helium dating
plural of tide wheel
(archaeology) a method of determining the age of rock that depends on the production of helium during the decay of various radioactive isotopes of uranium and thorium.
(physics) A rare stable isotope of argon, ³⁶₁₈Ar, having eighteen protons and eighteen neutrons; it amounts to about 0.3% of the element in nature
The state or condition of not putting in erect, upright, standing up position. / (of a penis) The condition of being not erect.
考古学者は、ウランやトリウムの同位体の崩壊で生成されるヘリウムを測定することで、埋葬地を取り巻く堆積層の年代を確定した。
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