Three types of Radiation
1) Alpha radiation is a helium nucleus. the charge of an alpha particle is +2 
2)Beta radiation: A beta particle is an electron , the charge of a beta particle is -1. 
3) Gamma Radiation is a high energy form of electromagnetic radiation, it is not a particle. 
＊ Radiation exposure can be decreased by shielding, distance, duration of exposure, and radioactive decay.
＊ Lead is a good example that is good for shielding gamma rays. ＊ Water is also a good shielding material.
＊ Radiation drops off as you move furthur away. 1/distance2
martha said,
FebruaryUTCbSat, 24 Feb 2007 22:39:09 +0000000000pmSat, 24 Feb 2007 22:39:09 +000007 13, 2007 @ 7:08 p02
i am so lost in science class = =