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# Clinical Reference Dosimetry

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### Clinical Reference Dosimetry

1. 1. -  Vibha Chaswal (07-15-2008 – 09/11/2008)
2. 2.   The resident should gain an understanding of the accuracy and precision of each radiation measurement system, as well as its appropriate application.   Commissioning of Dose Measurement Systems           Commissioning of 3D Water Tank Ion chamber Dosimetry System Effects               Ion Chambers / Electrometers Film Metal Oxide Semiconductor Field Effect Transistor (MOSFET) Leakage Stem Effect Signal-to-noise for different chamber volumes Variation with bias level and polarity at different dose rates Variation with changes in water temperature Perform dose profile measurements with each detector and compare results. Manual Film Densitometry   H&D curve creation (10x10 field size, 6VM x-rays)     depths of 1.5 cm and 10 cm in solid water, EDR2 film and XV
3. 3.   Know dosimetric systems   Have a feel for numbers you see in any dosimetric calculations routinely in the clinic   Learn to design experiments to understand concepts   Assign applications to dosimeters – which one for which
4. 4.   Ion Chambers   Electrometers   MOSFET   Diodes   Films   Water tank (?)
5. 5.   Linearity   Stem effect   Polarity effect   Angular dependence   Collection Efficiency   Signal to Noise ratio b/w three ion chambers   nC/cc/cGy of cylindrical ion chambers
6. 6.   SNR b/w three electrometers   Leakage –   cable current (from IC cable alone and from IC cable and tri-axial cable together)   with and without connecting assembly to ion chambers
7. 7.   Linearity   Sensitivity or nominal response   Reproducibility   SSD/Instantaneous dose rate/pulse rate dependence   Temperature dependence   Field size dependence Missed out on: Angular dependence
8. 8.   Linearity   Sensitivity   Fading effect   Dose uncertainty   Entrance and exit doses vs PPC measured dose   Reproducibility
9. 9.   H and D curve for the XV film   H and D curve of the EDR film   Depth dependence of film   SNR and variance or response along a film, tested using XV film
10. 10.   Accuracy and precision of detector positioning   Reproducibility
11. 11.   Energy dependence   Dose rate dependence   Comparison of profiles and PDD by each   Photons vs Electrons   EDR films and Water tank
12. 12. CPE failure RE* imperfect CPE Perfect CPE •  CPE = concept permanently engraved •  Perfect CPE = inside the head dissipation of concept •  Imperfect CPE = over the head transmission of concept 0 1 2 3 4 5 6 7 8 Weekly interactions * No chargers produced initially, it is all a steady state bliss
13. 13. Thank you very much!