scholarly journals Vertical distribution of the radon concentration at Batu Pahat district, Johor, Malaysia

2020 ◽  
Vol 16 (3) ◽  
pp. 324-327
Author(s):  
Muneer Aziz Saleh ◽  
Syed Nurhaizam Syed Othman ◽  
Khaidzir Hamzah ◽  
Jasman Zainal
Keyword(s):  
Vertical Distribution ◽  
Radon Concentration ◽  
Pearson Correlation ◽  
Gamma Dose ◽  
Soil Gas ◽  
Soil Types ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
Radon Measurements ◽  
Radon Concentrations

This study investigated the vertical distribution of radon, 222Rn concentrations in soil gas for different soil types and found the relation between the measured gamma dose rates and radon concentrations. The 222Rn concentrations in soil gas were measured at depth of 20 cm, 60 cm, 80 cm and 100 cm using semiconductor detector (RAD7) coupled with soil gas probe. The overall activity concentrations of 222Rnin soil were ranged from Minimum Detectable Activity (MDA)to 54000 ± 3000 Bq m−3 in Batu Pahat District. The results showed that the overall highest concentration of 222Rn was recorded at 40 cm depth for most of the soil types, which could be the most reliable for taking the radon measurements than other depths. Soil type 32 (Dystric Nitosolse Orthic Ferrasols-Rengam Jerangau) has the highest radon concentration, which was 12,462 ± 5237 Bq m-3.  The gamma dose rates (GDR) above 1 m were measured using portable survey meters (Ludlum 19). A good relationship between radon concentrations in soil gas and the measured gamma dose rates was observed using Pearson Correlation. The results of 222Rn concentration in soil gas obtained from this study were in agreement with results reported by other researchers.

In situ measurement of terrestrial gamma dose rates in eastern region of Peninsular Malaysia and its relation to geological formation and soil types

2019 ◽  
Vol 107 (6) ◽  
pp. 503-516 ◽  
Author(s):  
Muneer Aziz Saleh ◽  
Ahmad Termizi Ramli ◽  
Khaidzir Bin Hamzah ◽  
Jasman Zainal ◽  
Mohsin Mohd Sies ◽  
...  
Keyword(s):  
Effective Dose ◽  
Mean Value ◽  
Peninsular Malaysia ◽  
Gamma Dose ◽  
Soil Types ◽  
Eastern Region ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
Geological Formation ◽  
Geological Formations

Abstract This present study aims to obtain baseline data of environmental terrestrial radiation and to assess the corresponding health risk in the ambient environment in eastern region of Peninsular Malaysia. The measurements were taken 1 m above the soil surface using NaI [Ti] detector with a total of 2144 measured points which covered all geological formations and soil types. The measured gamma dose rates ranged from 26 nGy h−1 to 750 nGy h−1 with a mean value of 172±90 nGy h−1. The mean gamma dose rate is three times higher than world averages of 57 nGy h−1. The data of gamma dose rates show the reading of the gamma dose rates not fit to the normal distribution. The variations of gamma dose rates based on geological formation and soil types were investigated using the unbalanced one way ANOVA. The results indicated strong significant differences due to the different geological formations and soil types. The T-test of gamma dose rates for each pair of soil types or geological formations and their hypothesis test at 95 % confidential level were compared to shows the significant difference between each pairs. The results indicate that the gamma dose rates for all pairs of soil types were significant differed except the miscellaneous soil while the gamma dose rates of the pairs of geological formation were also significant differed except the intermediate and intrusive geological formations. Acid intrusive and intermediate intrusive geological formations has the highest mean values of 223 nGy h−1 and 278 nGy h−1, respectively. These values are approximately four and five times the world average. Soil type (Steep land) has the highest gamma dose rate with the mean value of 215 nGy h−1. The radiological health information which are the total annual effective dose equivalent, the collective effective dose, lifetime effective dose and the lifetime cancer risk for each person are 0.844 mSv, 3.53×103 man Sv y−1, 59.10 mSv and 3.25×10−3, respectively. The results in eastern region of Peninsular Malaysia were comparable to different areas in Malaysia, which indicate the value reported in UNSCEAR, 2000 should be adjusted to the current status in Malaysia.

scholarly journals Indoor radon levels and total gamma dose rates measurements in Portuguese thermal spas

2017 ◽  
Vol 1 (1) ◽  
pp. 79-87
Author(s):  
A. S. Silva ◽  
M. L. Dinis
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Extended Period ◽  
Geiger Counter ◽  
Gamma Dose ◽  
International Standards ◽  
Reference Level ◽  
Indoor Radon Concentration ◽  
Dose Rates ◽  
Gamma Dose Rates

In this study, an assessment of indoor radon concentration and gamma dose rates were carried out in 16 Portuguese thermal spas. Indoor gamma dose rates measurements were made using a Geiger counter (Gamma Scout – GS3) and radon concentration measurements were carried out using CR-39 detectors. The detectors were exposed for an extended period of time (in average 42 days). The results showed that gamma doses rates are generally low but, in several cases, radon concentration exceeded national as well as international standards, namely the reference level recommended by the Directive 2013/59/EURATOM (300 Bq/m3) and the threshold for protection (400 Bq/m3) from the Portuguese legislation. The annual effective doses deriving from external radiation (gamma dose rates) and indoor radon concentration showed the need to implement measures to optimize the radiation protection of the workers against ionizing radiation.

scholarly journals Temporal changes in gamma dose rates in the Esk Estuary, UK

2011 ◽  
Vol 46 (6) ◽  
pp. S301-S307 ◽  
Author(s):  
M.D. Wood ◽  
D. Copplestone
Keyword(s):  
Temporal Changes ◽  
Gamma Dose ◽  
Dose Rates ◽  
Gamma Dose Rates

Assessment of gamma dose rates from terrestrial exposure in Serbia and Montenegro

2006 ◽  
Vol 121 (3) ◽  
pp. 297-302 ◽  
Author(s):  
S. Dragović ◽  
Lj. Janković ◽  
A. Onjia
Keyword(s):  
Gamma Dose ◽  
Serbia And Montenegro ◽  
Dose Rates ◽  
Gamma Dose Rates
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