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Determination of Absorbed dose • Absorbed dose to water
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• Corrections for Influence quantities
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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!
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Pk PT
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!
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.
Other numbers!Salaries Vs Experience
0
20
40
60
80
100
120
0 5 10 15 20 25
Years experience
Sal
ary
$k
Others states do better …
• NSW has been much more effective at setting conditions• We want what they’ve got!
$40,000
$60,000
$80,000
$100,000
$120,000
$140,000
$160,000
$180,000
$200,000
MeS
3 (1
-2)
MeS
3 (3
)
MeS
4 (1
-2)
MeS
4 (3
)
MeS
4 (4
)
MeS
5 (1
)
MeS
5 (2
)
MeS
5 (3
)
MeS
5 (3
)
MeS
5 (3
)
MeS
5 (3
)
Relative to SA Medical Scientist MeS Levels (brackets indicate increments)
Rat
e o
f P
ay (
per
an
nu
m)
NSW Accrediated
NSW Non-Accrediated
SA with A&R Allowance
SA without A&R Allowance
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
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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