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Radon exposure in kindergartens in one Bulgarian district Cover

Radon exposure in kindergartens in one Bulgarian district

Nukleonika
Volume 68 (2023): Issue 2 (June 2023)
By: Antoaneta Angelova,  Nina Chobanova,  Bistra Kunovska,  Desislava Djunakova,  Kremena Ivanova and  Zdenka Stojanovska  
Open Access
|Apr 2023

Figures & Tables

Fig. 1.

Map of Montana district.
Map of Montana district.

Fig. 2.

The effective dose for children and workers is estimated for four months by kindergarten-wise presentation.
The effective dose for children and workers is estimated for four months by kindergarten-wise presentation.

Fig. 3.

The plots of CRn according to the: (a) presence of central heating system, (b) presence of common ventilation system, (c) presence of thermal external walls insulation, and (d) presence of central sewerage system.
The plots of CRn according to the: (a) presence of central heating system, (b) presence of common ventilation system, (c) presence of thermal external walls insulation, and (d) presence of central sewerage system.

Descriptive statistics of indoor radon concentration by the common ventilation system, central heating system, thermal external walls insulation, and central sewerage system

Statistic parameterCommon ventilation systemCentral heating systemThermal external walls insulationCentral sewerage system
YesNoYesNoYesNoYesNo
Number  87    515    445  157    282  320  474  128
Median  60      91      87    69    101    68    76  100.5
Arithmetic mean  72.1    134.3    135.9    95.5    152.8  101.1  120.4  143.4
Standard deviation  48.0    143.0    147.3    86.9    161.1  101.8  124.2  169.6
Coefficient of variation    0.67        1.06        1.08      0.91        1.05      1.01      1.03      1.18
p-Value of Shapiro–Wilk  <0.001    <0.001    <0.001  <0.001    <0.001  <0.001  <0.001    <0.001
Minimum  26    10    10  18    10  12  10    13
Maximum3171439143951914398249721439

Descriptive statistics of indoor radon concentration

ParameterCRn
Number of rooms  602
Arithmetic mean (Bq·m−3)  125
Standard deviation (Bq·m−3)  135
Median (Bq·m−3)    84
Minimum value (Bq·m−3)    10
Maximum value (Bq·m−3)1439
Coefficient of variation (%)  108
Geometric mean (Bq·m−3)    88
Geometric standard deviation            2.23

Descriptive statistics of indoor radon concentration by municipalities

MunicipalitiesNumber of premisesAM (Bq/m3)SD (Bq/m3)CV (%)Mediana (Bq/m3)Min. (Bq/m3)Max. (Bq/m3)Test Shapiro–Wilk (p)
Berkovitsa123145118.9  8210731  6430.008
Boychinovtsi  27200177.9  8911031  6690.135
Brusartsi  13276426.2154  701314390.152
Vulchedrum122  96  96.4100  7012  8240.165
Varshets  18124  58.2  4712136  2310.120
Georgi Damyanovo  20  70  17.9  25  6445  1130.051
Lom  89  73  62.9  86  5618  4290.011
Medkovets  18246240.4  9814654  8530.162
Montana158130124.6  96  9610  9720.053
Chiprovtsi    6105  69.9  66  7255  2340.153
Yakimovo    8130134.6104  6444  3800.012
DOI: https://doi.org/10.2478/nuka-2023-0007 | Journal eISSN: 1508-5791 | Journal ISSN: 0029-5922
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Language: English
Page range: 51 - 56
Submitted on: Nov 15, 2022
|
Accepted on: Jan 16, 2023
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Published on: Apr 25, 2023
Published by: Institute of Nuclear Chemistry and Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
Bulgaria,
Effective dose,
Kindergarten,
Passive detector,
Radon concentration
Related subjects:
Chemistry,
Nuclear chemistry,
Physics,
Astronomy and astrophysics,
Physics, other

© 2023 Antoaneta Angelova, Nina Chobanova, Bistra Kunovska, Desislava Djunakova, Kremena Ivanova, Zdenka Stojanovska, published by Institute of Nuclear Chemistry and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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