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Lifetime Effective Dose Assessment Based on Background Outdoor Gamma Exposure in Chihuahua City, Mexico.

Luevano-Gurrola S, Perez-Tapia A, Pinedo-Alvarez C, Carrillo-Flores J, Montero-Cabrera ME, Renteria-Villalobos M - Int J Environ Res Public Health (2015)

Bottom Line: From the analysis, the spatial distribution of (232)Th, (226)Ra and (40)K is to the north, to the north-center and to the south of city, respectively.In conclusion, the natural background gamma dose received by the inhabitants of Chihuahua City is high and mainly due to the geological characteristics of the zone.From the radiological point of view, this kind of study allows us to identify the importance of manmade environments, which are often highly variable and difficult to characterize.

View Article: PubMed Central - PubMed

Affiliation: Facultad de Zootecnia y Ecología, Universidad Autónoma de Chihuahua, Perif. Francisco R. Almada km 1, 31415 Chihuahua, Mexico. sergio7_mex@hotmail.com.

ABSTRACT
Determining ionizing radiation in a geographic area serves to assess its effects on a population's health. The aim of this study was to evaluate the spatial distribution of the background environmental outdoor gamma dose rates in Chihuahua City. This study also estimated the annual effective dose and the lifetime cancer risks of the population of this city. To determine the outdoor gamma dose rate in air, the annual effective dose and the lifetime cancer risk, 48 sampling points were randomly selected in Chihuahua City. Outdoor gamma dose rate measurements were carried out by using a Geiger-Müller counter. Outdoor gamma dose rates ranged from 113 to 310 nGy·h(-1). At the same sites, 48 soil samples were taken to obtain the activity concentrations of (226)Ra, (232)Th and (40)K and to calculate their terrestrial gamma dose rates. Radioisotope activity concentrations were determined by gamma spectrometry. Calculated gamma dose rates ranged from 56 to 193 nGy·h(-1). Results indicated that the lifetime effective dose of the inhabitants of Chihuahua City is on average 19.8 mSv, resulting in a lifetime cancer risk of 0.001. In addition, the mean of the activity concentrations in soil were 52, 73 and 1097 Bq·kg(-1), for (226)Ra, (232)Th and (40)K, respectively. From the analysis, the spatial distribution of (232)Th, (226)Ra and (40)K is to the north, to the north-center and to the south of city, respectively. In conclusion, the natural background gamma dose received by the inhabitants of Chihuahua City is high and mainly due to the geological characteristics of the zone. From the radiological point of view, this kind of study allows us to identify the importance of manmade environments, which are often highly variable and difficult to characterize.

No MeSH data available.


Related in: MedlinePlus

Spatial distribution of the radioisotope activity concentration found in soil: (a) 226Ra; (b) 232Th; and (c) 40K.
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ijerph-12-12324-f003: Spatial distribution of the radioisotope activity concentration found in soil: (a) 226Ra; (b) 232Th; and (c) 40K.

Mentions: The results of radioisotope activity concentrations in soil and their spatial distribution are shown in Table 2 and Figure 3, respectively. The means of activity concentrations in soil were 52, 73 and 1097 Bq·kg−1, for 226Ra, 232Th and 40K (with <3% relative uncertainty), respectively. In addition, ANOVA analysis did not show a statistical significance among zones for the activity concentrations in soil of 226Ra (p = 0.005) and 232Th (p = 0.03). Otherwise, 40K contents were statistically differently distributed (p = 0.6) in the zones established. The determination of the annual effective dose (AED), measured in air and calculated from soil is shown Table 3.


Lifetime Effective Dose Assessment Based on Background Outdoor Gamma Exposure in Chihuahua City, Mexico.

Luevano-Gurrola S, Perez-Tapia A, Pinedo-Alvarez C, Carrillo-Flores J, Montero-Cabrera ME, Renteria-Villalobos M - Int J Environ Res Public Health (2015)

Spatial distribution of the radioisotope activity concentration found in soil: (a) 226Ra; (b) 232Th; and (c) 40K.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4626971&req=5

ijerph-12-12324-f003: Spatial distribution of the radioisotope activity concentration found in soil: (a) 226Ra; (b) 232Th; and (c) 40K.
Mentions: The results of radioisotope activity concentrations in soil and their spatial distribution are shown in Table 2 and Figure 3, respectively. The means of activity concentrations in soil were 52, 73 and 1097 Bq·kg−1, for 226Ra, 232Th and 40K (with <3% relative uncertainty), respectively. In addition, ANOVA analysis did not show a statistical significance among zones for the activity concentrations in soil of 226Ra (p = 0.005) and 232Th (p = 0.03). Otherwise, 40K contents were statistically differently distributed (p = 0.6) in the zones established. The determination of the annual effective dose (AED), measured in air and calculated from soil is shown Table 3.

Bottom Line: From the analysis, the spatial distribution of (232)Th, (226)Ra and (40)K is to the north, to the north-center and to the south of city, respectively.In conclusion, the natural background gamma dose received by the inhabitants of Chihuahua City is high and mainly due to the geological characteristics of the zone.From the radiological point of view, this kind of study allows us to identify the importance of manmade environments, which are often highly variable and difficult to characterize.

View Article: PubMed Central - PubMed

Affiliation: Facultad de Zootecnia y Ecología, Universidad Autónoma de Chihuahua, Perif. Francisco R. Almada km 1, 31415 Chihuahua, Mexico. sergio7_mex@hotmail.com.

ABSTRACT
Determining ionizing radiation in a geographic area serves to assess its effects on a population's health. The aim of this study was to evaluate the spatial distribution of the background environmental outdoor gamma dose rates in Chihuahua City. This study also estimated the annual effective dose and the lifetime cancer risks of the population of this city. To determine the outdoor gamma dose rate in air, the annual effective dose and the lifetime cancer risk, 48 sampling points were randomly selected in Chihuahua City. Outdoor gamma dose rate measurements were carried out by using a Geiger-Müller counter. Outdoor gamma dose rates ranged from 113 to 310 nGy·h(-1). At the same sites, 48 soil samples were taken to obtain the activity concentrations of (226)Ra, (232)Th and (40)K and to calculate their terrestrial gamma dose rates. Radioisotope activity concentrations were determined by gamma spectrometry. Calculated gamma dose rates ranged from 56 to 193 nGy·h(-1). Results indicated that the lifetime effective dose of the inhabitants of Chihuahua City is on average 19.8 mSv, resulting in a lifetime cancer risk of 0.001. In addition, the mean of the activity concentrations in soil were 52, 73 and 1097 Bq·kg(-1), for (226)Ra, (232)Th and (40)K, respectively. From the analysis, the spatial distribution of (232)Th, (226)Ra and (40)K is to the north, to the north-center and to the south of city, respectively. In conclusion, the natural background gamma dose received by the inhabitants of Chihuahua City is high and mainly due to the geological characteristics of the zone. From the radiological point of view, this kind of study allows us to identify the importance of manmade environments, which are often highly variable and difficult to characterize.

No MeSH data available.


Related in: MedlinePlus