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| Home > Publications database > Charge collection efficiency measurements of a PPC05 ionization chamber at ultra-high dose rate up to 64GY/pulse |
| Home > Publications database > Charge collection efficiency measurements of a PPC05 ionization chamber at ultra-high dose rate up to 64GY/pulse |
| Poster | PUBDB-2024-06633 |
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2024
Abstract: Introduction: FLASHlab@PITZ is a new R&D facility for radiationbiology studies (≤22 Mev, electrons) and is being setup at the PhotoInjector Test facility at DESY in Zeuthen (PITZ). It provides worldwideunique beam parameters regarding delivered dose and dose rate [1].With an average dose rate within one pulse of up to 109 Gy/s and peakdose rates up to 4 × 1013 Gy/s, PITZ is fully capable of ultra-high doserate experiments, for example the investigation of the FLASH effect.Furthermore, clinical dose rates of 0.05 Gy/s are also available at PITZ.Materials & Methods: Dosimetry at such high dose rates is a majorchallenge. Traditional detectors suffer from saturation and cannotprovide reliable measurements up to such high dose rates. Thecommercially available ionization chamber PPC05 (Markus type, IBADosimetry) was tested for online dosimetry. The dose per pulse can bemodified by adjusting the number of micropulses within a pulse.Results: By increasing the number of micropulses within a single pulseup to 400, a maximum dose per pulse of 64 Gy was delivered. Chargecollection efficiency from 0.16 Gy/pulse up to 64 Gy/pulse wasmeasured for four different bias voltages from 100 V up to 400 V (seefigure 1).Summary: The PITZ accelerator provides a worldwide uniqueparameter space for radiation biology studies. The number ofmicropulses within a pulse is tuneable. The ionization chamberPPC05 was irradiated with up to 64 Gy/pulse and the charge collectionefficiency was measured
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