Question

170.7Li and "Be is an example of: a. isotopes b. isotones c. isobars d. isomers 171. The average number of ion pairs formed per unit path length traveled for any radiation is its: a. specific ionization b. linear energy transfer value c. energy to ionization ratio d. mass to charge quotient 172. If a person receives 25 rads of beta radiation, the person's absorbed dose in rem is: a. 25 b. 50 c. 250 d. 500 173. The dose rate of persantine administered during a radionuclide cardiac stress test is: a. 140 pg/kg/min b. 0.84 mg/kg c. 0.57 mg/kg over 4 minutes d. 0.57 mg/kg over 6 minutes 174. Which of the following 99m Tc radiopharmaceuticals can be used in the diagnosis of an acute MI: a. DTPA b. PYP C. HMDP d. DMSA 175. Reactor produced radionuclides are usually carrier-free and decay by: a. positron emission b. alpha c. isomeric transition d. beta 176. During a lung scan, the technologist notices multiple hot spots on the images. The most likely cause of this would be: a. pulmonary embolism b. too many particles injected c. patient movement during imaging d. improper injection technique

Answer 1

170. a. isotopes -7 li & 7 be are variants of lithium and beryllium with different no. of neutrons.

171. b. linear energy transfer value

Specific ionization is the number of ion pairs produced per unit track length.

Energy to ionization ratio is the ratio of the net charge by the electron to the shell number.

Mass to charge quotient -it is electron charge to mass quotient.

172. a. 25 ---RAD means Radiation Absorbed Dose.For equivalent dose,unit corresponding to rads is the rem.

173. c. 0.57 mg/kg over 4 minutes

174. c. H M D P (Hydroxymethylene Diphosphonate)

D T PA is for brain & kidney scanning

P Y P (pyro phosphate) used for serial scanning in cardiac amyloidosis.

D M S A(dimercaptosuccinic acid) for imaging inflammatory lesions.

175. d. beta

176. a. pulmonary embolism

In perfusion scan of the lungs,radioactive tracer is given which will be  evenly absorbed in the areas of good blood supply.Hot spots are the areas of the lungs,where the radioactive tracer accumulates in greater amount.