Absolute dating radiocarbon dating. The development of accelerator mass spectrometry (AMS) dating, which allows a date to be obtained from a very small sample, has been very useful in this regard. Other radiometric dating techniques are available for earlier periods. One of the most widely used is potassium–argon dating (K–Ar dating). Potassium-40 is a radioactive isotope of potassium that decays into argon-40. The half-life of potassium-40 is 1.3 billion years, far longer than that of carbon-14, allowing much older samples to be dated. Potassium is common in rocks and minerals, allowing many samples of geochronological or archeological interest to be dated. Argon,
Isotope 244 expected release date in the fourth quarter of 2012. Isotope 244 Isotope 244 is a video game developer, based in the USA. It was founded by James Bryant in 1999. Isotope 244 is best known for developing retro remakes and real-time strategy genres for both desktop and mobile devices. Isotope 244 was also a leading developer of 3D screensavers in the early 2000s. The company received several mentions for its retrogaming and real-time strategy games, above all on portable platforms. IP Atomic Cannon Pocket was a notable turn-based strategy game available on the Pocket PC. It was the top selling