Sodium-22
Cesium-137
Iodine-131 is a decaying radioisotope that produces xenon-131 through beta decay. During beta decay, a neutron is transformed into a proton within the nucleus, and a beta particle (an electron) is emitted, resulting in the production of xenon-131.
A PET scan uses radioisotope decay by detecting the pair of annihilation photons emitted during the decay process.
There is no one answer for an individual atom, but for a given radioisotope we usually quantify the rate of decay via the half-life, i.e. the average time it takes for half of the atoms of an isotope to decay. Realizing that some isotopes will decay to another radioisotope before eventually decaying to a stable product, this can get even more complicated. In mathematical terms the equation for concentration of the radioisotope approaches zero asymptotically. The math says that you will never get zero concentration - but of course atoms are discrete entities so that once the concentration predicted by the math drops below one atom, you have reached zero in the real world.
This isotope is transformed in another isotope of another element.
Bismuth-214
Cesium-137
Same mass, atomic number one lower - Cs - caesium
Iodine-131 is a decaying radioisotope that produces xenon-131 through beta decay. During beta decay, a neutron is transformed into a proton within the nucleus, and a beta particle (an electron) is emitted, resulting in the production of xenon-131.
A PET scan uses radioisotope decay by detecting the pair of annihilation photons emitted during the decay process.
How long it takes for half of a sample to decay to another form.
The half-life of a radioisotope is the time it takes for half of the radioactive nuclei in a sample to decay. It is a characteristic property of each radioisotope and determines the rate at which the isotopes decay.
The rate of decay for a radioactive sample
The rate of decay for a radioactive sample
radiating to kill cancer cells
It is an example of radioactive decay.
The length of time required for half of a sample of radioactive material to decay