what exactly is the decay that you mentioned earlier?
It  is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive.
Radioactive decay
is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive.
where can helium be found in the world Most helium on Earth is a result of radioactive decay. Helium is found in large amounts in minerals of uranium and thorium, including uraninite and its varieties cleveite and pitchblende, carnotite and monazite. what are some of its uses? The largest use is in cryogenic applications, most of which involves cooling the superconducting magnets in medical MRI scanners and NMR spectrometers. who discovered it? Astronomer Jules Janssen when was it discovered? August 18, 1868 is this element hazardous? Neutral helium at standard conditions is non-toxic, plays no biological role and is found in trace amounts in human blood. When a person speaks after inhaling helium gas, it  causes a change in timbre of the amplified sound, resulting in a reedy, duck-like vocal quality.
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Radioactive decay [SEP] Introduction
Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles or photons. The weak force is the mechanism that is responsible for beta decay. Radioactive decay is a stochastic (i.e. random) process at the level of single atoms. According to quantum theory, it is impossible to predict when a particular atom will decay, regardless of how long the atom has existed.