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Radioactive Decay

Also known as nuclear decay, radioactive decay is the decrease of radiation through time.

540 Questions

What type of radiation is emitted when polonium forms lead-208?

Lead-208 is formed by alpha decay (emission of alpha particles) from polonium-212.

The age of dead sea scrolls was found by carbon dating Could this technique have worked if they were carved in stone tablets explain?

No. Carbon dating tells how long ago something died (more specifically, when it stopped absorbing carbon). Things that were never alive or are more than ~70,000 years old have to be dated by analyzing for other isotopes or isoptopic ratios. I started to explain carbon dating in more detail, but I realized I was going to have to write a short novel to explain it in any more detail and do a good job. So, unless something was written on a stone tablet by grinding a dead bird into the tablet, you could not carbon date text carved on stone. Similarly, carbon dating an old, written text tells you when the plant/animal that was used for a writing surface died. It does not tell you when the text was written (but I believe that, generally, the ages are fairly close).

What are the changes in the radioactive decay of carbon-14?

Carbon-14 undergoes beta decay, becoming nitrogen-14 which is stable.

What are the two quantities are always conserved in nuclear decay equation?

Energy and electrical charge are two quantities that are always conserved in nuclear decay equation.

What product of nuclear decay has mass but no charge?

Neutrons have no charge, but have mass. This is also true of neutrinos, though the mass is considered negligible for most purposes.

What type of radiation is cobalt 60?

Cobalt-60 decays by beta particle emission to highly excited isomers of Nickel-60, as these isomers relax to the ground state of Nickel-60 highly energetic gamma rays are emitted.

What type of radioactive decay removes a helium nucleus and has a very low enegry level?

A helium nucleus - more precisely, a helium-4 nucleus - is called an alpha particle. The corresponding decay would be called alpha decay.

What is the nuclear decay equation for plutonium 239?

The first step is an alpha decay to (guess what!) uranium 235. You can probably take it from there.

Do gamma rays have negative charge?

No, gamma rays are electromagnetic radiation which has no charge.

How did the physicist Becquerel first observe the effect of nuclear decay?

Becquerel was conducting experiments with phosphorescent minerals. Expose them to sunlight and they glow for a while. He placed these materials on photographic plates which had heavy paper on them to stop the sunlight from penetrating and exposing the plates. He prepares some photographic plates and it was overcast for several days and he could not do the experiment. He placed the plates in a desk drawer the first day and after several days of bad weather, decided to develop the plates anyway. They had been exposed. He looked in the drawer and it contained some ore samples containing uranium. The radioactive decay of the uranium had penetrated the paper coverings and had exposed the plates.

Why does cesium-137 undergo radioactive decay?

It's not just Cesium 137. Of the 3000 or so known isotopes, MOST undergo radioactive decay. Only a fairly small percentage of the isotopes are stable. Usually, stability is achieved when the amount of neutrons, compared to the amount of protons, is "just right" - not too few, not too many. For the heavier elements (beyond lead), stability is no longer possible for ANY isotope.

What is the antonym of carbon dating?

Either non-carbon dating, if that's what you mean, or nothing.

But technically, there is no real antonym of "carbon dating".

How is a beta particle produced?

A beta particle is produced in a process called beta decay, in which a neutron becomes a proton or vise versa. There are two forms of beta decay:

  1. normal beta decay - a neutron becomes a proton, a beta particle (i.e. electron) and an antineutrino
  2. antibeta decay - a proton becomes a neutron, an antibeta particle (i.e. positron) and a neutrino

What is the decay process that polonium undergoes?

All isotopes of polonium can undergo alpha decay, a small number of isotopes can also undergo beta decay, K capture decay, or gamma decay.

What does the process in which an unstable atomic nucleus emits charged particles or energy or both?

In the process of radioactive decay an unstable atomic nucleus emits energy to get closer to a state of stability. Whether this energy is emitted in particles, electromagnetic radiation, or both depends on which decay paths are available to the nucleus and which decay paths are forbidden to the nucleus by Quantum Mechanics.

Some of the decay processes are:

  • alpha - energy is released in the momentum of the ejected alpha particle (helium nucleus)
  • beta - energy is released in the momentum of the ejected electron or positron (and the hard to detect neutrino)
  • gamma - energy is released as electromagnetic radiation (gamma ray photon)
  • spontaneous fission - energy is released in the momentum of the ejected fission product atoms and the ejected neutrons