Mersey Radiation Dosimetry Flashcards by Asif Unknown

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Basic Radiation Biology

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Absorbed dose = energy deposited

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Radiation Dose

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Equivalent Dose

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[insert from movie]

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Radiation Dose Weighting Factors

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EFFECTIVE DOSE - measuring dose to ORGAN

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Calculating dose - by calculation only!

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[INSERT FROM MOVIE]

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Q

Tissue Weighting Factor

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Biological Effects of Ionising Radiation

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TISSUE REACTIONS

OLDER TERMINOLOGY: DETERMINISTIC EFFECTS

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Tissue reactions only occur above certain thresholds

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Q

Stochastic Effects

P() increase with dose but severity NOT dose dependant
Cancer induction main concern

Cancer risk: 1 in 20,000 for 1mSV exposure

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Stochastic Radiation Effects

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Risk of an unborn child

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Risks of antenatal exposure

= 1 in 13,000 per mSv

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Q

TYPICAL DOSES FOR MEDICAL EXPOSURES = MEMORISE THESE FOR EAXMS

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Q

External Radiation Protection

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Distance - Radiation is DIVERGENT

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It follows INVERSE SQUARE law

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Inverse square law also applies to scattered radiation

Also LEAKAGE radiation from x-ray tube

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Shielding

XRs or Gamma Rays
High Z materials like Tungsten or lead
Higher energies = need thicker shielding

Positron rays
Need plastic or glass
If you use metal - you’ll get XRAY production in the shield

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Q

Shielding in Radiology

Dose meter should be worn UNDERNEATH apron

DAMAGED PPE? INFORM RPS!

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Q

Radiation Dosemeters
Thermoluminescent - small crystals absorb ionisation radiation and emit light when exposed to heat

A bit like CR plates - are reuseable

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Contamination Monitoring

Probe has a scintillation crystal - detected by PM tube, no of gamma rays can be heard and seen on display

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PPE

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