The main objectives of this study were to evaluate the geochemical characteristics, reservoir temperatures (related to the natural ambient gamma radiation levels), and natural background radiation levels of the geothermal spring attractions in Central and Western Thailand. The hydrochemical properties of the geothermal waters revealed that K + -Na + bicarbonate dominates the geochemistry of these hot spring waters. Due to their chemical characteristics, the geothermal waters reflect the homogeneity of the geological formations, which indicates that limestone originated and mixed with shallow groundwater/freshwater. On the other hand, no significant correlations were found between the reservoir temperatures and naturally occurring background radiation levels. The natural background radiation levels were investigated at the main pool and 10 m from the main pool. In addition, the annual effective dose equivalent (AEDE) and excess lifetime cancer risk (ELCR) would be considered in the areas with low natural background radiation levels. The highest averages for the AEDEs and the ELCRs were discovered in the Ratchaburi Hot Spring (RB1), at approximately 0.48 and 1.90 mSv/year, respectively. Although the ELCR is slightly higher than the annual average effective dose (1.45 mSv/year) due to the natural background radiation, a preventive strategy should be considered to protect the effects on visitors' health.
Design for gravimeter capacitor, the first model contains dielectric constant κ in partially filled with material and the second contain dielectric constant κ 1 in space between the cylinder is half-filled by a semi-cylindrical. Thus, capacitance varies in accordance with the length of the device in the cylindrical conductor or when the length of the device in the cylindrical capacitor varies in accordance with at various test locations. It can easily be shown that a change in height of approximately 1 m results in a change in the gravitational acceleration of Δg =-0.0031 cm/s 2 whereas the value of the gravitational acceleration at Ramkhamhaeng university Bangkok, Thailand used as the reference point was equal to 978.310 cm/s 2 .
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