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RADIATION PROTECTION IN RADIOTHERAPY

RADIATION PROTECTION IN RADIOTHERAPY. IAEA Training Material on Radiation Protection in Radiotherapy. Part 2: Radiation Physics PRACTICAL EXERCISE. Objectives. To be familiar with different types of ionizing radiation

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RADIATION PROTECTION IN RADIOTHERAPY

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  1. RADIATION PROTECTION IN RADIOTHERAPY IAEA Training Material on Radiation Protection in Radiotherapy Part 2: Radiation Physics PRACTICAL EXERCISE

  2. Objectives • To be familiar with different types of ionizing radiation • To understand the most important interaction processes between radiation and matter • To be able to use and understand all basic radiation quantities • To have a basic understanding of the means of radiation detection Part 2, Practical 1

  3. Part 2: Radiation Physics IAEA Training Material on Radiation Protection in Radiotherapy Practical 1: Inverse square law

  4. Contents + Objective • Learn about the importance of distance as a means to reduce radiation exposure • Perform an experiment to demonstrate this Part 2, Practical 1

  5. What Minimum Equipment is Needed? • Radiation source • Radiation detector • Tape distance measure • Graph paper Part 2, Practical 1

  6. Radiation source • Ideal a 60-Co source for teaching (activity <100kBq) • Should be high energy gamma to minimize attenuation • Some experiments can also be performed with brachytherapy source Part 2, Practical 1

  7. Radiation detector • Best a Geiger counter with window thick enough to be mostly sensitive to gamma radiation • A survey meter may also be suitable Part 2, Practical 1

  8. Record readings at different distances detector source distance Part 2, Practical 1

  9. Record and plot data Part 2, Practical 1

  10. Important consequences • Distance is a powerful way to reduce exposure • Practical implications in radiotherapy: • use long tweezers to handle sources in brachytherapy • a long maze can reduce shielding requirements for doors significantly Part 2, Practical 1

  11. Acknowledgement Photos from Leybold-Didaktik web page: www.leybold.de Part 2, Practical 1

  12. Questions? Let’s get started... Part 2, Practical 1

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