Question : 41) The half-life of bromine-74 25 min. How much of : 1362907

 

41) The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample is still active after 75 min? 

A) 0.50 mg

B) 1.0 mg

C) 2.0 mg

D) 0.25 mg

E) 4.0 mg

42) When an atom of uranium-235 is bombarded with neutrons, it splits into smaller nuclei and produces a great amount of energy. This nuclear process is called 

A) fission.

B) fusion.

C) decomposition.

D) chain reaction.

E) ionization.

43) In the sun, nuclei of hydrogen combine to form a larger nucleus and release a great amount of energy.  The process is known as 

A) fission.

B) fusion.

C) metathesis.

D) chain reaction.

E) ionization.

44) When a positron is emitted from the nucleus of an atom, the nuclear mass

A) increases by two units.

B) decreases by one unit.

C) increases by one unit.

D) decreases by two units.

E) remains the same.

45) When an alpha particle is emitted from the nucleus of an atom, the nuclear mass

A) increases by two units.

B) decreases by four units.

C) increases by one unit.

D) decreases by two units.

E) remains the same.

46) When a gamma ray is emitted from the nucleus of an atom, the nuclear mass

A) increases by two units.

B) decreases by one unit.

C) increases by one unit.

D) decreases by two units.

E) remains the same.

47) Gamma rays may be detected using

A) a Geiger counter.

B) a film badge.

C) X-ray film.

D) all of the above devices.

E) none of the above devices.

48) Gamma rays require the heaviest shielding of all the common types of nuclear radiation because gamma rays have the 

A) highest energy.

B) most intense color.

C) lowest energy.

D) largest particles.

E) heaviest particles.

49) If absorbed internally, alpha particle emitters are the most damaging because alpha particles

A) have the largest charge.

B) have the greatest energy.

C) have the greatest mass.

D) consist of high energy electrons.

E) consist of pure energy.

50) Radium-226 decays by alpha emission to

A) barium-131.

B) cobalt-60.

C) carbon-14.

D) polonium-218.

E) radon-222.

51) Iodine-131 decays by beta emission to

A) iodine-132.

B) tellurium-131.

C) iodine-130

D) bromine-131

E) xenon-131.

52) A sample of cerium-141 for a diagnostic test was dissolved in saline solution to an activity of 4.5 millicuries/mL. If the patient undergoing the test needs a dose of 10 millicuries, how much of the solution should be injected into the patient?

A) 45 mL

B) 0.45 mL

C) 2.2 mL

D) 22 mL

E) 4.5 mL

53) The most widely used medical isotope in nuclear medicine is

A) Tc-99m.

B) I-131.

C) P-32.

D) I-125.

E) Co-60.

54) The recommended dosage of I-131 for a test is 4.2 microcuries per kg of body weight. How many millicuries should be given to a 55 kg patient? (1 mCi = 1000 μCi)

A) 230 millicuries

B) 0.23 millicuries

C) 0.076 millicuries

D) 760 millicuries

E) 13.8 millicuries

55) One symptom of mild radiation sickness is

A) a lowered white cell count.

B) a raised white cell count.

C) a lowered red blood cell count.

D) a raised red blood cell count.

E) a white cell count of zero.