polonium-210
the quality or state of being chromatic / the act or action of chromaticizing: the use of chromatic notes or tones (contrasted with diatonicism)
(aviation) Initialism of small unmanned aircraft system.
Alternative form of unfunctionalized
(physics) A radioactive isotope of polonium, ²¹⁰₈₄Po, having a half-life of 138 days; it as used as a reference alpha emitter in the calibration of radiation counters
研究室は、その試料に質量数210の放射性ポロニウム同位体が含まれていることを確認し、予期せぬアルファ線の観測を説明しました。
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