Scientific Calendar Event



Description
The aim of this Workshop is to familiarize physicists, working in radiation dosimetry laboratories or lecturers teaching radiation dosimetry, with procedures and methodologies that should be utilized for the determination of uncertainties in medical radiation dosimetry. 
Contrary to earlier practice, when the terms error and uncertainty were used interchangeably, the modern approach distinguishes between these two concepts. Traditionally, an error has been viewed as having two components, namely a random component and a systematic component. According to present definitions, an error is the difference between a measured value and the true value. If errors were known exactly, the true value could be determined; in reality, errors are estimated in the best possible way and corrections are made for them. Therefore, after application of all known corrections, errors do not need any further consideration and the quantities of interest are uncertainties. An error has both a numerical value and a sign. In contrast, the uncertainty associated with a measurement is a parameter that characterizes the dispersion of the values “that could reasonably be attributed to the measurand”. 
This parameter is normally an estimated standard deviation. An uncertainty, therefore, has no known sign and is usually assumed to be symmetrical. It is “a measure” of our lack of exact knowledge, after all recognized systematic effects have been taken into count by applying appropriate corrections.
Uncertainties of measurements are expressed as relative standard uncertainties and the evaluation of standard uncertainties is classified into type A and type B. The method of evaluation of type A standard uncertainties is by statistical analysis of a series of observations, whereas the method of evaluation of type B standard uncertainties is based on means other than statistical analysis of a series of observations.
The IAEA, understanding the need to provide practical guidance on the estimation of measurement uncertainty in dosimetry, has incorporated a specific section on this topic in relevant publications on radiation dosimetry, such as the IAEA TRS-398 (Absorbed Dose Determination in External-Beam Radiotherapy An-International Code of Practice for Dosimetry Based on Standards of Absorbed dose toWater), IAEA TRS-454 (Quality Assurance for Radioactivity Measurement in Nuclear Medicine), IAEA TRS-457 (Dosimetry in Diagnostic Radiology: An International Code of Practice) and IAEA TEC DOC-1585 Measurement Uncertainty: A Practical Guide for Secondary-Standards Dosimetry Laboratories). 
Go to day
  • Monday, 9 June 2014
    • 08:30 - 17:00
      • 08:30 Registration and Administrative Formalities (Main Entrance - Leonardo da Vinci Building) 1h30' ( Leonardo da Vinci Building, Lobby )
        All participants should register in the Main Entrance Lobby of the Leonardo da Vinci Building.
      • 10:00 Opening 30'
        Objectives of the Workshop, Introduction of participants, Overview of the Programme
        Speaker: A. Meghzifene (IAEA), L. Bertocchi (ICTP)
      • 10:30 Entrance Test 20'
      • 10:50 Introduction to uncertainty; Terminology, SI system: Quantities and units 1h40'
        Speaker: A. Aalbers (Delft University of Technology, Netherlands)
      • 12:30 Lunch Break 1h0'
      • 13:30 Guide to expression of uncertainty in measurement (GUM) 1h0'
        Speaker: Brian Zimmerman (National Institute of Standards and Technology, Gaithersburg, USA)
      • 14:30 International dosimetry framework - CMCs, comparisons and KCDB 1h0'
        Speaker: A. Aalbers
      • 15:30 Coffee Break 20' ( Leonardo da Vinci Building Terrace )
      • 15:50 Uncertainties PSDLs 1h10'
        Speaker: A. Aalbers
  • Tuesday, 10 June 2014
    • 09:00 - 21:30
      • 09:00 Uncertainties SSDLs 1h0'
        Speaker: C. Hourdakis (Greek Atomic Energy Agency, Athens, Greece)
      • 10:00 Uncertainties in dosimetry: external beam radiotherapy calibrations and measurements in hospitals 30'
        Speaker: A. Meghzifene
      • 10:30 Coffee Break and Group Photograph 20' ( Leonardo da Vinci Building Terrace )
      • 10:50 Uncertainties in dosimetry: brachytherapy calibrations and measurements in hospitals 1h40'
        Speaker: L. De Werd (University of Wisconsin, Madison, USA)
      • 12:30 Lunch Break 1h0'
      • 13:30 Uncertainties in dosimetry: diagnostic radiology-calibrations and measurements in hospitals 1h0'
        Speaker: C. Hourdakis
      • 14:30 Uncertainties in dosimetry in diagnostic radiology: results of comparisons 1h0'
        Speaker: C. Hourdakis
      • 15:30 Coffee Break 20' ( Leonardo da Vinci Building Terrace )
      • 15:50 Uncertainties in dosimetry-nuclear medicine calibrations and measurements in hospitals 1h10'
        Speaker: Brian Zimmerman
      • 19:30 Workshop Buffet Dinner - Adriatico Guesthouse (all participants invited) 2h0' ( Adriatico Guest House Cafeteria )
  • Wednesday, 11 June 2014
    • 09:00 - 17:00
      • 09:00 Uncertainties in dosimetry-nuclear medicine calibrations and measurements in hospitals 1h0'
        Speaker: Brian Zimmerman
      • 10:00 Uncertainties in dosimetry: radiation protection calibration 30'
        Speaker: C. Hourdakis
      • 10:30 Coffee Break 20' ( Leonardo da Vinci Building Terrace )
      • 10:50 Uncertainties in dosimetry: radiation dose determination in protection 1h40'
        Speaker: C. Hourdakis
      • 12:30 Lunch Break 1h0'
      • 13:30 Computer Lab Sessions: Group 1: External beam radiotherapy (Aalbers/Meghzifene/Hourdakis); Group 2: Brachytherapy (De Werd/Zimmerman) 2h0'
        Group 1 in Leonardo Building InfoLab; Group 2 in Denardo Lecture Room, Adriatico Guesthouse
      • 15:30 Coffee Break 20' ( Leonardo da Vinci Building Terrace )
      • 15:50 Computer Lab Sessions: Group 1: External beam radiotherapy (Aalbers/Meghzifene/Hourdakis); Group 2: Brachytherapy (De Werd/Zimmerman) 1h10'
  • Thursday, 12 June 2014
    • 09:00 - 17:00
      • 09:00 Computer Lab Sessions: Group 1: Diagnostic radiology (Hourdakis); Group 2: Nuclear medicine (Zimmerman) 1h30'
      • 10:30 Coffee Break 20' ( Leonardo da Vinci Building Terrace )
      • 10:50 Computer Lab Sessions: Group 1: Diagnostic radiology (Hourdakis); Group 2: Nuclear medicine (Zimmerman) 1h40'
      • 12:30 Lunch Break 1h0'
      • 13:30 Presentations of results of practical exercises and discussions; Each group presents the results of practical exercises 2h0'
      • 15:30 Coffee Break 20' ( Leonardo da Vinci Building Terrace )
      • 15:50 Presentations of results of practical exercises and discussions; Each group presents the results of practical exercises 1h10'
  • Friday, 13 June 2014
    • 09:00 - 14:30
      • 09:00 Discussions on practical implementation of uncertainties 1h0'
      • 10:00 Feedback on the Workshop and discussions 30'
      • 10:30 Coffee Break 20' ( Leonardo da Vinci Building Terrace )
      • 10:50 Exit Test 1h40'
      • 12:30 Lunch Break 1h0'
      • 13:30 Closure of Workshop 1h0'