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mads.xsd"><authority><topic authority="http://roble.intecca.uned.es/tematres/lem/">Isótopos radiactivos</topic></authority><related type="narrower"><topic>Trazadores radiactivos</topic></related><related type="narrower"><topic>Tritio</topic></related><related type="narrower"><topic>Carbono 14</topic></related><related type="other"><topic>Medicina nuclear</topic></related><related type="other"><topic>Radiobiología</topic></related><related type="other"><topic>Substancias radiactivas</topic></related><related type="other"><topic>Radioquímica</topic></related><related type="other"><topic>Ingeniería nuclear</topic></related><related type="broader"><topic>Radiactividad</topic></related><related type="broader"><topic>Isótopos</topic></related><related type="broader"><topic>Sustancias radiactivas</topic></related><related type="broader"><topic>Química nuclear</topic></related><variant type="other"><topic>Radioelementos</topic></variant><variant type="other"><topic>Radioisótopos</topic></variant><variant type="other"><topic>Isótopos inestables</topic></variant><variant type="other"><topic>Radionucleídos</topic></variant> <note xml:lang="es"><![CDATA[ bajo los nombres de los distintos elementos y grupos de elementos químicos: Véase además los encabezamientos que empiezan por: y el subencabezamiento: Carbono-Isótopos; Isótopos; Isótopos radiactivos ]]></note></mads>