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Argon (18 Ar) has 26 known isotopes, from 29 Ar to 54 Ar, of which three are stable (36 Ar, 38 Ar, and 40 Ar). On the Earth, 40 Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39 Ar with a half-life of 268 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days.
Ar in Earth's atmosphere, which is only 31.5 ppmv (= 9340 ppmv × 0.337%), comparable with that of neon (18.18 ppmv) on Earth and with interplanetary gasses, measured by probes. The atmospheres of Mars, Mercury and Titan (the largest moon of Saturn) contain argon, predominantly as 40 Ar. [29] The predominance of radiogenic 40
Argon ST logo before Boeing acquisition. Argon ST was created with the merger of SenSyTech, Inc. and Argon Engineering Associates on September 29, 2004. In August 2006, Argon ST acquired Innovative Research, Ideas & Services Corporation (IRIS), the authors of the sensor fusion software Transducer Markup Language (TML).
U.S. Senator Elizabeth Warren is proposing legislation that would make defense contractors give the U.S. military a "right to repair" its equipment, and require the Department of Defense to ...
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Argonne has five areas of focus, as stated by the laboratory in 2022, including scientific discovery in physical and life sciences; energy and climate research; global security advances to protect society; operating research facilities that support thousands of scientists and engineers from around the world; and developing the scientific and technological workforce.
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