90 days from 30 January 2014 to 30 April 2014. The calibration process has been done using radium-226 source with known activity radiation. It has found that the indoor radon gas concentrations varing from 37.488±6.123Bg/m3 to 58.670±7.660Bg/m3 with an average value 51.398±7.156Bg/m3 at 1m , and varing from 35.964±5.997Bg/m3 to 56.994±7.549Bg/m3 with an average value 47.057±6.847Bg/m3 at 1.75m which are within the worldwide limits 148Bg/m3 (EPA, 2003) and 200-300Bg/m3 (ICRP, 2009). The annual effective dose of the inhalation exposure to radon gas has been estimated and this vary from 0.394mSv/y to 0.617mSv/y with an average value 0.540mSv/y at 1m, and varing from 0.378mSv/y to 0.599mSv/y with an average value 0.495mSv/y at 1.75m which are within the worldwide permissible limist 3-10mSv/y (ICRP, 1993). The potential alpha energy concentration found to vary from 4.053mWL to 6.343mWL with an average value 5.557mWL at 1m and vary from 3.888mWL to 6.162mWL with an average value 5.087mWL at 1.75m which are less than the recommended value 53.33mWL (UNSCEAR, 1993). The lung cancer cases per million person per year vary from 7.093 to 11.101 per million person per year with an average value 9.725 per million person per year at 1m and vary from 6.805 to 10.784 per million person per year with an average value 8.904 per million person per year which are less than the recommended range 170-230 per million person per year (ICRP, 1993). The number of decays per-minute using swabs measurements technique have been used for selected units within two swabs from building materials walls for each unite, with area of 100cm2 using Ludlum 3030, the average of three swabs measurements have been calculated. Hence, the effectiveness of emitted alpha particles from the walls has been calculated to be varied from 0.00000 to 0.02222Bq/cm2 with an average value 0.01169Bq/cm2 at 1m and 0.01015Bq/cm2 at 1.75m respectevily which are within the permissible limit 0.04Bq/cm2 (Danial, 2010).

scholarly journals Measurement of Indoor Radon Gas Concentration in same Region of Baghdad Governorate Using CR-39 Nuclear Track Detector

2017 ◽  
Vol 14 (4) ◽  
pp. 688-691 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Track Detector ◽  
Nuclear Track Detector ◽  
Gas Concentration ◽  
Alpha Emitters ◽  
Average Value ◽  
Radon Gas

In this research the activity of radon gas in air in Baghad governorate,Iraq, using “alpha-emitters track registration (CR-39) track detector were measured. This measurement was done for selected areas from Baghdad Governorate, The results obtained shows that the highest average concentrations for Rn-222 is (179.077 Bq/m^3) which was recorded within Al-Shaaib city and less average concentrations was (15.79 Bq/m^3) in the nearby residential area of Baghdad International Airport and the overall average concentrations is (86.508 Bq/m^3) for these regions. Then the radon concentration was measured annual effective dose calculated from radon concentration and found in range from 0.4031 mSv/y to 4.5179 mSv /y with an average value of 2.1824 mSv/y. The annual effective dose of radon was within the allowed international limits.

The Alpha Particle Doses Received by Students and Staff in Twenty Schools in the North of Hebron Region - Palestine

2021 ◽  
Vol 14 (4) ◽  
pp. 309-316
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Alpha Particles ◽  
Indoor Radon Concentration ◽  
The North ◽  
Cr 39 Detectors ◽  
Average Effective Dose ◽  
Radon Concentrations

Abstract: The aim of the current study was to measure indoor radon concentration levels and its resulting doses received by the students and staff in schools of the directorate of education in the north of Hebron region- Palestine, during the summer months from June to September (2018), using CR-39 detectors. In this study, a total of 567 CR-39-based radon detectors were installed in the selected schools. The average radon concentrations were found to be 90.0, 66.5 and 58.0 Bqm-3 in Halhul, Beit Umar and Alarrub camp schools, respectively. Based on the measured indoor radon data, the overall average effective dose for the studied area was found to be 0.31 mSvy-1. Reported values for radon concentrations and corresponding doses are lower than ICRP recommended limits for workplaces. The results show no significant radiological risk for the pupils and staff in the schools under investigation. Consequently, the health hazards related to radiation are expected to be negligible. Keywords: Radon concentration, Alpha particles, Annual effective dose, Schools. PACs: 29.40.−n.

Indoor Radon and Thoron Concentration and the Associated Effective Dose Rate Determination in Dwellings of Suq Alshouk, Thiqar (Iraq)

2021 ◽  
Vol 19 (12) ◽  
pp. 06-10
Author(s):  
Hussam Najem Abood ◽  
Ahmed Abbas Mohamed
Keyword(s):  
Effective Dose ◽  
Dose Rate ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Type Ii ◽  
Average Value ◽  
Effective Dose Rate

Indoor radon/thoron concentration has been determined in some dwellings of Suq Alshouk district in Thiqar Governorate southern of Iraq, using LR-115 type II and CR-39 (SSNTDs). In this work the indoor radon/thoron concentration varies from (8-73) Bq m-3 for radon with an average 35±2Bq m-3, and ranges (1- 47) Bq m-3 for thoron with an average16±2Bq m-3. The average annual effective dose due to radon and thoron varies from 0.43-3.38m Sv y-1 with average value 1.43±0.11 mSv y-1.

scholarly journals Problems in radon measurements in context of epidemiological studies

2004 ◽  
Vol 12 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Ilia Yarmoshenko ◽  
Ivan Kirdin
Keyword(s):  
Temporal Variation ◽  
Indoor Radon ◽  
Epidemiological Studies ◽  
Radon Progeny ◽  
Indoor Radon Concentration ◽  
Special Investigation ◽  
Equilibrium Factor ◽  
Average Value ◽  
Long Time ◽  
Gas Measurements

Epidemiological case control study is considered to be primary instrument to investigate the relationship between population indoor radon exposure and risk of lung cancer. A number of such studies had been completed in last 15 years and others are running now. Considering indoor radon and progeny some specific efforts should be undertaken to assess the exposure. While the lungs exposure after inhalation arises mainly due to radon progeny, in the case of the radon gas measurements application the researchers have to address the disequilibrium between radon and radon progeny. It is widely accepted by researchers and approved by ICRP that worldwide average value of equilibrium factor is 0.4 though real equilibrium factor value can deviate significantly from average. Temporal variation of indoor radon concentration complicates the evaluation of exposure as well. Three types of variation can be emphasized: diurnal, seasonal and long time. Experimental and modeling investigation of radon entry shown that pattern of indoor radon temporal variation firmly depends on relationship between entry rates of primary radon sources (diffusive and advective) and influencing factors are construction characteristics, climatic condition and life style. To find appropriate parameters describing radon disequilibrium and temporal variation it is necessary to perform special investigation in the representative sample of houses.

Annual effective dose from radon-222 concentration levels in underground water in bungoma south sub - county, Kenya

2021 ◽  
Vol 5 (1) ◽  
pp. 23-26
Author(s):  
Conrad Khisa Wanyama ◽  
George Wangila Butiki ◽  
John Wanjala Makokha ◽  
Fred Wekesa Masinde
Keyword(s):  
Effective Dose ◽  
Water Samples ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Underground Water ◽  
Inhalation Dose ◽  
Average Value ◽  
Dug Wells ◽  
Concentration Levels ◽  
Recommended Action

This research measured the concentration levels of radon in groundwater and determined the ingestion and inhalation dose. The study used RAD7 detector with RAD7-H2O accessory from Durridge Company to determine the radon levels. Thirty water samples in granitic dominated regions were collected from various areas of Bungoma County: ten from boreholes (BH), ten from hand dug wells (WL) and ten from springs (SP). The water samples were collected in 250 ml bottles which were tightly covered with lid to avoid radon leakage. The highest value was 303±4.00 KBq/m3 recorded in Kanduyi well and the lowest was 126±11.4kBq/m3 from where most of the samples recorded a high radon concentration with a mean of 269±5.25 KBq/m3 in wells, 213±7.96 KBq/m3 in boreholes and 290±7.70 KBq/m3 in springs. The average ingestion dose was found to be 1.5±0.07mSv/yr, 1.9±0.09 mSv/yr and 2.1±0.1 mSv/yr. The average annual effective dose rate for the samples collected were 2±0.1 mSv/yr for boreholes, 2.6±0.13 mSv/yr for wells and 2.7±0.14 mSv/yr for springs. The samples reported an average value of AED higher than the world average of 1.15 mSv/yr but below the exception limit of recommended action level of 10 mSv/yr hence the radon concentration levels in underground water in the study area has minimal health implications to the population.

A study of diurnal and short-term variations of indoor radon concentrations at the University of Michigan, USA and their correlations with environmental factors

2016 ◽  
Vol 26 (8) ◽  
pp. 1051-1061 ◽  
Author(s):  
Dong Xie ◽  
Maili Liao ◽  
Hanqing Wang ◽  
Kimberlee J. Kearfott
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Environmental Parameters ◽  
Barometric Pressure ◽  
University Of Michigan ◽  
Outdoor Temperature ◽  
Indoor Radon Concentration ◽  
Hourly Rainfall ◽  
The University ◽  
Radon Concentrations

Measurements of indoor radon concentrations and environmental parameters were collected continuously on an hourly basis over a three-month period (April 2012 to June 2012). These were performed both in a well-ventilated ground floor laboratory and in the unventilated basement directly below it in a two-storey building at the University of Michigan, USA. The diurnal variations of indoor radon concentration were investigated along with their correlations to the environmental parameters. The results showed that in the laboratory with typical air exchange, the highest radon values appeared in the early morning while lower values emerged in the afternoon. A similar time-course was followed by radon concentrations in the basement with stagnant air. The day-average radon concentrations in the laboratory ranged from 27 ± 2 Bq m−3 to 54 ± 5 Bq m−3, with the overall mean of 37 ± 6 Bq m−3 over the three-month data collection period. The overall basement average, 900 ± 92 Bq m−3 is significantly higher than the population-weighted world average value of 39 Bq m−3. For the ground-level laboratory, the indoor humidity, outdoor temperature and indoor–outdoor temperature difference were positively correlated with indoor radon. The indoor radon negatively correlated with outdoor barometric pressure, wind speed and indoor–outdoor barometric pressure differences. However, for the unventilated basement, the only statistically significant correlation of indoor radon concentration was a positive one with hourly rainfall.

scholarly journals Measurements of radon, thoron and their progeny concentrations using twin cup dosimeter for indoor Al-Madaan city – Baghdad – Iraq

2019 ◽  
Vol 14 (30) ◽  
pp. 24-32 ◽  
Author(s):  
Shafik S. Shafik
Keyword(s):  
Lung Cancer ◽  
Effective Dose ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Health Hazard ◽  
Health Hazards ◽  
Radon Progeny ◽  
Average Value ◽  
Activity Concentrations

In this study, the activity concentrations of indoor radon, thoronand their progeny have been measured in air for 61 differentlocations of Al-Maddan city using twin cup dosimeter. Furthermore,some useful parameters concerning the health hazards have beenestimated; working level month (WLM), annual effective dose (Eff),and excess lung cancer per million person per year (ELC).The resultsshow that the values of radon gas levels in the investigated districtsvaried from 56.28 to 194.43Bq/m3with an overall average value132.96Bq/m3, while 0.313 to 1.085 for WLM with an overall average0.740, respectively. The value of Eff and ELC have been found tovary from 1.420 to 4.918 mSv/y with an overall average value3.354mSv/y, and 852 to 2951 with an overall average value 2013,respectively. For thoron gas only, the results showed that the thoronactivity concentration varied from 15.05 to 172.40 Bq/m3 with anoverall average 76.48 Bq/m3, and 0.021to 0.240for WLM with anoverall average 0.106, respectively. The values of Eff and ELC havebeen found to vary from 0.256 to 2.94 mSv/y with an overallaverage1.30 mSv/y and from 57 to 652 with an overall average of298, respectively. The concentration of radon progeny varied from59.44 to 301.39 Bq/m3 with an overall average 157.62 Bq/m3. Theresults illustrated that there is a large variation in the values of themeasured concentrations. This is due to the wide variation in theconstruction of the houses in Al-Madaan city. However, allinvestigated locations have radon concentration below the actionlevel (200-300Bq/m3) that recommended byICRP. Therefore, there isno health hazard of radon in the region of Al-Madaan city wheremeasurements have been performed.

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