decay factor; decay coefficient; attenuation constant

balance of radium and uranium

balance of uranium and radium

certificate of radium content

curvature radium

distal end fracture of radium

Disused Radium Source

effective radium content

eka radium

equivalent radium content

estimated actual radium analyzer

estimated actual radium content

first isolation of radium

heating effect of radium

international radium standard

ionium-radium geochronology

iris radium

Limit infinitesimal radium

Liquid Radium Source