With regards to the size and speed of the emissions, alpha is a strongly ionising, weakly penetrating emission which moves slowly. This ability to strongly ionise also effects its range as it soon runs out of energy to decay particles, explaining its short range. Beta decay is lighter and has less charge which would explain the longer ionisation range but the smaller ionisation energy. A beta particle moves at a high velocity as it has a small mass and has not got a large ionisation energy and so can ionise longer distances and can therefore travel further.
Finally, Gamma can penetrate very large distances due to its lack of charge and ionising power. The poperties of Gamma radiation as an electromagnetic wave also allow it to travel at a high velocity, the speed of light, as it is emitted to release excess energy only and is not emitted in order to change the charge of the nucleus and so has very little ionising potential.
What is natural radioactive decay and how does this differ from nuclear fisson. Some atomic nuclei are naturally unstable, and they will spontaneously ""change"" in various ways according to the type of nucleus is being inspected. The possibilities for decay include beta decay, alpha decay, craigslist dating wyoming spontaneous fission.
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