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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

RADIATION PROTECTION IN RADIOTHERAPY

IAEA Training Material on Radiation Protection in Radiotherapy

Part 2: Radiation Physics

PRACTICAL EXERCISE

objectives
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

part 2 radiation physics

Part 2: Radiation Physics

IAEA Training Material on Radiation Protection in Radiotherapy

Practical 1: Inverse square law

contents objective
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

what minimum equipment is needed
What Minimum Equipment is Needed?
  • Radiation source
  • Radiation detector
  • Tape distance measure
  • Graph paper

Part 2, Practical 1

radiation source
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

radiation detector
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

record readings at different distances
Record readings at different distances

detector

source

distance

Part 2, Practical 1

record and plot data
Record and plot data

Part 2, Practical 1

important consequences
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

acknowledgement
Acknowledgement

Photos from Leybold-Didaktik web page: www.leybold.de

Part 2, Practical 1

questions
Questions?

Let’s get started...

Part 2, Practical 1