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.	HPS Midyear - Issues in Waste Management 5-8 February 2012 Dallas, Texas
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.	Canadian Radiation Protection Association (CRPA) Annual Meeting 27-30 May 2012 Halifax, Nova Scotia
.	ACS Undergrad Summer Schools 10 June- 20 July 2012
.	Nuclear Regulatory Commission Meeting Webcasts February 2012 Bethesda, Maryland

09 February 2012

Alpha particle

A positively charged particle ejected spontaneously from the nuclei of some radioactive elements. It is identical to a helium nucleus that has a mass number of 4 and an electric charge of +2. It has low penetrating power and a short range (a few centimeters in air). The most energetic alpha particle will generally fail to penetrate the dead layers of cells covering the skin and can be easily stopped by a sheet of paper. Alpha particles represent much more of a health risk when emitted by radionuclides deposited inside the body.