[LO 0219] FEBRUARY 2019 Sub. Code: 1938
B.Sc. RADIOTHERAPY TECHNOLOGY
(New Syllabus 2014 2015)
THIRD YEAR
PAPER III QUALITY ASSURANCE, RADIOBIOLOGY AND
RADIATION SAFETY IN RADIOTHERAPY
Q.P. Code: 801938
Time: Three Hours Maximum: 100 Marks
Answer all questions
I. Elaborate on: x 10 30)
1. Describe the various components of medical linear accelerator unit.
Describe in detail about the quality assurance of high dose rate
brachytherapy unit.
2. Elaborate on various shutter mechanism used in telecobalt unit.
3. Elaborate on 5R's of Radiobiology and its significance in radiotherapy.
II. Write notes on: x 5 40)
1. Describe stochastic effects.
2. Write any three chromosomal aberrations with neat diagram.
3. Radiation weighting factors of ionizing radiations.
4. Relationship between kerma and absorbed dose.
5. Describe the emergency procedures during "source stuck" in telecobalt unit.
6. Explain the factors involved in the shielding calculation of radiation facility.
7. Principle and working of thimble chamber.
8. Explain the significance of laser in patient setup and necessary QA.
III. Short answers on: (10 x 3 30)
1. What are the factors considered to reduce the radiation exposure to a
radiation worker?
2. What is genetic effect?
3. Annual equivalent dose limit of eye lens and extremities for occupational
worker as per ICRP.
4. Define isocentre.
5. Fluence rate and its unit.
6. Define Exposure and its unit.
7. Contamination monitor.
8. What is ALARA?
9. What are leakage and scattered radiations?
10. Use of a survey meters in radiotherapy.