Half-life (disambiguation)

Look up half-life in Wiktionary, the free dictionary.

Half-life is a mathematical and scientific description of exponential or gradual decay.

Half-life may also refer to:

• Biological half-life, the time it takes for a substance to lose half of its pharmacologic, physiologic, or radiologic activity
• Effective half-life, the effective radioactive half-life in organisms after accounting for excretion
• Half-Life (series), a video game series
  • Half-Life (video game), a 1998 game and the first title in the series
  • Half-Life 2, a 2004 sequel
• Halflife (comics), the name of two different Marvel comic characters
• Half-Life (novel), a 2004 novel by Aaron Krach
• Half Life (novel), a 2006 novel by Shelley Jackson
• Half Life (3 album), 2001
• Halflife (EP), by Lacuna Coil
• Half-Life E.P., by Local H
• Half Life: A Parable for the Nuclear Age, a 1985 Australian documentary film
• Half-Life (film), a 2008 independent film by Jennifer Phang
• Halflife (Doctor Who), a 2004 BBC Books original novel written by Mark Michalowski
• "Half Life" (Medical Investigation), episode 17 of the first season of Medical Investigation which had a crossover with an episode of Third Watch titled "In the Family Way"
• "Half Life", a song by 10 Years from The Autumn Effect