The longest-lived isotope of the element radium has a half life of only 1,600 years, which means that it is highly radioactive. It was once used as an ingredient in luminous paint for watch hands and aircraft instrument dials.
Antique watch hand in sealed ampoule, embedded inside 7ml glass vial with element symbol, Ra, engraved on lid
size: 45mm x 20mm
total weight -
price: £30 ex. shipping