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

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.

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

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17186776 ◽

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.

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Correlation of the ambient dose equivalent rate and meteorological parameters

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/s10967-020-07278-3 ◽

2020 ◽

Vol 326 (1) ◽

pp. 147-155

Author(s):

Amela Kasić ◽

Amira Kasumović

Keyword(s):

Meteorological Parameters ◽

Dose Equivalent ◽

Equivalent Rate ◽

Ambient Dose Equivalent ◽

Ambient Dose

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

Radiation Protection Dosimetry ◽

10.1093/rpd/ncl029 ◽

2006 ◽

Vol 118 (2) ◽

pp. 182-189 ◽

Cited By ~ 9

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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Ambient dose equivalent rate and soil contamination density with 137Cs in kitchen gardens in settlements of the Bryansk region, Russia in 2020–2021

Radiatsionnaya Gygiena = Radiation Hygiene ◽

10.21514/1998-426x-2021-14-4-85-95 ◽

2021 ◽

Vol 14 (4) ◽

pp. 85-95

Author(s):

V. P. Ramzaev ◽

A. N. Barkovsky ◽

A. A. Bratilova

Keyword(s):

Soil Contamination ◽

Natural Radionuclides ◽

Mean Value ◽

Dose Equivalent ◽

Kitchen Garden ◽

Equivalent Rate ◽

Kitchen Gardens ◽

Ambient Dose Equivalent ◽

Ambient Dose

The article provides results of application of the field (in situ) gamma spectrometry method for carrying out mass monitoring measurements of ambient dose equivalent rate and soil contamination density with 137Cs in kitchen garden plots located in the zone of radioactive contamination after the Chernobyl accident. In 2020 and 2021, 115 private farmsteads in 46 settlements of the Bryansk region were surveyed. At the time of the survey, the officially established average density of soil contamination with 137Cs in the settlements ranged from 27 to 533 kBq/m2 . The field spectra were measured using a portable scintillation gamma-spectrometer-dosimeter. Results of the field measurements and subsequent calculations of soil contamination density with 137Cs in the kitchen gardens were in good agreement with official data on the average soil contamination density with 137Cs in the surveyed settlements. The mean value of the ratio of the experimental data to the official data was 1.04. Individual values of experimental data deviated from corresponding official values by no more than two times. The use of the gamma spectrometry method in situ made it possible: 1) to determine separately values of the ambient dose equivalent rate from 137Cs and from natural radionuclides in the soil, and 2) to estimate the effective external doses to a person who worked in the kitchen gardens. The measured values of ambient dose equivalent rate varied from 17 to 53 nSv/h (mean ± standard deviation = 35 ± 9 nSv/h) for natural radionuclides and from 8 to 432 nSv/h (mean ± standard deviation = 125 ± 91 nSv/h) for 137Cs. The ambient dose equivalent rate from 137Cs normalized to the soil contamination density with 137Cs in the same kitchen garden was in the range of 0.41–0.84 (nSv/h)/(kBq/m2 ) with a mean value of 0.55 (nSv/h)/(kBq/m2 ). If a person stayed in kitchen garden for 840 hours per year, the estimated effective external doses from natural radionuclides and 137Cs were respectively in the range of 0.008–0.025 mSv/year and 0.004–0.20 mSv/year.

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Calculating radiation dose rate from online real-time environmental -spectrum using NaI(Tl) detector

Nuclear Science and Technology ◽

10.53747/jnst.v11i1.128 ◽

2021 ◽

Vol 11 (1) ◽

pp. 16-25

Author(s):

Thu Bac Vuong ◽

Hoang Tuan Truong ◽

Duc Thang Duong ◽

Dac Dung Bui ◽

Duc Viet Cao ◽

...

Keyword(s):

Radiation Dose ◽

Dose Rate ◽

Real Time ◽

Specific Activity ◽

Radioactive Isotopes ◽

Dose Equivalent ◽

Radiation Dose Rate ◽

Equivalent Rate ◽

Ambient Dose Equivalent ◽

Ambient Dose

Calculating gamma radiation dose rate from online real-time environmental gamma spectrum using NaI(Tl) detector has been developed into a software named RADAPROC V.1 in the Center for Operating the National Network of Environmental Radiation Monitoring And Warning (CONNERMAW). Currently, hundreds of online gamma spectra per day from online monitoring stations are processed to calculate the total ambient dose equivalent rate and the ambient dose equivalent rate of typical natural radioactive isotopes such as K-40, Bi-214, Tl-208 according to the method of using the function G(E) and the photo-peak area method. The calculated results have been compared with the results of calculating the dose rate from the specific activity of radioactive isotopes in soil samples collected at the same monitoring location and analyzed in the laboratory. The difference between the methods is less than 25%. The ambient dose equivalent rates of typical natural radioactive isotopes are a bit higher than those calculated with SARA-NMC software. The software will be improved shortly for better results.

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Radiation survey around “the 30th shipyard” company: 30 years after the accident

Hygiene and Sanitation ◽

10.47470/0016-9900-2020-99-7-674-681 ◽

2020 ◽

Vol 99 (7) ◽

pp. 674-681

Author(s):

Alexey V. Titov ◽

Natalia K. Shandala ◽

Dmitry V. Isaev ◽

Natalya Y. Novikova ◽

Vladimir A. Seregin ◽

...

Keyword(s):

Radioactive Waste ◽

Specific Activity ◽

Soluble Form ◽

Dose Equivalent ◽

Equivalent Rate ◽

Ambient Dose Equivalent ◽

Solid Radioactive Waste ◽

60Co Activity ◽

Radioactive Trace ◽

Ambient Dose

Introduction. The objective of this work was the radiation survey in the vicinity of “The 30th Shipyard” Company. The studies were carried out during the period between 2014 and 2016 within the supervision area and in the area of the radioactive trace formed after the accident of 1985 in the nuclear submarine.Material and methods. The following methods were used in the course of the survey: pedestrian gamma surveys, gamma spectrometry measurements of radionuclides using a gamma spectrometer, and radiochemical extraction of 90Sr, followed by measurement of its activity at radiometric installations.Results. Gamma ambient dose equivalent rate within the supervision area beyond the radioactive trace varies within the range between 0.09 and 0.18 µSv/h. The specific activities of 90Sr, 137Cs, and 235U in soil do not exceed 11, 34, and 5.8 Bq/kg, respectively. The specific activity of 60Co in the soil of the Dunay village is lower 0.42 Bq/kg and does not exceed 4.9 Bq/kg at the rest part of the supervision area. The area of the radioactive trace limited by 0.13 µSv/h iso-line does not exceed 0.5 km2, while that limited by 0.3 µSv/h iso-line - 0.0063 km2. Within the area of the trace, the highest value of the gamma dose rate accounts for 0.60 µSv/h. Soils contaminated with emergency radionuclides do not belong to solid radioactive waste. Emergency radionuclides migrated in soil up to 20 cm depth. Today, 137Cs is firmly fixed in the soil. 40-45% of 60Co activity is in acid-soluble form. Under specific conditions, it can migrate deep into the soil and be accessible to plants.Conclusions. Within the supervision area of “The 30th Shipyard” Company, except for the area of the radioactive contamination trace induced by the accident, the radiation situation is the same as that in the area of the Primorskiy Krai. The soil of the radioactive trace does not belong to solid radioactive waste. In the future, the improvement of the radiation situation on the trace will be mainly due to the physical decay of radionuclides.

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