TY  - JOUR
T1  - The radioactivity of thorium dioxide sol: A preliminary report
AU  - TAFT RB
Y1  - 1937/05/22
N1  - 10.1001/jama.1937.02780210019005
JO  - Journal of the American Medical Association
SP  - 1779
EP  - 1781
VL  - 108
IS  - 21
N2  - The use of stabilized thorium dioxide sol (thorotrast) for roentgen visualization of the liver and spleen has become a well established clinical procedure, but the question of its radioactivity and the resultant effect on the reticulo-endothelial system is far from settled. The manufacturer places a warning in each box stating that the matter should be seriously considered.Many observers have asserted that the radioactivity of this preparation is negligible as it causes no fogging of a film in many hours' time, but this is far too crude a method of detecting small quantities of radiation.The Geiger counter.1 when brought in the vicinity of a sample of thorium dioxide sol, showed such violent and immediate response that I at once realized that I had a means of making observations of comparatively high accuracy. Though the instrument described is capable of making only gamma ray tests, it is substantial and
SN  - 0002-9955
M3  - doi: 10.1001/jama.1937.02780210019005
UR  - http://dx.doi.org/10.1001/jama.1937.02780210019005
ER  -