Affiliations: *Department of Protozoology, Faculty of Tropical Medicine, Mahodol University, Bangkok 10400
**National Institute of Health, Department of Medical Science Tiwanond Road, Nonthaburi 1100, Thailand
***Office of Atoms for Peace, Ministry of Science and Technology, Bangkok 10900
**** The Academy of Science,the Royal Institute, Bangkok 10200 ,Thailand
Source: Intern Med J Thai 2004; 20: 304-307
Water samples collected from nature hot spring in Lop Buri, Petchabun, Kamphangphet, and Uthai Thani during the period May – August 2004 were examined for dissolved radon gas and pathogenic organism. Tests revealed the presence of radon gas in all specimens, some of which exceed the safety limit, and the presence of Legionella spp., Naegleria spp. And Acanthameba spp. in sample collected from some hot spring.