149Sm
149Sm is a stable isotope of the lanthanide element samarium (atomic number 62) with a mass number of 149. It is one of the naturally occurring isotopes of samarium and constitutes a notable fraction of natural samarium in minerals such as bastnasite and monazite.
Nuclear properties of 149Sm include its stability and very large cross-section for thermal neutron capture. While
Occurrence and production of 149Sm arise largely from natural samarium, where it exists as one of the
Applications and significance of 149Sm include its use as a burnable neutron absorber in certain nuclear fuel