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Characterisation of a cobalt-60 small-beam animal irradiator using a realtime silicon pixelated detector

Journal Article


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Abstract


  • The paper presents a study performed by the Centre for Medical Radiation Physics

    (CMRP) using a high spatial and temporal resolution silicon pixelated detector named MagicPlate-

    512. The study focuses on the characterisation of three pencil beams from a low-dose rate, 6

    TBq, cobalt-60 source, in terms of percentage depth dose, beam profiles, output factor and shutter

    timing. Where applicable, the findings were verified against radiochromic EBT3 film and ionization

    chambers. It was found that the results of the MagicPlate-512 and film agreed within 0.9 mm for

    penumbra and full-width at half-maximum measurements of the beam profiles, and within 0.75%

    for percentage depth dose study. The dose rate of the cobalt-60 source was determined to be

    (10.65±0.03) cGy/min at 1.5 cm depth in Solid Water. A significant asymmetry of the small pencil

    beam profile was found, which is due to the irregular machining of the small collimator. The average

    source shutter speed was calculated to be 26 cm/s. The study demonstrates that the MagicPlate-512

    dosimetry system, developed at CMRP, is capable of beam characterisation even in cases of very

    low dose rate sources.

UOW Authors


Publication Date


  • 2016

Citation


  • Porumb, C. S., Davies, J. B., Perevertaylo, V., Rosenfeld, A. B. & Petasecca, M. (2016). Characterisation of a cobalt-60 small-beam animal irradiator using a realtime silicon pixelated detector. Journal of Instrumentation, 11 (4), P04014-1-P04014-14.

Scopus Eid


  • 2-s2.0-85009754934

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6453&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5425

Start Page


  • P04014-1

End Page


  • P04014-14

Volume


  • 11

Issue


  • 4

Abstract


  • The paper presents a study performed by the Centre for Medical Radiation Physics

    (CMRP) using a high spatial and temporal resolution silicon pixelated detector named MagicPlate-

    512. The study focuses on the characterisation of three pencil beams from a low-dose rate, 6

    TBq, cobalt-60 source, in terms of percentage depth dose, beam profiles, output factor and shutter

    timing. Where applicable, the findings were verified against radiochromic EBT3 film and ionization

    chambers. It was found that the results of the MagicPlate-512 and film agreed within 0.9 mm for

    penumbra and full-width at half-maximum measurements of the beam profiles, and within 0.75%

    for percentage depth dose study. The dose rate of the cobalt-60 source was determined to be

    (10.65±0.03) cGy/min at 1.5 cm depth in Solid Water. A significant asymmetry of the small pencil

    beam profile was found, which is due to the irregular machining of the small collimator. The average

    source shutter speed was calculated to be 26 cm/s. The study demonstrates that the MagicPlate-512

    dosimetry system, developed at CMRP, is capable of beam characterisation even in cases of very

    low dose rate sources.

UOW Authors


Publication Date


  • 2016

Citation


  • Porumb, C. S., Davies, J. B., Perevertaylo, V., Rosenfeld, A. B. & Petasecca, M. (2016). Characterisation of a cobalt-60 small-beam animal irradiator using a realtime silicon pixelated detector. Journal of Instrumentation, 11 (4), P04014-1-P04014-14.

Scopus Eid


  • 2-s2.0-85009754934

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6453&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5425

Start Page


  • P04014-1

End Page


  • P04014-14

Volume


  • 11

Issue


  • 4