Considerations concerning the use of counting active personal dosemeters in pulsed fields of ionising radiation

Ambrosi, P.; Borowski, Markus; Iwatschenko, Michael

doi:10.1093/rpd/ncp286

Cited by 23 publications

(6 citation statements)

References 2 publications

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“…Since all selected APDs, except PM1621A, provide a reading in the pulsed mode, this means they could be used in routine monitoring at hospitals, provided correction factors are introduced (11) . Some preliminary guidelines with recommendations on how to use APDs in practice were presented at IRPA2010 (12) .…”

Section: Resultsmentioning

confidence: 99%

Active personal dosemeters in interventional radiology: tests in laboratory conditions and in hospitals

Clairand

Bordy

Daures

et al. 2010

Radiation Protection Dosimetry

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The work package 3 of the ORAMED project, Collaborative Project (2008-11) supported by the European Commission within its seventh Framework Programme, is focused on the optimisation of the use of active personal dosemeters (APDs) in interventional radiology and cardiology (IR/IC). Indeed, a lack of appropriate APD devices is identified for these specific fields. Few devices can detect low-energy X rays (20-100 keV), and none of them are specifically designed for working in pulsed radiation fields. The work presented in this paper consists in studying the behaviour of some selected APDs deemed suitable for application in IR/IC. For this purpose, measurements under laboratory conditions, both with continuous and pulsed X-ray beams, and tests in real conditions on site in different European hospitals were performed. This study highlights the limitations of APDs for this application and the need of improving the APD technology so as to fulfil all needs in the IR/IC field.

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Section: Resultsmentioning

confidence: 99%

Active personal dosemeters in interventional radiology: tests in laboratory conditions and in hospitals

Clairand

Bordy

Daures

et al. 2010

Radiation Protection Dosimetry

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“…In addition, it is recommended to use the audio or visual alarm, both in dose and dose rate regime. The dose and dose rate level to which an alarm would be set depends on the type of practice and characteristics of both the dosimeter and radiation field (Ambrosi et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Use of active personal dosimeters in hospitals: EURADOS survey

2018

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Considering that occupational exposure in medicine is a matter of growing concern, active personal dosimeters (APDs) are also increasingly being used in different fields of application of ionising radiation in medicine. An extensive survey to collect relevant information regarding the use of APDs in medical imaging applications of ionising radiation was organised by the EURADOS (European Radiation Dosimetry Group) Working Group 12. The objective was to collect data about the use of APDs and to identify the basic problems in the use of APDs in hospitals. APDs are most frequently used in interventional radiology and cardiology departments (54%), in nuclear medicine (29%), and in radiotherapy (12%). Most types of APDs use silicon diodes as the detector; however, in many cases their calibration is not given proper attention, as radiation beam qualities in which they are calibrated differ significantly from those in which they are actually used. The survey revealed problems related to the use of APDs, including their reliability in pulsed x-ray fields that are widely used in hospitals. Guidance from regulatory authorities and professional organisations on the testing and calibration of APDs used in hospital would likely improve the situation.

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“…Given that accurately measuring the dose and dose rate in pulsed radiation fields is challenging for both the manufacturers and users of devices as well as organizations involved in licensing, this should be reviewed to maintain radiation safety [11][12]. Even though only technical specifications and articles regarding measurements in pulsed radiation fields are available, direct testing methods or standards are not approved yet by the Hungarian measurement office [13][14][15][16][17][18][19][20].…”

Section: Previous Measurements In Pulsed Radiation Fieldsmentioning

confidence: 99%

Testing Measuring Devices in Well-Defined Pulsed Radiation Fields

2023

RAD Conference Proceedings

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There is a growing need for research, detector testing and metrological methods to study pulsed radiation fields because many facilities (e.g. high-power laser facilities) and devices produce pulsed ionizing radiation. Although the ELI ALPS laser facility is already operational in Hungary, the operational parameters (frequency of the laser shots, daily operational time of the laser, energy of the laser pulse and the number of the generated particles in the laser-matter interaction) are low, thus the generated pulsed radiation is negligible. Over the following ten years, the operational parameters will be drastically enhanced. In pulsed radiation fields, since the dose rate changes rapidly as a function of time, detectors in commonly used radiation protection measuring devices are not always able to track and accurately measure the dose nor the dose rate above a certain level of exposure. The general goal was to improve our knowledge of and capability to investigate as well as test measuring devices in well-defined pulsed fields to be able to give advice to users and the regulating Authority. The available X- ray source for this type of testing has its limitations, thus the additional goal was to develop a special device that can generate a well-defined pulsed radiation field, which can be adjustable and further developed. Preliminary tests were conducted using an X-ray device and continued with a self-developed Gamma chopper. A STEP OD-02 meter was used as a reference detector and the measurement results compared to the theoretical values. The created pulsed field by the Gamma chopper was known, the dose rate per angle was determined by its mechanical structure, these were the theoretical values. Ionization chambers and TLDs were tested in different pulsed radiation fields. The capabilities and properties of the generated pulsed radiation field as well as the stability of the Gamma chopper were tested. The results were similar to those in the literature, i.e. measuring devices tend to underestimate the dose and dose rate in pulsed radiation fields. The measurements recorded by the STEP OD- 02 meter were in good agreement with the theoretical values. The tests highlighted that selection of the operation mode is crucial in order to accurately measure pulsed radiation fields with ionization chambers. Even though the Gamma chopper can be improved, its heeling effect (swaying, vibration of the rotating disk) was not identified. In the future, the capabilities of the Gamma chopper will be extended to increase its frequency and unshielded to shielded ratio, moreover, measurement procedures will be drawn up to test measuring devices in pulsed radiation fields when using it. Our test campaign was carried out with a precise series of measurements.

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Considerations concerning the use of counting active personal dosemeters in pulsed fields of ionising radiation

Cited by 23 publications

References 2 publications

Active personal dosemeters in interventional radiology: tests in laboratory conditions and in hospitals

Active personal dosemeters in interventional radiology: tests in laboratory conditions and in hospitals

Use of active personal dosimeters in hospitals: EURADOS survey

Testing Measuring Devices in Well-Defined Pulsed Radiation Fields

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