Sentences with phrase «radioactive decay time»

Reburning spent rods in an SFR also reduces their radioactive decay time; the resulting waste would have to be sequestered for only a few hundred years instead of several thousand.

Not exact matches

The only previously known radioactive carbon isotope at the time was carbon - 11, which had a half - life of only 21 minutes (half the isotope's radioactivity will decay in that time).

For instance, physicists have shown that two identical radioactive atoms will decay at different times.

Since 129 - Xenon is produced by radioactive decay of 129 - Iodine, these xenon isotopes put a time stamp on the formation age of the ancient parcel of mantle to within the first 100 million years of Earth's history.

Each radioactive element decays exponentially, decreasing over time (t) at a rate proportional to the number of atoms there are (N).

It is one of the heaviest - known elements, yet it does not occur naturally because all of its isotopes are radioactive and decay rapidly on a geological time scale,» said the study's lead author, François Tissot, UChicago PhD» 15, now a W.O. Crosby Postdoctoral Fellow at the Massachusetts Institute of Technology.

The Man Who Found Time James Hutton and the Discovery of Earth's Antiquity Jack Repcheck, Perseus, $ 26 In days of old — before scientists realized that radioactive decay could act as a gauge to Earth's age — scholars consulted the scriptures for clues to Earth's antiquity.

The researchers were able, for the first time worldwide, to observe the radioactive decay of artificially generated nuclei of super-heavy hydrogen at the Mainz MAMI particle accelerator using a combination of several magnetic spectrometers.

The clusters of lead atoms formed 1 billion years after crystallization of the zircon, by which time the radioactive decay of uranium had formed the lead atoms that then diffused into clusters during reheating.

Otaki and colleagues collected leaves 16 to 20 months after the accident, after short - lived radioactive contamination had decayed, but this time from locations ranging from 59 to 1760 kilometers from the power plant; contamination levels ranged from 161 to 0.2 Bq / kg.

Fossil fuels lack a type of radioactive carbon, an isotope called carbon - 14, which decays over time.

The half - life of a radioactive element is the time it takes for half of its atoms to decay into

For first order decays (think simple radioactive decay) where the rate constant k does not change over time the rate of change of x with respect to time, dx / dt, in other words how fast it decays,

Just because we can say something is halved in a certain time doesn't necessarily mean that the concept of «half life» is valid over a full range of parameters as it would with, say, with radioactive decay.

The 5 years is time in the atmosphere and NOT the radioactive decay rate.

Over time radioactive isotopes decay to harmless materials.