Radiation interactions and effects

Question 1

Which effect is most likely to occur in a patient who receives a very small dose of radiation?

Answer 1

Cancer

Question 2

Deterministic effects of radiation exposure include which of the following

Answer 2

1. Skin erythema
2. Epilation
3. miscarriage

Question 3

air kerma is measured in unit of:

Answer 3

miligram (mGy)

Question 4

concerning radiation-induced cancer, increasing the radiation dose to a patient results in:

Answer 4

increase probability of cancer

Question 5

Which two of following radiation effects only occur at a specific dose theshold?

Answer 5

1. cataracts

2. skin erythema

Question 6

the number of ionization events in air is described as :

Answer 6

exposure

Question 7

Consider this scenario: during a CT scan of the chest, the technologist administers a radiation dose of approximately 3,000 (mGy). which two of following effects may occur?

Answer 7

1. epilation

2. cancer

Question 8

Which two of the following interactions may result in an x-ray photon being emitted out of the patient in a different direction than the original path?

Answer 8

1. coherent scattering

2. Compton scattering

Question 9

Increasing the kilovoltage peak (kVp) for a CT procedure result in:

Answer 9

decreased attenuation

Question 10

During a CT procedure, attenuation of the x-ray beam may be caused by which three of the following?

Answer 10

1. coherent scattering
2. Compton scattering
3. photoelectric absorption

Question 11

effective dose is measured with unit of:

Answer 11

(mSv)

Question 12

Which of the following dose quantities is most useful for projecting the risk of radiation induced cancer?

Answer 12

effective dose

Question 13

the energy of ions created in air from x-ray is called:

Answer 13

air kerma

Question 14

equivalent dose is described with unit of:

Answer 14

(mSv)

Question 15

What term describes radiation induced hair loss

Answer 15

epilation

Question 16

radiation exposure is calculated with unit of:

Answer 16

(c/kg)

Question 17

what of these radiation measurements describe the joules of energy deposited in the patient from ionizing radation

Answer 17

absorbed dose

Question 18

an increased patient size has what of the following effects on x ray attenuation

Answer 18

increased attenuation

Question 19

scanning an area of increased tissue density will result in

Answer 19

increased x ray attenuation

Question 20

for deterministic effects of radiation, increasing dose results in

Answer 20

increased severity of the effect

Question 21

which of the following materials will result in the highest x-ray transmission reading?

Answer 21

air

Question 22

which of these radiation interactions do not result in ionization of an atom

Answer 22

coherent scattering