[Attempt at experimental demonstration of the biological activity of natural ionizing radiations].
D000818:Animals; D006128:Growth / Q000528:radiation effects*; D010247:Paramecium / Q000528:radiation effects*; D013910:Thorium / Q000494:pharmacology*
D013910:Thorium
Essai de démonstration expérimentale de lactivité biologique des radiations ionisantes naturelles.