Chapter 14 Quiz

Question 1

remote afterloading techniques were developed primarily to reduce

Answer 1

exposure to personnel

Question 2

the most commonly used isotopes for permanent implants are

Answer 2

I-125 and Pd-103

Question 3

which of the following are used to seal radioactive sources

Answer 3

plastic, titanium, and stainless steel

Question 4

the dose absorbed in tissue ______ when the distance from the brachytherapy source increases

Answer 4

decreases

Question 5

what is the half life of I-125

Answer 5

59.4 days

Question 6

what is the half life of gold-198

Answer 6

2.7 days

Question 7

what is the half life of radium-226

Answer 7

1622 yrs

Question 8

what is the half life of cobolt-60

Answer 8

5.27 yrs

Question 9

what is the half life of cesium-137

Answer 9

30 yrs

Question 10

what is the half life of iridium-192

Answer 10

73.83 days

Question 11

what is the half life of palladium-103

Answer 11

17 days

Question 12

what is the half life of strontium-90

Answer 12

28.9 yrs

Question 13

what is the half life of ruthenium-106

Answer 13

367 days

Question 14

photons emitted from sources in the high-energy group interact with matter primarily via ________ while souces in the low-energy group interact with matter primarily via _________

Answer 14

compton scatter, photoelectric absorption

Question 15

a minimum dose rate greater than _____ is required for a brachytherapy treatment to be considered HDR

Answer 15

12 Gy/hr

Question 16

T/F: the physician must be present during HDR treatment

Answer 16

true

Question 17

tandem and ovoids are used in a brachytherapy procedure for which type of cancer

Answer 17

cervical