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User contributions for Brad4sci

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31 January 2012

18 November 2011

4 November 2011

  • 05:1105:11, 4 November 2011 diff hist +591 N File:Americium fire detector.jpgMost smoke detectors use a small pellet of americium-241 (atomic number 95), used to ionize the air to detect smoke particles. Americium-241 is a synthetic, radioactive heavy isotope with a half-life of 432.2 years. It decays via alpha emission and spont current
  • 05:0305:03, 4 November 2011 diff hist +606 N File:Americium.jpgThis is about 0.2 micrograms of Am-241, and it emits about 1 microcurie of alpha radiation. These are commonly found in ionizing smoke alarms. Even though it's radioactive, it's not very dangerous. A piece of paper, a few centimeters of air, or even the l current

10 December 2010

3 December 2010

17 May 2010

  • 22:0422:04, 17 May 2010 diff hist +455 N File:Desert ironwood.jpgdesert ironwood (''Olneya tesota'') Photographer: Howard F. Schwartz, Colorado State University, United States Description: A desert ironwood at the Phoenix Botanical Gardens in Arizona. Image taken in: Arizona, United States

25 February 2010

1 December 2009