High background radiation valley formed by Peitou Hot Spring

Chen, Ching-Jiang; Lin, Pei-Hou; Huang, Ching-Chung

doi:10.1016/j.ics.2004.11.168

Cited by 8 publications

(6 citation statements)

References 2 publications

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“…The activity concentrations (C A 's) of Th-series nuclides are higher than that of U-series (Table 2), which is consistent with the observation of background radiation in this area [6]. The trends for C A 's of the long-life Th-series nuclides (including 232 Th, 228 Ra, and 228 Th) in water are similar Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 5/31/15 1:09 PM Table 2.…”

Section: Disequilibrium Of Th-seriessupporting

confidence: 88%

“…Hokutolite has been regarded even more precious than gold, which is mainly composed of plumbian barite [(Ba, Pb)SO 4 ] in chemistry [5]. Hokutolite is celebrated for its radioactivity originating from radium and thorium precipitating from geothermal waters [6]. The spring water of the studied area is hot and achromatous with a strongly acidic odor, which cools as it flows into the creek.…”

Section: Introductionmentioning

confidence: 99%

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Impact of water environmental change and migration of radionuclides on Hokutolite conservation in Peito (Taiwan)

Lin¹,

Tsai

Lung

2012

Radiochimica Acta

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Chemical factors (including pH, redox potential, content of total organic compound (TOC) and major ions) and U/Th-series radionuclides in the hot-spring water environment of Peito were determined to investigate the impact of environmental change and migration of radionuclides in water on conserving the precious mineral, hokutolite, in Peito (Taiwan). The activity concentrations of U/Th increased with E h and those of Cl − and SO 4 2− . 234 U/ 238 U ratios were nearly > 1 ascribed to Szilárd-Chalmers effect and α-recoil. 230 Th/ 234 U ratios were < 1 resulting from complexation with chloride and sulfate ions. 228 Ra and 226 Ra activities were governed by pH, E h and SO 4 2− concentration. Disequilibria of 228 Th/ 228 Ra and 228 Ra/ 232 Th were evident attributed to complexation of Th with major anions and co-precipitation of radium with (Ba,Pb)SO 4 . Alpha-recoil caused the enrichment of 228 Ra and apparent disequilibrium of 232 Th/ 228 Th. A mechanism illustrating the radiochemistry involving the formation of hokutolite in Peito was derived accordingly. The water environment of the studied area was found apparently changed in light of the variation of temperature, TOC and concentration ratio of Ba/Pb, which resulted from the channeling of hot spring water and the release of household waste water. The water environmental change can thus hinder the migration of radionuclides as well as the formation of hokutolite so that the performance of hokutolite conservation can be decreased. Immediate enactment of regulations for conserving hokutolite in Peito was therefore suggested in this research.

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Section: Disequilibrium Of Th-seriessupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Impact of water environmental change and migration of radionuclides on Hokutolite conservation in Peito (Taiwan)

Lin¹,

Tsai

Lung

2012

Radiochimica Acta

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“…Moreover, the studies also include trace element compositions and reservoir temperatures of the geothermal waters [6,9]. It is important to identify the qualities and types of geothermal waters, as well as the reservoir temperatures, that are possibly related to the natural background radiation levels [9,11]. Therefore, the properties of the geothermal waters could signify health risks and affect users of the natural pools and spas (bathing), an essential part of the development of geothermal attractions in Thailand.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, hazards of high background radiation levels in the geothermal attractions must be considered. Most of the reports of different geothermal locations around the world have focused on workers and frequent travelers in geothermal spring areas who are not only exposed to low radiation doses and longterm background radiation but also not aware of any negative effects [11][12][13]. For example, Ramsar in Iran, Guarapari in Brazil, Kerala in India, Yangjiang in China, and parts of the Flinders Ranges in South Australia are locations with these high background levels [11,13].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogeochemical characteristics and terrestrial radiation of geothermal spring attractions in Central and Western Thailand

Ngansom¹,

Mahapattanathai²,

Maksuwan³

et al. 2022

ScienceAsia

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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.

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Application of ICP-QMS for the determination of ultratrace-levels of 226Ra in geothermal water and sediment samples

Tsai

Lin

Wang

et al. 2010

J Radioanal Nucl Chem

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High background radiation valley formed by Peitou Hot Spring

Cited by 8 publications

References 2 publications

Impact of water environmental change and migration of radionuclides on Hokutolite conservation in Peito (Taiwan)

Impact of water environmental change and migration of radionuclides on Hokutolite conservation in Peito (Taiwan)

Hydrogeochemical characteristics and terrestrial radiation of geothermal spring attractions in Central and Western Thailand

Application of ICP-QMS for the determination of ultratrace-levels of 226Ra in geothermal water and sediment samples

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