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Task Group No. 61.B - Update to AAPM's protocol for 40–300 kV x-ray beam dosimetry in radiotherapy and radiobiology (TG61.B)

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Activities
  1. Review the present TG-61 formalism to determine whether an air kerma calibration-based approach is still appropriate for clinical reference dosimetry of kV beams.
  2. Provide an Addendum to TG-61 with the following revisions and considerations:
    1. Update and extend recommended data for x-ray dosimetry with nominal beam energies up to 300 kV.              
    2. Define specifications for a reference-class ionization chamber in kV beams.
    3. Provide practical guidance on the clinical implementation of TG-61.
    4. Provide guidance on estimating uncertainties with an example uncertainty budget for clinical reference dosimetry of kV beams.
  3. Determine if it is appropriate to recommend the use of computational tools for clinical kV beam characterization and dosimetry, potentially including spectrum modeling software and/or web-based databases.
By-Laws:Not Referenced.Rules: Not Referenced.
Standing?This is not a standing committee.
Approved Date(s):5/1/2026 - 12/31/2029
Reviewable Draft Deadline:
Committee Keywords: No Keywords Entered

Board of Directors
Science Council
Therapy Physics Cmte  [Status]
Calibration Laboratory Accreditation SC  [Status]
TG61.B - Update to AAPM's protocol for 40–300 kV x-ray beam dosimetry in radiotherapy and radiobiology  [Status]

» Conflict of Interest report for TG61.B
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Chair

Bryan Muir
Task Group Chair

2026 Roster

(dates shown below are start and end dates of position.)

= complete and up-to-date
= up-to-date but expires soon
= incomplete or out of date conflict of interest statement.

VOTING AppointmentsThere are 11 voting members.

up-to-dateWesley S. Culberson, PhD

5/1/2026 - 12/31/2029 Member
up-to-dateLarry A. DeWerd, PhD

12/31/1969 - 12/31/2029 Member

up-to-dateRobin F. Hill, PhD

8/25/2026 - 12/31/2029 Member
up-to-dateStephen F. Kry, PhD

5/1/2026 - 12/31/2029 Member

up-to-dateChang Ming Charlie Ma, PhD

5/1/2026 - 12/31/2029 Member
up-to-dateErnesto Mainegra-Hing, PhD

5/1/2026 - 12/31/2029 Member

up-to-dateDimitris N. Mihailidis, PhD

5/1/2026 - 12/31/2029 Member
up-to-dateBryan R. Muir, PhD

5/1/2026 - 12/31/2029 Task Group Chair

up-to-dateAutumn Rasmussen, MS

5/1/2026 - 12/31/2029 Task Group Vice Chair
up-to-dateJan P. Seuntjens, PhD

5/1/2026 - 12/31/2029 Member

up-to-dateCsilla I. Szabo-Foster, PhD

5/1/2026 - 12/31/2029 Member
NON-VOTING AppointmentsThere are 1 non-voting members and guests.

up-to-dateJucilene Stabin

8/25/2026 - 12/31/2029 Consultant (nonvoting)
HQ Team Appointed to CommitteeThere are 0 staff.



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