(1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u).

Für jedes Radionuklid gibt es im menschlichen Körper eine Hauptablagerungsstätte, an der ein größerer Prozentsatz des resorbierten Materials gespeichert wird. Für das Radium 226 ist es wie für andere Erdalkalimetalle der Knochen. Radium 226 ist ein radioaktives Element, das zu den hochgiftigen Substanzen gehört.

Radium (88 Ra) has no stable or nearly stable isotopes, and thus a standard atomic weight …

Weights of atoms and isotopes are from NIST article. A comparison of bone tumor types in the radium-224 patients and bone sarcoma after incorporation of radium-226 and radium-228 and external irradiation and in tumors arising at sites of pre-existing bone lesions showed the same spectrum of tumors. The high incidence of bone tumors of the fibroblastic and fibrohistiocytic type was observed in all these secondary bone sarcomas.