quality assurance

Question 1

orthovoltage machines operate in the ____ range

Answer 1

150-500 kV

Question 2

neurons, chondrocytes, osteoblasts, and lymphocytes which has the highest radiosensitivity

Answer 2

osteoblasts

Question 3

the physical field size is defined as the __

Answer 3

50% isodose line

Question 4

when radiation interacts with radiographic film contained in a radiographic film badge, after development:

Answer 4

the film darkens proportional to the exposure

Question 5

which has the highest frequency? xrays, visible light, microwaves, radio waves

Answer 5

x-rays

Question 6

when shielding a linac vault where photon beam energies are greater than 10 MV …

Answer 6

shielding for neutron contamination must be taken into account

Question 7

which radioactive isotope is most commonly used in HDR after loading brachytherapy

Answer 7

Ir 192

Question 8

when a patient is treated with radioactive 131, the room should have a label that reads,

Answer 8

caution: radioactive materials

Question 9

the mathematical correction for the effect of temperature and pressure on ionization is based on a standardized barometric pressure of:

Answer 9

760 mmHg

Question 10

a pocket dosimeter is

Answer 10

a low energy dosimeter

Question 11

a traditional unit of absorbed dose equivalent is

Answer 11

rem

Question 12

which radiation interactions with matter occur independently of atomic number?

Answer 12

Compton effect

Question 13

what is the energy threshold for triplet production?

Answer 13

2.044 MV

Question 14

the si unit for absorbed dose is the gray while the traditional unit is the …

Answer 14

RAD!

Question 15

which element of the hematopoietic system shows the earliest response to radiation

Answer 15

lymphocytes

Question 16

how many volts are in a joule?

Answer 16

1= 1.6021 x 10 (^-19) J

Question 17

which proton interaction with matter involves direct photon interaction with the nucleus

Answer 17

pair production

Question 18

an area where radiation level could reach 60 mrem/ hr would be classified as

Answer 18

radiation area

Question 19

an example of a nonstochastic effect from radiation exposure is

Answer 19

erythema

Question 20

the patient experiencing dry desquamation should be advised to

Answer 20

apply radiation dermatitis ointments no sooner than 1 hour before treatment

Question 21

if the threshold energy of 1.022 MeV is not present for Beta+ decay to occur, then a nucleus with an excess number of protons will release energy by

Answer 21

electron capture

Question 22

brachial plexopathy is an adverse effect following the high dose radiation to the

Answer 22

supraclavicular fossa

Question 23

the radionuclide Tc99 is an example of a

Answer 23

isomer

Question 24

what is the approximate location of the external iliac lymph nodes?

Answer 24

1 cm lateral of the pelvic rim

Question 25

which of the following does not provide protection for the brain?

Answer 25

cerebellum

Question 26

it is important to detect a neoplasm early, when it is small, because smaller tumors show

Answer 26

fewer cells

Question 27

earlier generation therapy machines called orthovoltage machines operated in the range of

Answer 27

150 to 500 kV

Question 28

When radiation passes through matter, it may produce positively and negatively charged particles known as:

Answer 28

ions

Question 29

when treating the maxillary antrum, the organ at the greatest risk for damage is the

Answer 29

lens

Question 30

treatment should be withheld if

Answer 30

patient refuses, and unexpected side effects are reported

Question 31

in the maintenance phase of of managing ALL, whole brain irradiation may be given with the inferior border of the treatment field at the

Answer 31

C2

Question 32

For portal verification, bone tissue contrast is better using a kilovoltage imager rather than a megavoltage imager due to the absence of:

Answer 32

photoelectric interactions in the MV beam

Question 33

the most common type of leukemia in children is

Answer 33

ALL

Question 34

the amount of energy transferred in a medium per unit mass is referred to as

Answer 34

KERMA

Question 35

the primary function of area control activities, personnel monitoring, and proper radioactive material disposal is for the:

Answer 35

determination of appropriate ALARA procedures and process

Question 36

The class of cytotoxic agents that has the potential to burn the skin of the administerer is:

Answer 36

alkalizing agents

Question 37

the tail of the pancreas is at the

Answer 37

in the hilum of the spleen

Question 38

linear energy transfer is measured in

Answer 38

keV/micrometer

Question 39

electrons are liberated through a process called

Answer 39

thermionic emission

Question 40

the parathyroids are located

Answer 40

on the posterior surface of both thyroid lobes

Question 41

the maximum allowable transmission through the multi leaf collimators is

Answer 41

5%

Question 42

You have an emergency spinal cord compression at the level of lumbar spine 2. The physician orders a preliminary field to cover L1 to L3. The approximate field size will be:

Answer 42

8x10

Question 43

which tumor marker among the following is helpful in the diagnosis of testicular cancer

Answer 43

alpha fetoprotein

Question 44

with all other factors remaining the same, increasing the field size from 6x6 to 10x10 would

Answer 44

increase - delete this question