scholarly journals Indoor Radon Measurements Using Radon Track Detectors and Electret Ionization Chambers in the Bauxite-Bearing Areas of Southern Adamawa, Cameroon

2020 ◽  
Vol 17 (18) ◽  
pp. 6776
Author(s):  
Saïdou ◽  
Oumar Bobbo Modibo ◽  
Ndjana Nkoulou II Joseph Emmanuel ◽  
Olga German ◽  
Kountchou Noube Michaux ◽  
...  
Keyword(s):  
Indoor Radon ◽  
Geometric Mean ◽  
Reference Level ◽  
Dose Equivalent ◽  
Ionization Chambers ◽  
The Public ◽  
Average Value ◽  
Equivalent Rate ◽  
Ambient Dose Equivalent ◽  
Ambient Dose

The current work deals with indoor radon (222Rn) concentrations and ambient dose-equivalent rate measurements in the bauxite-bearing areas of the Adamawa region in Cameroon before mining from 2022. In total, 90 Electret Ionization Chambers (EIC) (commercially, EPERM) and 175 Radon Track Detectors (commercially, RADTRAK2) were used to measure 222Rn concentrations in dwellings of four localities of the above region. A pocket survey meter (RadEye PRD-ER, Thermo Scientific, Waltham, MA, USA) was used for the ambient dose-equivalent rate measurements. These measurements were followed by calculations of annual doses from inhalation and external exposure. 222Rn concentrations were found to vary between 36 ± 8–687 ± 35 Bq m−3 with a geometric mean (GM) of 175 ± 16 Bq m−3 and 43 ± 12–270 ± 40 Bq m−3 with a geometric mean of 101 ± 21 Bq m−3 by using EPERM and RADTRAK, respectively. According to RADTRAK data, 51% of dwellings have radon concentrations above the reference level of 100 Bq m−3 recommended by the World Health Organization (WHO). The ambient dose equivalent rate ranged between 0.04–0.17 µSv h−1 with the average value of 0.08 µSv h−1. The inhalation dose and annual external effective dose to the public were assessed and found to vary between 0.8–5 mSv with an average value of 2 mSv and 0.3–1.8 mSv with an average value of 0.7 mSv, respectively. Most of the average values in terms of concentration and radiation dose were found to be above the corresponding world averages given by the United Nations Scientific Commission on the Effects of Atomic Radiation (UNSCEAR). Even though the current exposure of members of the public to natural radiation is not critical, the situation could change abruptly when mining starts.

Variation of indoor radon concentration and ambient dose equivalent rate in different outdoor and indoor environments

2016 ◽  
Vol 55 (2) ◽  
pp. 171-183 ◽  
Author(s):  
Zdenka Stojanovska ◽  
Blazo Boev ◽  
Zora S. Zunic ◽  
Kremena Ivanova ◽  
Mimoza Ristova ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Indoor Environments ◽  
Dose Equivalent ◽  
Indoor Radon Concentration ◽  
Equivalent Rate ◽  
Ambient Dose Equivalent ◽  
Ambient Dose

scholarly journals Exposures from radon, thoron, and thoron progeny in high background radiation area in Takandeang, Mamuju, Indonesia

Nukleonika ◽  
2020 ◽  
Vol 65 (2) ◽  
pp. 89-94 ◽  
Author(s):  
Miki Arian Saputra ◽  
Eka Djatnika Nugraha ◽  
Tri Purwanti ◽  
Rokhmat Arifianto ◽  
Roza Indra Laksmana ◽  
...  
Keyword(s):  
Background Radiation ◽  
Indoor Radon ◽  
Dose Equivalent ◽  
High Background ◽  
Equivalent Rate ◽  
Ambient Dose Equivalent ◽  
High Background Radiation Area ◽  
Thoron Progeny ◽  
Radiation Area ◽  
Ambient Dose

AbstractThe exposure from radon, thoron, and thoron progeny was measured for 45 dwellings in high background radiation area in Takandeang, Indonesia with ambient dose equivalent rate ranging from 0.34 μSv h−1 to 1.90 μSv h−1. The measurement was taken using passive radon and thoron discriminative detector and thoron progeny detector. This measurement was taken from November 2018 to October 2019, and within one month the detector would be replaced with a new detector. The concentrations of radon, thoron, and thoron progeny were calculated as 42–490 Bq m−3, 20–618 Bq m−3, and 4–40 Bq m−3, respectively. The concentrations for outdoor were 49–435 Bq m−3, 23–457 Bq m−3, and 4–37 Bq m−3, respectively, and the annual effective dose was 9.8–28.6 mSv y−1. Based on the result of Spearman’s correlations analysis between the indoor radon and thoron concentrations and between the indoor thoron progeny and thoron concentrations, we suggest that exposure to thoron cannot be predicted from exposure to radon, and the equilibrium equivalent thoron concentration has a large uncertainty when it is estimated from thoron concentration assuming a single thoron equilibrium factor.

scholarly journals Study of the screening survey using an ambient dose equivalent rate survey meter in criticality accidents

2019 ◽  
Vol 6 (0) ◽  
pp. 152-155
Author(s):  
Katsuya Hoshi ◽  
Norio Tsujimura ◽  
Tadayoshi Yoshida ◽  
Osamu Kurihara ◽  
Eunjoo Kim ◽  
...  
Keyword(s):  
Dose Equivalent ◽  
Equivalent Rate ◽  
Ambient Dose Equivalent ◽  
Criticality Accidents ◽  
Screening Survey ◽  
Ambient Dose

Correction Coefficients for Measuring the Ambient Dose Equivalent Rate of Neutrons

ANRI ◽  
2021 ◽  
Vol 0 (4) ◽  
pp. 32-40
Author(s):  
Alexander Alexeev ◽  
Vladimir Pikalov ◽  
Pavel Alexeev
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Dose Equivalent ◽  
Equivalent Rate ◽  
Ambient Dose Equivalent ◽  
Ambient Dose

Calculations of the response for the most widely used neutron dosimeters at the Russian nuclear power plant (NPP) have been performed. It is shown that in some cases it is necessary to introduce a correction for the measured value of the ambient dose equivalent rate (AEDR). The experimentally tested values of the correction for measuring AEDR in the containment rooms of NPP with VVER-1200 are given.

scholarly journals PROCEDURES TO MEASURE MEAN AMBIENT DOSE EQUIVALENT RATES USING ELECTRET ION CHAMBERS

2020 ◽  
Vol 190 (1) ◽  
pp. 6-21
Author(s):  
F Leontaris ◽  
A Boziari ◽  
A Clouvas ◽  
M Kolovou ◽  
J Guilhot
Keyword(s):  
Gamma Spectrometry ◽  
Voltage Drop ◽  
Field Studies ◽  
Dose Equivalent ◽  
Ionization Chambers ◽  
Ambient Dose Equivalent ◽  
The Mean ◽  
Ion Chambers ◽  
Ambient Dose

Abstract The capabilities of electret ion chambers (EICs) to measure mean ambient dose equivalent rates were investigated by performing both laboratory and field studies of their properties. First, EICs were ‘calibrated’ to measure ambient gamma dose equivalent in the Ionizing Calibration Laboratory of the Greek Atomic Energy Commission. The EICs were irradiated with different gamma photon energies and from different angles. Calibration factors were deduced (electret’s voltage drop due to irradiation in terms of ambient dose equivalent). In the field studies, EICs were installed at eight locations belonging to the Greek Early Warning System Network (which is based on Reuter-Stokes ionization chambers) for three periods, averaging 5 months each. In the same locations, in situ gamma spectrometry measurements were performed with portable germanium detectors. Gamma ambient dose equivalent rates were deduced by the in situ gamma spectrometry measurements and by soil sample analysis. The mean daily electret potential drop (in Volts) was compared with the mean daily ambient dose equivalent, measured with a portable HPGe detector and Reuter-Stokes high-pressure ionization chambers. From these measurements, ‘field’ calibration factors (electret’s voltage drop due to gamma radiation in terms of ambient dose equivalent) were deduced and found in very good agreement with the values deduced in Laboratory. The influence of cosmic radiation and the intrinsic voltage loss when performing long-term environmental gamma measurements with EICs, was estimated.

Aircraft crew radiation workplaces: Comparison of measured and calculated ambient dose equivalent rate data using the EURADOS in-flight radiation data base

2006 ◽  
Vol 118 (2) ◽  
pp. 182-189 ◽  
Author(s):  
Peter Beck ◽  
David Bartlett ◽  
Lennart Lindborg ◽  
Ian McAulay ◽  
Klaus Schnuer ◽  
...  
Keyword(s):  
Data Base ◽  
Rate Data ◽  
Dose Equivalent ◽  
Radiation Data ◽  
Equivalent Rate ◽  
Ambient Dose Equivalent ◽  
Ambient Dose
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