Question

129. Which of the following radioactive gases can be used for a lung ventilation study: 1. xenon 2. krypton 3. radon a. 1 only b. 1 and 2 only c. 2 and 3 only d. 1, 2 and 3 Bm 130. A repeat of the thyroid uptake test following the administration of 10 units of TSH may be used in a patient who is: a. hyperthyroid b. hypothyroid c. euthyroid d. athyroid 131. A 330 mCi 99Mo/99m Tc generator is calibrated for 12 Noon on Thursday, August 24. How many mCi of 99Mo would be present in the generator at 8 am on Wednesday, August 23. (The post decay factor for 99Mo for 28 hours is 0.745.): a. 19 b. 225 c. 443 d. 4800 132. Setting the PHA window on a gamma camera system selects the gamma energy pulse that will be sent to the: a. detector b. pre-amp C. PMT d. oscilloscope 133. Which of the following statements is (are) true concerning a scintillation spectrometer: 1. The current and voltage pulses produced at the collecting plate of the PMT will be proportional to the number of electrons produced by the photocathode. 2. The number of electrons produced at the photocathode of the PMT is proportional to the amount of light produced in the crystal. 3. The amount of light produced in the crystal is proportional to the amount of energy deposited in the crystal by the incident gamma. a. 1 and 2 only b. 1 and 3 only c. 2 and 3 only

Answer 1

0 b) 1 and 2 only Xenon and Krypton is used for lung ventilation study. But radon is not used for ventilation. Long exposure to radon caused lung cancer as it lodge the lung lining and cause cell damage that leads to lung cancer. @ TSH normal level is o.4 to 4:0 units B Hypothyroid. A value above normal level indicates under - active thyroid cohich indicates hypothyroidism C 443 I 443 mci of " Mo would be present in the generator at 8 am on Wednesday. Aug 23. © A) Detector The gamma energy pulse will be sent into detector: * B) land 3 only. PMT coill be proposional to the electrons produced by the photocathode. 1 The right produced in crystal is proportion to I the energy deposited in the crystal by the incident gammal