Question

62) 63) 64) The value for T. is IfT, -12 hrs and Tp- 6 hrs, then T.- IfT,-i2 days and Tb-6hrs, then T.-ーーーーーーーーーーーーーーー. Alpha and beta emitters should not be used in when the Tp is 6 hrs and T, is 2 hrs. 65) cause more tissue damage than gamma. radiopharmaceuticals because th A. Therapeutic B. Diagnostic 66) Gamma emitting radiolabels such as Te are useful for therapy because they are effective in causing radiation damage to abnormal cells. A. True B. False 67) An ideal radiopharmaceutical has A. B. C. D. E. a gamma energy between 30 and 300 KeV no particle emission high target organ to non-target organ activity ratio Both A and B All of the above 68) 99mTc-MAA is typically localized in the lung for perfusion imaging by A. active transport B. phagocytosis C. ion exchange D. capillary blockade 99mTc-Sulfur colloid is typically used to image what organ(s) A. liver B. spleen C. brain D. A & B Only E. A, B & C 9)

Answer 1

ANSWERS

   62) Value for Te, if Tp = 6 hrs and Tb = 2 hrs.

               FORMULA

                      Effective half life Te = TpTb / (Tb + Tp).

                      So       Te = 6*2 /(6 + 2)

                                      = 12 / 8

                                     = 1.5 hrs.

63) Value of Te, If Tp = 6 hrs. and Tb = 12 hrs.

                           Te = 6 *12 / (12 + 6 )

                                = 72 / 18

                                = 4 hrs.

64) Value of Te , If Tp =12 hrs and Tb = 6 hrs.

                          Te = 12*6 / (12 + 6)

                               = 72 / 18

                               = 4 hrs.

65). A. Alpha and Beta emitters should not be used in Therapeutic radiopharmaceuticals because they cause

           more damages than gamma.

66) B. False. Technetium - 99m is a isotope of technetium used only for diagnostic purpose as a radioactive

          tracer and it can detect in body by using gamma cameras.but not used in therapeutic purpose due to

          it's short half life of one day.

67) E. All of the above. an ideal radiopharmaceutical has gamma energy between 30 and 300 Kev,no particle

           emission and high target organ to non target organ activity ratio.

68).D.99m Tc - MAA is typically localized in the lung for perfusion imaging by Capillary blockade.

69).D. 99m Tc -Sulfur colloid is typically used to image Liver and spleen (A and B only).