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Measuring dose

Measuring dose. Ionisation chamber. Ionization Chambers. 600cc chamber. Thimble chambers. Determination of Absorbed dose. Absorbed dose to water. Corrections for Influence quantities. Corrections. Accurate dosimetry requires many small corrections E.G. Temperature/Pressure

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Measuring dose

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  1. Measuring dose Ionisation chamber

  2. Ionization Chambers 600cc chamber Thimble chambers

  3. Determination of Absorbed dose • Absorbed dose to water • Corrections for Influence quantities

  4. Corrections • Accurate dosimetry requires many small corrections • E.G. Temperature/Pressure • Ionisation charge collected depends on amount of air in chamber • Correct by • Other corrections for chamber characteristics • Recombination, polarity effects • Complex business, keeps us in work!

  5. Medical Physics as a career

  6. Training • Minimum honours degree in physics • Training process follows • Employed as “registrar” in a radiotherapy department • Masters or Doctorate will be completed during this time • Five years hospital experience • After five years, accreditation exams • Three hour written exam • Half day practical exam • Oral exam • Most recover, with counselling!

  7. Some of the staff

  8. Physicist numbers • There are 268 ROMPs in Australia employed at ~50 sites • There is a mild shortage of ROMPs • 14% positions unfilled in Australia • Many vacancies are filled from overseas • Very international flavour to most departments • Peter MacCallum Cancer Centre is one of Australia’s largest employers of ROMPs with 18 staff, including 3 registrars.

  9. Other numbers!

  10. Others states do better … • NSW has been much more effective at setting conditions • We want what they’ve got!

  11. Roles within Peter Mac • Radiation protection • Targeting lowest possible occupational doses • Dosimetry • Checking output against national laboratory standards • Brachytherapy • Clinical work treating patients using radioactive sources • Teaching/lecturing • Medical registrars • Quality assurance • After hours work checking machine outputs and alignments • Research • Many clinical projects trialling new approaches to treatment • Development towards improved treatment • Application of new technology

  12. Physicists at work

  13. Physicists at work

  14. Physicists at work

  15. Working conditions:

  16. So, what else do we do? • About 50% (+/-30%!) of our time is unscheduled • Most work is project based and open ended • Most physicists have a specialty and pursue a project in that area • My interest is in setup correction • Study of position accuracy for patients on treatment • New imaging tools have become available • New treatment techniques

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