Use of Active Personal Dosemeters in Interventional Radiology: A Systematic Study in Laboratory Conditions

Clairand, I.; Bordy, J.M.; Daures, J.; Debroas, J.; Denoziére, M.; Donadille, L.; Ginjaume, M.; Itié, C.; Koukorava, C.; Lebacq, A. L.; Martin, Paul R; Struelens, Lara; Merce, Marta Sans; Toŝić, Mirjana; Vanhavere, F.

doi:10.1007/978-3-642-03902-7_38

Cited by 2 publications

(4 citation statements)

References 3 publications

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“…The effectively smaller energies do not pose a problem to the response of Dosepix, which operates above 12 keV. The small pixels would allow an active warning in accident situations, e.g., if the person is exposed to the direct X-ray radiation field of a medical diagnostic X-ray tube where dose rates up to 360 Sv/h can occur [4]. The maximum relative statistical uncertainties of the large and small pixels are 0.24% and 0.49%, respectively.…”

Section: B Dependence On the Dose Ratementioning

confidence: 99%

“…These dose rates occur in the case of situations in which the wearer of the dosemeter accidentally gets exposed by the direct beam of a pulsed radiation field. For example, the relevant radiation field characteristics in IR/IC are a pulse duration of 1-20 ms, a dose rate in the direct radiation field of 2-360 Sv/h, and of 5 mSv/h to 10 Sv/h in the scattered radiation field [4]. Latter dose rate is stated for a dosemeter worn above the lead apron of the operator.…”

Section: Introductionmentioning

confidence: 99%

“…Latter dose rate is stated for a dosemeter worn above the lead apron of the operator. The energy range of the spectra in the scattered beam of the radiation field for interventional procedures is between 20-100 keV for peak high voltages of up to 120 kV [4]. In this work, Dosepix [5] is utilized in a system consisting of three Dosepix detectors to investigate its dose rate and pulse duration dependence for the personal dose equivalent H p (10) in the direct beam of a pulsed photon field.…”

Section: Introductionmentioning

confidence: 99%

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Personal Dosimetry in Direct Pulsed Photon Fields With the Dosepix Detector

Haag

Schmidt

Hufschmidt

et al. 2022

IEEE Trans. Nucl. Sci.

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First investigations regarding dosimetric properties of the hybrid, pixelated, photon-counting Dosepix detector in the direct beam of a pulsed photon field (RQR8) for the personal dose equivalent Hp(10) are presented. The influence quantities such as pulse duration and dose rate were varied, and their responses were compared to the legal limits provided in PTB-A 23.2. The variation of pulse duration at a nearly constant dose rate of about 3.7 Sv/h shows a flat response around 1.0 from 3.6 s down to 2 ms. A response close to 1.0 is achieved for dose rates from 0.07 Sv/h to 35 Sv/h for both pixel sizes. Above this dose rate, the large pixels (220 µm edge length) are below the lower limit. The small pixels (55 µm edge length) stay within limits up to 704 Sv/h. The count rate linearity is compared to previous results, confirming the saturating count rate for high dose rates.

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Section: B Dependence On the Dose Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Personal Dosimetry in Direct Pulsed Photon Fields With the Dosepix Detector

Haag

Schmidt

Hufschmidt

et al. 2022

IEEE Trans. Nucl. Sci.

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“…Although they are mainly exposed to scattered radiation coming from the patient, part of the exposure might also come from the x-ray tube. On the other hand, calculations in the scattered field are also of interest for dosimetry and calibration laboratory which test and irradiate dosemeters within scattered fields (Clairand et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the scattered radiation field around an x-ray tube

Struelens

Kauwenberghs²,

Vanhavere

2011

Phys. Med. Biol.

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To determine patient doses or doses to the medical staff, Monte Carlo calculations are frequently applied. In these kinds of calculations the x-ray tube is often simplified to make the calculations faster. The purpose of this study is to investigate the influence of simplifications in the Monte Carlo set-up of the x-ray tube on the observed differences between measurements and calculations in the scattered field. At a distance of 50 and 100 cm from the focal spot, air kerma calculations are done for different angles from -90° to 90° from the central beam axis in steps of 15° with the Monte Carlo software code MCNP-X. Different calculations were performed where each time a component of the simulated x-ray tube (collimator, filters, etc) or the environment (walls) is included. Scattered doses are also measured with thermoluminescent dosemeters. For the most simplified geometry of the x-ray tube, measurements are on average 70% larger than the calculated results. A much better agreement with the measurements is observed for more realistic calculations. The current work applies to a particular source in the SCK•CEN calibration laboratory; therefore the obtained results are representative and relevant for studies in calibration laboratories. As clinical sources have more shielding material and as in real imaging situations the scatter generated at the patient is much larger than the scatter leaking from the source, the results of this study have a limited impact on the wider field of clinical dosimetry.

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Use of Active Personal Dosemeters in Interventional Radiology: A Systematic Study in Laboratory Conditions

Cited by 2 publications

References 3 publications

Personal Dosimetry in Direct Pulsed Photon Fields With the Dosepix Detector

Personal Dosimetry in Direct Pulsed Photon Fields With the Dosepix Detector

Characterization of the scattered radiation field around an x-ray tube

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