Patent ID: 8221520

Claim:
A process for producing thorium 228 from a natural thorium salt comprising thorium 232 and decay products of thorium 232 including radium 228, radium 224 and other decay products, comprising in succession: a) separating radium 228 and radium 224 from thorium 232 and the other decay products present in the salt, by at least one coprecipitating radium 228 and radium 224 by a barium sulphate, wherein said coprecipitating comprises: i) adding a sulphuric acid and a barium salt to an aqueous solution of said natural thorium salt in order to form a medium comprising a barium-(radium 228 and radium 224) sulphate coprecipitate and a supernatant, and ii) separating the coprecipitate from the supernatant; b) extracting from the coprecipitate thorium 228 coming from the decay of radium 228 thereby producing thorium 228.