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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) AAPM Members, Affiliates and Non-Member Affiliates - Login for access to additional information Activities 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. Provide an Addendum to TG-61 with the following revisions and considerations: Update and extend recommended data for x-ray dosimetry with nominal beam energies up to 300 kV.               Define specifications for a reference-class ionization chamber in kV beams. Provide practical guidance on the clinical implementation of TG-61. Provide guidance on estimating uncertainties with an example uncertainty budget for clinical reference dosimetry of kV beams. 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 » Status Reports for Task Groups - AC | EC | IC | PC | SC | Board Committees | All

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= incomplete or out of date conflict of interest statement.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 Appointments

There are 10 voting members.

Wesley S. Culberson, PhD 5/1/2026 - 12/31/2029 Member	Larry A. DeWerd, PhD 12/31/1969 - 12/31/2029 Member
Stephen F. Kry, PhD 5/1/2026 - 12/31/2029 Member	Chang Ming Charlie Ma, PhD 5/1/2026 - 12/31/2029 Member
Ernesto Mainegra-Hing, PhD 5/1/2026 - 12/31/2029 Member	Dimitris N. Mihailidis, PhD 5/1/2026 - 12/31/2029 Member
Bryan R. Muir, PhD 5/1/2026 - 12/31/2029 Task Group Chair	Autumn Rasmussen, MS 5/1/2026 - 12/31/2029 Task Group Vice Chair
Jan P. Seuntjens, PhD 5/1/2026 - 12/31/2029 Member	Csilla I. Szabo-Foster, PhD 5/1/2026 - 12/31/2029 Member

NON-VOTING Appointments

There are 0 non-voting members and guests.

HQ Team Appointed to Committee

There are 0 staff.

See connections to Task Group No. 61.B - Update to AAPM's protocol for 40–300 kV x-ray beam dosimet

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