What's New?
.	Fukushima Decontamination Report
.	CRCPD & CDC Grants for Volunteer Corps
.	America's Nuclear Future
.	February Newsletter
.	Boice Nominated President of NCRP
.	February Journal
.	February ORS
.	Schauer Given the Butterfly Award from Image Gently
.	Kase President's Report to IRPA
.	IRPA13 Accepting Posters

Upcoming Events
.	HPS Midyear - Issues in Waste Management 5-8 February 2012 Dallas, Texas
.	NRC Regulatory Information Conference NRC Regulatory Information Conference 13-15 March 2012 Rockville, Maryland
.	NCRP Annual Meeting 12-13 March 2012 Washington, DC
.	James E. Turner Memorial Symposium Call for Abstracts 18-19 April 2012 Oak Ridge Associated Universities, Pollard Auditorium, Oak Ridge, Tennessee
.	IRPA13 13-18 May 2012 Glasgow, Scotland
.	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

Half-life (effective)

The time required for a radionuclide contained in a biological system, such as a human or an animal, to reduce its activity by one-half as a combined result of radioactive decay and biological elimination.