Table 7. S-values( mGy / MBq. s) for 177 Lu-DOTATATE & 90 Y-DOTATATE for BMI 34.5 of male ICRP phantom Source organs Target organs Kidney Spleen Liver Bladder Prostate Bladder 90 Y-DOTATATE 2.010e-05 ± 6.54e-06 1.616e-06 ± 5.61e-07 1.342e-05 ± 5.34e-06 3.521e-03 ± 7.12e-04 1.761e-05 ± 5.24e-06 177 Lu-DOTATATE 3.231e-08 ± 4.35e-09 7.845e-08 ± 1.73e-08 7.698e-08 ± 1.02e-08 7.381e-04 ± 3.12e-04 1.165e-07 ± 5.86e-08 Kidney 90 Y-DOTATATE 3.323e-03 ± 7.31e-04 1.432e-04 ± 7.23e-05 2.654e-05 ± 6.83e-06 9.923e-06 ± 1,54e-06 3.123e-04 ± 6.42e-05 177 Lu-DOTATATE 3.656e-04 ± 5.75e-05 2.280e06 ± 7.34e-07 1.132e-07 ± 7.23e-08 4.114e-08 ± 5.21e-09 4.673e-06 ± 7.34e-07 Spleen 90 Y-DOTATATE 3.204e-05 ± 6.31e-06 3.223e-05 ± 5.21e-06 1.745e-05 ± 5.45e-06 1.637e-06 ± 7.12e-07 2.523e-05 ± 4.54e-06 177 Lu-DOTATATE 2.829e-07 ± 6.40e-08 5.341e-07 ± 6.75e-08 2.282e-07 ± 8.21e-08 2.345e-09 ± 1.12e-09 9.113e-08 ± 1.31e-08 Liver 90 Y-DOTATATE 1.113e-04 ± 6.76e-05 9.623e-05 ± 1.04e-06 9.543e-05 ± 1.01e-05 1.056e-04 ± 5.89e-05 1.321e-04 ± 5.87e-05 177 Lu-DOTATATE 3.331e-06 ± 5.82e-07 8.431e-06 ± 1.02e-06 1.651e-06 ± 7.39e-07 1.845e-06 ± 5.98e-07 1.532e-06 ± 6.12e-07 Fig. 2. Relative differences between Lu-177( a) and Y-90( b) absorbed dose in different organs. 282 M. Jabari: Radioprotection 2025, 60( 3), 277 – 284