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High Quality Content by WIKIPEDIA articles! 151Sm is a radioisotope of samarium with a half-life of 90 years, undergoing low-energy beta decay, and has a fission product yield of 0.4203% for thermal neutrons and U-235, about 39% of Sm-149's yield. The yield is somewhat higher for Pu-239. Its neutron absorption cross section for thermal neutrons is high at 15200 barns, about 38% of samarium-149's absorption cross section, or about 20 times that of U-235.