<prompt> For shield mould in eye tumors which of the following is preferred?Iodine-131Gold-198Strontium-90Phosphorous-32  <response>: Ans. D. Phosphorous-32Some useful radionuclides used in clinical radiotherapyRadionuclideEnergy Half-life Medical uses Radium-2260.83mv1625 yearsfor brachytherapy but not used now a days Cobalt-601.25mv5.4 yearsteletherapy brachytherapy Caesium-1370.666mv30 yearsteletherapy brachytherapy Iridium-1920.380mv72 daysbrachytherapy only Iodine-1250.030mv60 daysbrachytherapy Iodine-1310.61mv8 daysunsealed radioiodine for thyroid cancer Rx Gold-1980.412mv 2.7 days brachytherapy Strontium-902.24mv30 yearsfor shield mould in eye tumors Phosphorous-321.71mv14 daysintraperitoneal 