The Radiation Protection course is assessable



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  • The Exam
  • The Radiation Protection course is assessable
  • Exam is on 15th October @ 10 am in Hunter Hall East
  • Resit exam (if required) is on 7th November @ 10 am in Randolph Hall
  • The exam paper is in two parts:
  • Part 1 – 10 multiple choice questions – total mark 40%
  • Part 2 – 3 written questions from a choice of 5 – total mark 60%
  • Pass mark is 50%
  • Becquerel
  • Henri
  • X
  • X
  • X
  • X
  • Add address:
  • IBLS – Graduate School
  • e.g. Davidson Bldg
  • GBRC
  • 1-10
  • 12
  • 13
  • 11
  • Sample paper
  • University of Glasgow
  • Radiation Protection Course Examination
  • You are allowed a maximum of 2 hours for the paper. Attempt all the questions in Part 1 and three
  • in Part 2. Where asked, try to be as concise as possible. Marks for each question are indicated in
  • brackets and the pass mark is 50%. Please note that this is a closed book examination, programmable
  • calculators and pocket computers are not allowed.
  • Part 1
  • 1. Thyroid monitoring for 125I internal contamination can be done using a:
  • a) Ion chamber
  • b) EP15 Geiger counter
  • c) Luxel optical luminescent dosimeter
  • d) Type 42 scintillation counter
  • 2. An unstable atom with too many protons can undergo which type of radioactive decay?
  • beta minus
  • beta plus
  • alpha
  • photoelectric effect
  • 3. What type and thickness of shielding is generally used for Sulphur 35
  • 1 mm lead
  • No shielding at all
  • 1 mm perspex
  • Concrete
  • 4. What is the preferred instrument for detecting 32P contamination?
  • Ion chamber
  • NaI scintillation probe
  • Geiger-Muller mini monitor
  • OSL dosimeter
  • 5. What is the radiation weighting factor for alpha radiation?
  • 1
  • 5
  • 10
  • 20
  • 6. What is the unit of absorbed dose?
  • Joule
  • Sievert
  • Gray
  • Becquerel
  • 7. Which of the following statements is not true for gamma radiation?
  • Gamma radiation will be stopped by a sufficient thickness of lead absorber
  • Gamma radiation interacts with matter through the Compton effect
  • Gamma radiation is a form of electromagnetic radiation
  • Gamma radiation originates in an excited nucleus
  • 8. The half-life of 125I is 60 days. Roughly, how long would you have to store 125I waste for its activity
  • to decay by a factor of 10?
  • 4 months
  • 5 months
  • 6 months
  • 7 months
  • 9. A chronic dose of radiation over a long period of time can give rise to a ‘stochastic’ effect. What is
  • meant by a stochastic effect?
  • The probability of a health effect above a threshold limit
  • The probability of a health effect with no threshold limit
  • The certainty of a health effect with no threshold limit
  • A known effect
  • 10. A skin dose from a beta emitter is considered more hazardous than that from a gamma emitter. Which
  • of the following best supports this statement?
  • Betas are not significantly attenuated by skin and thus cause more damage
  • Gammas are significantly attenuated by skin and thus cause more damage
  • All the beta’s energy is dissipated in the basal layers of the skin
  • All the gamma’s energy is dissipated in the basal layers of the skin
  • Section 1 answers: D, B, C, C, D, C, A, D, B, C
  • PART 2
  • ANSWER THREE QUESTIONS ONLY - 20 marks per question
  • 11 Write short notes on each of the following:
  • a) beta decay
  • b) electron capture
  • c) the Photoelectric effect
  • d) the Compton effect
  • 12 Describe how you would cope with a spillage of liquid radioactive material in the laboratory in order to control the potential hazard and clean up the area.
  • 13 Write short notes on the following:
  • a) absorbed dose
  • b) radiation weighting factor
  • c) equivalent dose
  • d) state the units of (a) and (c)
  • e) what are the current dose limits for a radiation worker?
  • 14 What is meant by
  • “controlled radiation area"
  • a ‘supervised radiation area’
  • a “system of work” and
  • ‘a permit to work’.
  • You are about to conduct an experiment in the laboratory for the first time using 32P. Write a risk assessment for the procedure detailing the five steps.
  • END OF PAPER
  • Part 2:
  • Each question is worth 20 marks
  • Answer 3 questions only
  • Short questions have 4/5 parts
  • Long (essay) questions, 1 mark for each relevant point raised
  • e.g.
  • 11 Write short notes on each of the following:
  • a) beta decay
  • b) electron capture
  • c) the Photoelectric effect
  • d) the Compton effect
  • A – There are 5 marks for each subquestion i.e. 5 points per question
  • Beta decay
  • 1 mark for noting there are two types
  • 1 mark for noting beta minus has excess neutrons and beta plus excess protons
  • 1 mark for noting neutron/proton is transformed into proton/neutron via WNF
  • 1 mark for noting ejection of high speed electron/positron to satisfy charge conservation
  • 1 mark for noting ejection of antineutrino/neutrino to satisfy conservation laws of e&am
  • b) Electron capture
  • 1 mark for noting nucleus has excess protons
  • 1 mark for noting inner electron is pulled into nucleus and combines with proton
  • 1 mark for noting that only emitted particle is a neutrino
  • 1 mark for noting space left in inner orbital is filled by an outer electron – emits characteristic X-ray
  • 1 mark for noting the nucleus is left ‘excited’ and emits gamma ray(s)
  • A11 - continued
  • c) Photoelectric effect
  • 1 mark for noting occurs for low energy em radiation – X-ray
  • 1 mark for noting PE is an absorption process
  • 1 mark for noting an inner shell electron is ejected and itself can cause further ionisations
  • 1 mark for noting that vacany is filled with higher shell electron and emission of a photon
  • 1 mark for correct diagram
  • d) Compton effect
  • 1 mark for noting occurs for higher energy em radiation – gamma
  • 1 mark for noting CE is an elastic collision process
  • 1 mark for noting an outer shell electron is ejected and itself can cause further ionisations
  • 1 mark for noting that the incoming gamma photon is scattered and has lower energy/different frequency
  • 1 mark for a correct diagram
  • 12 Describe how you would cope with a spillage of liquid radioactive material in the laboratory in order to control
  • the potential hazard and clean up the area.
  • A – 20 marks = 20 points to note
  • Don’t panic
  • Inform nearby workers of any spill
  • Treat yourself first
  • Check yourself for any contamination (include clothing)
  • Remove any contaminated clothing
  • Any skin contamination go to nearest wash facility and wash with soap and water – not Decon
  • If you have breathed in volatile isotopes (e.g. iodine) contact appropriate emergency services – local rules
  • Cordon off contaminated area using warning tape and signs
  • Use appropriate contamination monitor to detect the boundaries
  • If the spillage is large inform your DRPS immediately – if not available contact RPS
  • If the spillage is small try to contain using tissues soaked in Decon and working ‘out to in’
  • If spillage is on the floor use benchkote (matt side down) as a walkway
  • Work carefully to avoid spreading the contamination
  • Monitor yourself and clothing regularly
  • If isotope is short lived (e.g. Tc99m - 6 hr half-life) can shut down area and let the isotope decay
  • Wear suitable protective clothing
  • When decontaminating put all waste into radioactive bin
  • After decontamination recheck area again
  • Inform DRPS if not already done so
  • Fill in incident report
  • Review incident to determine what went wrong and how to correct


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