Radium 225 about 2600 years alpha > Radium Emanation ? 3.8 days alpha > Radium-A ? 3 minutes alpha > Radium-B ? 21 minutes no rays > Radium-C ? 28 minutes alpha, beta, gamma > Radium-D ? about 40 years no rays > Radium-E ? 6 days beta (gamma) > Radium-F ? 143 days alpha ...英文原著 · 《Darwin and Modern Science》
Now radium itself is a constituent of uranium minerals, and two series of experiments by R.J. Strutt and B.B. Boltwood have shown that the content of radium, as measured by the radio-activity of the emanation, is directly proportional to the content of uranium. (Strutt, "Proc. Soc." A, February 1905; Boltwood, "Phil. Mag." April, 1905.) In Boltwood's investigation, some twenty minerals, with amounts of uranium varying from that in a specimen of uraninite with 74.65 per cent., to that in a monazite with 0.30 per cent., gave a ratio of uranium to radium, constant within about one part in ten.英文原著 · 《Darwin and Modern Science》
Turning to the other end of the radium series we are led to ask what becomes of radium-F when in turn it disintegrates? What is the final non- active product of the series of changes we have traced from uranium through actinium and radium?英文原著 · 《Darwin and Modern Science》
The activity of radium decays so slowly that it would not sink to half its initial value in less than some two thousand years, and yet one gramme of radium emits about 100 calories of heat during each hour of its existence.英文原著 · 《Darwin and Modern Science》
Of these products, A, B, and C constitute that part of the active deposit of the emanation which suffers rapid decay and nearly disappears in a few hours. Radium-D, continually producing its short-lived descendants E and F, remains for years on surfaces once exposed to the emanation, and makes delicate radio-active researches impossible in laboratories which have been contaminated by an escape of radium emanation.英文原著 · 《Darwin and Modern Science》
In a search for radio-activity in different minerals, M. and Mme Curie found a greater effect in pitch-blende than its contents of uranium warranted, and, led by the radio-active property alone, they succeeded, by a long series of chemical separations, in isolating compounds of a new and intensely radio-active substance which they named radium.英文原著 · 《Darwin and Modern Science》
♪ Six times ten to the eighth atoms of a radium in a lead jar ♪ ♪ Six times ten to the eighth atoms of radium ♪ ♪ If the half-life of radium should happen to pass ♪ ♪ Three times ten to the eighth atoms of a radium in a lead jar... ♪ Really hope you're almost to zero.美剧 · 《The Big Bang Theory》
"some mistakes,such as madam curie's discovery of radium, "turned out to have great scientific potential, "even though she would later die a slow, Painful death "from radiation poisoning.美剧 · 《The Big Bang Theory》