Tissue distribution of131Ba post-IV injection. Two hours post-injection, 58% of the injected dose was recovered in the liver and lower percentages in the spleen, bone, bone marrow and the lungs. Over time, 131Ba levels in the liver and lungs decreased with accompanying increases in bone and bone marrow. Data are mean ± standard error of the mean, n = 5 per group. *P <0.05, decrease over time, #P <0.05, increase over time, MANOVA).