Click here to


Are you sure ?

Yes, do it No, cancel

Assembling Your Detector Toolkit - Which Types, How Many, and Why

B Muir1*, J Seuntjens2*, M McEwen3*, D Followill4*, W Culberson5*, S Davis6*, (1) National Research Council, Ottawa, ON, (2) McGill University, Montreal, QC, (3) National Research Council, Ottawa, ON, (4) UT MD Anderson Cancer Center, Houston, TX, (5) Univ of Wisc Madison, Madison, WI, (6) Miami Cancer Institute, Miami, FL


(Wednesday, 7/17/2019) 1:45 PM - 2:45 PM

Room: Stars at Night Ballroom 4

It is clear, just by reviewing the tables in TG-51, its Addendum and the AAPM/IAEA TRS-483, that the number of detectors available to the medical physicist has grown significantly over the last decade.

Cylindrical ion chambers are required for conventional linac photon beam output calibration. A correction for uniformity or use of a short reference-class chamber is required for flattening-filter free machines. Add in parallel-plate chambers for electron and hadron beams and a host of other detectors for small-field, relative dosimetry and other specialized applications and it can feel like you need a storeroom full of detectors to do your job properly. Wouldn’t it be great to just use one detector for everything?
However, it is also clear from a review of the literature that dosimetric mistakes are often made when physicists take established equipment and use them in non-standard situations without recognizing the limitations of operation. At the same time, protocols and QA programs require redundancy in equipment, so that a single failure will not lead to a major calibration problem. How do you best maintain traceability and robustness in your calibration of clinical radiation sources?

This symposium will attempt to a find a path through these competing requirements and identify methods of ensuring that a clinical medical physicist has the right equipment for their particular applications. The session will close with a panel discussion that will address the question, how many detectors are really required for adequate reference and relative dosimetry?

Learning Objectives:
1. Understand the issues and challenges of reference and relative dosimetry.
2. Identify best practices for beam output calibration.
3. Recognize the challenges of dosimetry in new technologies.



Not Applicable / None Entered.


Not Applicable / None Entered.

Contact Email