Radiotherapy - the use of ionizing radiation in order to control malignant cancer cells. An alternative you may wish to mention (I am assuming this is for some form of report and not personal use) is chemotherapy, which uses chemicals to do the same thing and is widely used today.
radioactive decay
Radioactive decay.
The nuclear fission process produces a range of lighter elements as fission products, and many of these are radioactive.
The nuclear fission process produces a range of lighter elements as fission products, and many of these are radioactive.
Absolute dating relies on radioactive decay of elements in a rock. When an igneous rock is formed it may contain elements that are a mixture.
It occurs due to the instability of the element. It is a spontaneous process. Radioactive atoms are known as isotopes.
The process where an element turns to another is radioactive decay, and exposure to radioactivity is dangerous.
Radioactive elements have unstable nucleii. When an unstable nucleus decays it emits energy in the form of electromagnetic waves and heavy particles and in the process forms new nucleii.
All elements with an atomic number >83 are naturally radioactive
nope! the machine reading the radioactive element number may break down and the calculated half life of the rock may be incorrect
Sounds to me like radiation from a radioactive isotope. The breaking down part would be the half-life. But the isotope won't completely break down. Only until it reaches a stable form. Such as, radium-226 decays finally to lead-206. During the process it emits charged Alpha particles.
While there are some stable synthetic elements (eg technetium) and also naturally occurring elements which are radioactively unstable (eg radium), synthetic elements are more likely to be radioactively unstable. Their decay process produces radioactive emissions which are hazardous.