Radioactivity

Question 1

A solid encapsulated radioactive source

Answer 1

is never to be touched directly with the hands; instead long tongs which add distance should be used.

Question 2

Any radioactive material that is attached to or associated with dust particles or in liquid form and is found on various surfaces is referred to as

Answer 2

radioactive contamination.

Question 3

Considering the design of the medical imaging suites listed below, which suite requires shielding for the highest energy photons?

Answer 3

PET-CT imaging suite

Question 4

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

Answer 4

250 mSv per event.

Question 5

Gamma rays differ from x-rays

Answer 5

only in the method of how they are produced.

Question 6

Iodine-125 (125I53) has been used quite extensively since 2000 in the form of titanium-encapsulated cylindrical seeds to give a tumoricidal radiation equivalent dose to

Answer 6

cancers that are confined within the prostate gland.

Question 7

Monoclonal antibodies (MAB) are antibodies that preferentially bind always to a specific

Answer 7

part of an antigen that is recognized by the antibody.

Question 8

The actual long-term health effects of a “dirty bomb” are likely to be

Answer 8

minimal.

Question 9

While a patient receiving Iodine-131 (131I53) therapy is hospitalized, a large, _________, movable lead shield can be positioned between the patient and any attending personnel for protection.

Answer 9

up to 25-mm or 1-inch-thick

Question 10

The isotopes used in brachytherapy are characterized by

Answer 10

relatively long half-lives that are measured in terms of multiple days, months, or years and, except for a few of them, by relatively high energy emissions.