I cannot fully answer this question yet as I am currently studying this subject but they are used to treat skin cancer. They cannot be used to treat all types of cancer because if a beta particle was to penetrate the skin and go inside your body then this could be very devestating. If we used gamma to treat skin cancer then we would be putting these powerful EM waves right through the whole body which would be pretty pointless!
I really hope this helps
Gamma radiation is the most energetic and penetrating of the options provided, followed by the alpha particle, beta particle, and antineutrino, in descending order.
Alpha Particle
Alpha (and beta) radiation is "particle radiation" Gamma is electro-magnetic radiation.
Alpha and Beta Radiation are types of ionizing radiation. They are both charged particles though Alpha is heavier than the particle Beta.
A beta particle is an electron, with a mass of approximately 1/1840 of a proton
When (^{222}Rn) emits a beta particle, it transforms into (^{222}Fr), which is Francium.
This particle is a neutron:neutron-----------proton + electron + neutrino
No Alpha radiation is essentially a helium nucleus - a couple of protons and neutrons bound together as a particle Beta radiation is an electron or positron - still a particle but not the same kind of particle as alpha.
A radiation consisting of a single electron is known as beta radiation. This type of radiation occurs during beta decay when a neutron transforms into a proton, electron, and antineutrino. Beta radiation is commonly emitted by radioactive substances and has the ability to penetrate materials and cause ionization.
Though both are forms of ionizing radiation, an X-ray is a form of electromagnetic radiation, while a beta ray is actually a beta particle. The beta particle is a form of particulate radiation, and the beta particle could be either an electron or a positron.
A beta particle is a negative electron. A positive electron is a Positron.
An particle of alpha-radiation consists of two protons and two neutrons. It is a highly charged particle and is thus highly ionising. It is therefore highly dangerous. Because of its size, it penetrates very little, being stopped even by a thin sheet of paper. The other forms of radiation are beta-radiation and gamma-radiation. Beta-radiation consists of a high-speed electron, whereas gamma-radiation is a high-energy electromagnetic wave.