Deck 14: Radioisotopes and Radiation Protection

Question 1

What is the half-life of Technetium-99m?

A) 6 hours
B) 3 hours
C) 6 minutes
D) 3 minutes

Answer 1

6 hours

Question 2

Considering the design of the medical imaging suites listed below,which suite presents the most unique additional radiation safety problems?

A) Computer radiography suite
B) PET and CT imaging suite
C) Digital mammography suite
D) Digital fluoroscopy suite

Answer 2

PET and CT imaging suite

Question 3

During a radiation emergency,at a dose rate of ____________,emergency personnel should await specific instructions from radiation experts on how to proceed.

A) 0.1 Sv/hr
B) 0.5 Sv/hr
C) 1.0 Sv/hr
D) 5.0 Sv/hr

Answer 3

0.1 Sv/hr

Question 4

Tellurium-125 (¹²⁵Te) has:

A) 125 protons and 125 neutrons.
B) 75 protons and 63 neutrons.
C) 52 protons and 73 neutrons.
D) 45 protons and 58 neutrons.

Question 5

Therapeutic radioisotopes are characterized by:

A) very short half-lives.
B) half-lives that are exactly the same.
C) relatively long half-lives.
D) half-lives that remain constant for all eternity.

Question 6

While a patient receiving Iodine-131 (¹³¹I) therapy is hospitalized,a large,_________,rolling lead shield can be positioned between the patient and any attending personnel for protection.

A) up to 1-inch-thick
B) 2-inch-thick
C) 3-inch-thick
D) 6-inch-thick

Question 7

In __________,a neutron transforms itself into a combination of a proton and an energetic electron.

A) alpha decay
B) beta decay
C) gamma decay
D) x-ray absorption

Question 8

During a radiation emergency,the dose limit for individuals engaging in lifesaving activities is:

A) 50 mSv per event.
B) 100 mSv per event.
C) 250 mSv per event.
D) 500 mSv per event.

Question 9

Diagnostic techniques in nuclear medicine typically make use of ___________ radioisotopes as radioactive tracers.

A) long-lived
B) short-lived
C) very weak
D) potentially lethal

Question 10

The design of a _______________ imaging suite involves significant radiation safety concerns.

A) diagnostic x-ray
B) computed radiography
C) computed tomography
D) PET and CT

Question 11

Iodine-125 (¹²⁵I) in the form of titanium-encapsulated cylindrical seeds has been used quite extensively within the past decade to give a tumoricidal radiation equivalent dose for:

A) malignant brain tumors.
B) malignant breast tumors.
C) malignant lung tumors.
D) prostate cancers that are confined within the prostate gland.

Question 12

Each Fluorine-18 (¹⁸F) nuclear transformation by positron decay yields two highly penetrating _________ photons.

A) 250-keV
B) 472-keV
C) 511-kev
D) 777-keV

Question 13

The actual long-term health effects of a "dirty bomb" are likely to be:

A) catastrophic.
B) maximal.
C) minimal.
D) nonexistent.

Question 14

If enough explosives are used to spread radioactive material over a broad area,then radioactivity is:

A) extremely hazardous and may be much higher than background levels.
B) moderately hazardous and may be higher than background levels.
C) slightly hazardous and may be only slightly higher than background levels.
D) diluted and may not be much higher than background levels.

Question 15

Radioactive material that is attached to or associated with dust particles or in liquid form on various surfaces defines the term:

A) radioactive contamination.
B) radioactive dispersal device.
C) radioactive fallout.
D) radioactive syndrome.