radioisotope public under isotope 9 List Picture As a command %3 n0 radioisotope n2 plutonium-239 n0->n2 n3 cesium-137 n0->n3 n4 radiocarbon n0->n4 n5 radiochlorine n0->n5 n6 thorium-228 n0->n6 n7 tritium n0->n7 n1 isotope n1->n0