Decay Constant 2 : the fraction of a number of atoms of a radioactive nuclide that disintegrates in a unit of time. The decay constant is inversely proportional to the radioactive half-life
James M. Smith, Ph.D. & Marie A. Spano, M.S., Interim Guidelines for Hospital Response to Mass Casualties from a Radiological Incident, Glossary of Radiological Terms & Acronyms, Division of Environmental Hazards and Health Effects, National Center for Environmental Health (and Centers for Disease Control and Prevention CDC Radiation Emergencies), USA 2003. http://www.bt.cdc.gov/radiation/pdf/masscasualties guidelines.pdf, (Rad - Amer) {934}
