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Radiotherapy Quiz

Total questions: 51

Worksheet time: 26mins

Name
Class
Date
1.

Radiotherapy is primarily used for the treatment of

a)

Infectious diseases

b)

Cancer

c)

Diabetes

d)

Hypertension

2.

Orthovoltage therapy operates typically in the energy range of

a)

10–100 kVp

b)

100–500 kVp

c)

200–500 kVp

d)

1–10 MV

3.

The main radiation used in teletherapy is

a)

Alpha rays

b)

Beta rays

c)

Gamma rays

d)

Neutrons

4.

Cobalt-60 emits which type of radiation?

a)

Alpha

b)

Beta

c)

Gamma

d)

X-rays

5.

The half-life of Cobalt-60 is approximately

a)

2.6 years

b)

5.3 years

c)

10 years

d)

15 years

6.

The gamma energy of Cobalt-60 is

a)

0.662 MeV

b)

1.17 & 1.33 MeV

c)

2.2 MeV

d)

5 MeV

7.

Orthovoltage X-ray tubes are cooled by

a)

Water

b)

Air

c)

Oil

d)

Helium

8.

The purpose of interlocks in radiotherapy equipment is to

a)

Reduce patient anxiety

b)

Prevent accidental exposure

c)

Increase radiation output

d)

Calibrate dose

9.

The housing of a Cobalt-60 source is made of

a)

Lead

b)

Aluminum

c)

Stainless steel

d)

Plastic

10.

Handling of Cobalt-60 source requires

a)

Manual contact

b)

Remote handling tools

c)

Bare hands

d)

None

11.

Linear accelerator (LINAC) generates

a)

Alpha particles

b)

Neutrons

c)

High-energy X-rays or electrons

d)

Beta rays

12.

The accelerating structure in a LINAC is called

a)

Cathode

b)

Anode

c)

Waveguide

d)

Target

13.

The klystron in LINAC acts as a

a)

Amplifier

b)

Oscillator

c)

Modulator

d)

Reflector

14.

Magnetron is used as a

a)

Radiation detector

b)

Microwave generator

c)

Ion source

d)

Cooling device

15.

The bending magnet in a LINAC is used to

a)

Cool electrons

b)

Direct beam to patient

c)

Bend the electron beam

d)

Measure beam energy

16.

The target in LINAC converts

a)

Electrons to photons

b)

Photons to electrons

c)

Neutrons to protons

d)

Gamma to X-rays

17.

The primary collimator in LINAC is used for

a)

Beam focusing

b)

Beam hardening

c)

Beam shaping

d)

Beam alignment

18.

Radio-frequency (RF) power in LINAC is generated by

a)

Klystron or Magnetron

b)

Transformer

c)

Cathode

d)

Photomultiplier

19.

Remote after-loading systems are primarily used in

a)

Teletherapy

b)

Brachytherapy

c)

Diagnostic imaging

d)

Radiation protection

20.

In after-loading, the radioactive source is

a)

Loaded manually

b)

Loaded remotely after applicator placement

c)

Placed before applicator

d)

None

21.

Styrofoam template cutting systems are used in

a)

Radiography

b)

Treatment planning

c)

Patient immobilization

d)

Dosimetry

22.

Gamma knife is used in

a)

Orthopedic surgery

b)

Radio-surgery

c)

Nuclear medicine

d)

Radiography

23.

Radio-surgery is primarily used for

a)

Skin cancer

b)

Brain lesions

c)

Bone tumors

d)

Thyroid cancer

24.

Dosimeter equipment measures

a)

Time

b)

Radiation dose

c)

Energy

d)

Pressure

25.

TLD stands for

a)

Thermoluminescent Dosimeter

b)

Thermal Light Detector

c)

Total Luminescence Device

d)

Time Light Dosimeter

26.

EBRT stands for

a)

External Beam Radiotherapy

b)

Electron Beam Radiation Treatment

c)

Extra Beam Radiology Therapy

d)

External Biological Radiation Therapy

27.

IMRT stands for

a)

Intensity-Modulated Radiation Therapy

b)

Integrated Medical Radiation Treatment

c)

Internal Multi Radiation Therapy

d)

Isometric Modulated Radiation Therapy

28.

VMAT stands for

a)

Variable Mode Arc Therapy

b)

Volumetric Modulated Arc Therapy

c)

Volumetric Medical Arc Treatment

d)

Vector Modulated Arc Therapy

29.

LINAC is used in which type of radiotherapy?

a)

Brachytherapy

b)

EBRT

c)

Systemic therapy

d)

Phototherapy

30.

Immobilization devices are used to

a)

Deliver drugs

b)

Prevent patient movement

c)

Increase dose rate

d)

Adjust beam energy

31.

The treatment shell in radiotherapy is usually made of

a)

Lead

b)

Thermoplastic

c)

Aluminum

d)

Rubber

32.

Immobilization devices improve

a)

Comfort only

b)

Reproducibility and accuracy

c)

Dose rate

d)

Equipment cooling

33.

Patient setup accuracy in radiotherapy is checked using

a)

MRI

b)

CT

c)

Simulator

d)

Ultrasound

34.

Acceptance testing ensures

a)

Equipment aesthetic

b)

Equipment safety and performance

c)

Faster treatment

d)

None

35.

Tele-isotope machines use

a)

Beta rays

b)

Gamma rays

c)

X-rays

d)

Neutrons

36.

Megavoltage therapy uses photon energies above

a)

100 keV

b)

500 keV

c)

1 MeV

d)

10 MeV

37.

The source housing of telecobalt units contains

a)

Lead shielding

b)

Aluminum filter

c)

Copper window

d)

Iron jacket

38.

The function of beam flattening filter in LINAC is to

a)

Increase beam intensity

b)

Make beam uniform

c)

Reduce energy

d)

Shape beam edges

39.

The flattening filter is placed

a)

Before target

b)

After target

c)

Before bending magnet

d)

Before waveguide

40.

A dosimeter worn by staff is called

a)

Pocket dosimeter

b)

Survey meter

c)

Area monitor

d)

Phantom

41.

The purpose of quality assurance (QA) in radiotherapy is to

a)

Improve comfort

b)

Ensure accurate dose delivery

c)

Reduce staff

d)

Increase exposure

42.

The head of LINAC contains

a)

Waveguide

b)

Bending magnet and collimator

c)

Klystron

d)

Vacuum pump

43.

Brachytherapy involves

a)

External source

b)

Internal placement of radioactive sources

c)

Use of electron beam

d)

None

44.

The purpose of source drawer in cobalt unit is

a)

Cooling

b)

Source movement control

c)

Collimation

d)

Position marking

45.

A phantom is used for

a)

Patient comfort

b)

Dose calibration

c)

Beam alignment

d)

Simulation

46.

Acceptance test on LINAC is performed

a)

Once a year

b)

Before clinical use

c)

Monthly

d)

Never

47.

Beam symmetry is checked using

a)

Ion chamber

b)

Film dosimetry

c)

TLD

d)

All of the above

48.

The energy of orthovoltage X-rays is best suited for treating

a)

Deep tumors

b)

Superficial tumors

c)

Bone metastasis

d)

Brain lesions

49.

The most common isotope used in brachytherapy is

a)

Iodine-131

b)

Iridium-192

c)

Cesium-137

d)

Cobalt-60

50.

The radiation beam from LINAC is controlled by

a)

Collimator jaws

b)

Bending magnet

c)

Waveguide

d)

Target

51.

The primary advantage of IMRT is

a)

Faster treatment

b)

Improved dose conformity

c)

Less planning time

d)

None

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