barium-140

barium-140

[′bar·ē·əm ‚wən′fȯrd·ē]
(nuclear physics)
A radioactive isotope of barium with atomic mass 140; the half-life is 12.8 days, and the decay is by negative beta-particle emission.
References in periodicals archive ?
Elements that appeared to cause the greatest contamination are the isotopes of iodine and strontium although barium-140 and cesium-137 also contribute to the peril.
During the 1930s, many new nuclides were found, many of them by serendipity, until finally in 1939 Otto Hahn proved that a suspected radium isotope was in fact barium-140.