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เอกสารมาตรฐาน
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APHA
SMWW 7110
Gross Alpha and Gross Beta Radioactivity (Total, Suspended, and Dissolved)
2023
24
Standard methods for the examination of water and wastewater (543.3 APHA 24th ed. Ref. Treatises&monographs FL2)
Natural radioactivity: Uranium-238, uranium-235, and thorium-232 are naturally-occurring radioactive elements. These primordial radionuclides were present at the formation of earth and are ubiquitous trace constituents in the earth’s crust...