radioactivity of

The radioactivity of fallout decays rapidly at first.

This application is hindered by the scarcity, high cost and radioactivity of curium isotopes.

The high radioactivity of einsteinium-253 produces a visible glow and rapidly damages its crystalline metal lattice, with released heat of about 1000 watts per gram.

But because of the short half-life of radon and the radioactivity of its compounds, it has not been possible to study the compound in any detail.

However, radioactivity of this nuclear isomer has never been observed.

This would transmute the tantalum into the radioactive isotope < sup > 182 </ sup > Ta, which has a half-life of 114. 4 days and produces gamma rays with approximately 1. 12 million electron-volts ( MeV ) of energy apiece, which would significantly increase the radioactivity of the nuclear fallout from the explosion for several months.

The discovery of the radioactivity of uranium ushered in additional scientific and practical uses of the element.

The radioactivity of all nuclear waste diminishes with time.

This is a concern since if the waste is stored, perhaps in deep geological storage, over many years the fission products decay, decreasing the radioactivity of the waste and making the plutonium easier to access.

U-238 has a much longer halflife than the lighter isotopes, and DU therefore emits less alpha radiation than the same mass of natural uranium: the US Defense Department states DU used in US munitions has 60 % the radioactivity of natural uranium.

Unless the physically small reactors have been run for an extended period, the radioactivity of these elements is quite low and would pose a minimal hazard.

In 1934, he participated in the discovery of the artificial radioactivity of fluorine and aluminium which would be critical in the development of the atomic bomb.

Pacini concluded from the decrease of radioactivity underwater that a certain part of the ionization must be due to sources other than the radioactivity of the Earth.

Even before the laws of quantum mechanics were developed to their present level, the radioactivity of such elements has posed a challenge to determinism due to its unpredictability.

* 1896 Antoine Becquerel discovers the radioactivity of uranium

Libby estimated that the radioactivity of exchangeable carbon-14 would be about 14 disintegrations per minute ( dpm ) per gram of pure carbon, and this is still used as the activity of the modern radiocarbon standard .< ref > In 1960, Libby was awarded the Nobel Prize in chemistry for this work.

When measuring radioactivity of a sample with a detector, a unit of " counts per second " ( cps ) or " counts per minute " ( cpm ) is often used.

A physical example might be the rapidly decreasing radioactivity of the smoke detectors mentioned earlier.

Dante was designed to acquire gas samples from the magma lake inside the inner crater of Mount Erebus in order to understand the chemistry better through the use of the on-board gas chromatograph as well as measuring the temperature inside the volcano and the radioactivity of the materials present in such volcanoes.

Eliminating them eliminates much of the long-term radioactivity of spent nuclear fuel.

( It should be stressed, however, that microorganisms cannot decrease the total radioactivity of nuclear waste.

They used radiometric methods to identify which stream the radioactivity was in after each chemical separation ; they separated the uranium ore into each of the different chemical elements that were known at the time, and measured the radioactivity of each fraction.

Heat sources include gravitational energy released by the compression of the core, gravitational energy released by the rejection of light elements ( probably sulfur, oxygen, or silicon ) at the inner core boundary as it grows, latent heat of crystallization at the inner core boundary, and radioactivity of potassium, uranium and thorium.

The radioactivity of the particles decreases with time, with different isotopes being significant at different timespans.

Hence, the spontaneous fission of these isotopes is usually negligible, except in using the exact branching ratios when finding the radioactivity of a sample of these elements.