Comparison of air kerma and dose to water standards for Co-60 radiation beams for radiotherapy

Project Description

The comparisons aim supporting the calibration and measurement capabilities (CMC) of the quantities air kerma and dose to water measured in Co-60 radiotherapy beams.
With date of may 4th, 2012, METAS has replaced the Co-60 source of its Alcyon irradiation unit. Dosimetric characterisation and energy spectrum analysis have shown the old and new sources being equivalent.

BEV and LNE-LNHB will change their Co-60 sources in 2013. Both laboratories want to do measurements with their old and, if possible, with their new sources throughout the comparison. The calibration coefficients Nk and Nw of two circulating transfer ionisation chambers with their dedicated electrometer will be determined by the participants through comparison with their national standards in their respective Co-60 beams.

Final Report 2020-03-18

The comparison has been completed and results are published in the KCDB.

Progress Report 2019-01-18

The Draft B report was sent to the TC-IR Chair on December 12, 2018.

Progress Report 2014-10-15

The 2nd circulation loop of the dosimeter among the participants is ending actually and METAS will do the final measurement series before end 2014 and, thus, closing the item circulation.

Progress Report 2013-10-07

METAS, LNE-LNHB and BEV did their first measurement series in the period from March to August 2013. METAS will do throughout October a second measurement series basically in order to check the integrity and stability of the circulating equipment.
CIEMAT has joined the project as they have a new Co-60 source under characterization actually.

Ionising Radiation (IR)
Christian Kottler METAS (Switzerland)
Phone: +41 58 387 05 72
Coordinating Institute
METAS (Switzerland)