<page_title> Protactinium </page_title> <section_title> Precautions </section_title> <table> <cell> 231Pa <row_header> Isotope </row_header> </cell> <cell> 0.048 <row_header> SA (Ci/g) </row_header> </cell> <cell> α <row_header> Decay </row_header> </cell> </table>
Protactinium isotope ²³¹Pa has a specific activity of 0.048 Ci per gram and emits alpha-particles.