Uncertainties and characteristic limits of counting and spectrometric dosimetry systems

Röttger, A.; Kessler, P.

doi:10.1016/j.jenvrad.2019.04.012

Cited by 11 publications

(7 citation statements)

References 14 publications

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“…The uncertainty of each measurement according to [22] depends on the energy and dose rate, more precisely on the photon fluence and the integration time of the measurement. A detailed description of the uncertainty assessment of spectrometric dosimetry systems can be found in [19].…”

Section: Discussionmentioning

confidence: 99%

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Monte Carlo Simulations of scintillation detectors for the use as dosemeters

Alegría¹,

Kessler²,

Gabay³

et al. 2021

J. Inst.

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The energy dependent conversion factors from measured photon pulse height spectra to ambient dose equivalent (H*(10)) of three different detectors based on the scintillation materials CeBr_3, LaBr3 and SrI2 were simulated with the three Monte Carlo Codes, GEANT4, MCNP and PENELOPE, respectively. The performance of the detection systems, using the calculated conversion factors (fitted to response functions), is demonstrated for different scenarios ranging from laboratory conditions (i.e. a precisely defined radiation field in a calibration facility) to a free-field irradiation scenario produced by the natural radioactivity at a large lawn. With very simple geometric models of the detector systems, the response function of scintillation based dosemeters can be derived from the aforementioned Monte Carlo simulations with an accuracy of the measured doses in H*(10) of ±10% in an photon energy range from 100 keV to 3000 keV, as being typical for natural environmental gamma radiation.

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Section: Discussionmentioning

confidence: 99%

“…A polynomial function couldn't describe this shape. However, it is possible to fit a combination of two exponential functions and two step functions to the 𝑣 𝑖 𝑠 as described in [19].…”

Section: Jinst 16 P09016 4 Calculation Of the Conversion Function And...mentioning

confidence: 99%

Monte Carlo Simulations of scintillation detectors for the use as dosemeters

Alegría¹,

Kessler²,

Gabay³

et al. 2021

J. Inst.

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“…Consideration of dynamic soil parameters (e.g., soil moisture) on radon transport processes, and thus on radon activity concentrations in soil air, may contribute significantly to characterization of radon potential. Within this project experimental calibrated data of atmospheric radon activity concentrations and radon flux as well as dose rate and spectrometry data (Röttger and Kessler, 2019) will be used to validate available radon flux models and inventories (e.g., Szegvary et al, 2009;Karstens et al, 2015). Finally, it is planned to make the radon outdoor air monitoring stations available online similar to the local gamma dose rate via EURDEP.…”

Section: Radon In Radiation Protectionmentioning

confidence: 99%

Radon metrology for use in climate change observation and radiation protection at the environmental level

Röttger

Grossi³

et al. 2022

Adv. Geosci.

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Abstract. Radon (222Rn) gas is the largest source of public exposure to naturally occurring radioactivity and the identification of radon priority areas is required by the Council Directive 2013/59/Euratom. Radon is also used as a tracer to improve atmospheric transport models and to indirectly estimate greenhouse gas (GHG) fluxes using the Radon Tracer Method (RTM). This method is based on the correlation between atmospheric concentrations of radon and GHG, together with information on the radon flux data. For radiological data, all European countries have installed networks of automatic gamma dose rate monitoring stations and report the real-time information gathered to the European Radiological Data Exchange Platform (EURDEP). So far, atmospheric radon activity concentrations and radon fluxes are not yet reported in EURDEP, nor routinely measured within the European radiological networks although these observations could help to avoid false positives results. Due to above applications, there is a need of building a metrological chain to ensure high quality radon activity concentrations and radon flux measurements. Both climate and radiation protection research communities underline the need for improved traceability in low-level atmospheric radon measurements (Khanbabaee et al., 2021). The EMPIR project 19ENV01 traceRadon1 is aimed towards providing the necessary measurement infrastructure and transfer standards to fulfil this need. Results of this project are particularly important for improving independent GHG emission estimates that support national reporting under the Paris Agreement on climate change and for the Council Directive 2013/59/Euratom, thus benefitting two large scientific communities. In this paper, early results, such as new activity standard developments and an overview of commercial and research radon monitors are presented and discussed. These results will feed into the traceRadon project with respect to radionuclide metrology in air and its potential for the improvement of the RTM.

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“…According to the four-bin calculation, the conversion function should firstly be monotonously decreasing due to the high probability of photon detection in the active volume and the high interaction probability with the detector housing up to the energy of 57 Co. Secondly, it should be monotonously increasing to the energy of 137 Cs with a saturation for the photon energies higher than 60 Co due to the detection efficiency falloff for high-energy photons [8]. Therefore, the proposed model function consists of two exponential saturation functions [10]:…”

Section: Conversion Functionmentioning

confidence: 99%

Cadmium Zinc Telluride Solid-State Detector Characterisation for Its Use as a Spectro-Dosemeter

Kržanović¹,

Röttger²,

Morosh³

et al. 2020

RAP 2019 Conference Proceedings

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Concerning ionising radiation monitoring in the environment in areas which, by normal means, are inaccessible, e.g. in contaminated areas after a nuclear or radiological incident, the use of highly mobile systems, comprising of unmanned airborne vehicles equipped with ionising radiation detector, is advised in order to protect the health and the life of first responders. As a promising candidate, the compact solid-state spectrometer based on CdZnTe is characterised by performing irradiations in the reference radionuclide radiation fields of PTB. The energydependent conversion coefficients are derived from recorded pulse-height spectra, and they enable calculation of the operational radiation protection quantity, ambient dose equivalent rate, directly from the spectrum without deconvolution. The validity of the conversion coefficients was evaluated by determining the deviation of the calculated dose rate from the reference ambient dose equivalent rate for the 226 Ra radionuclide, available at the Underground Dosimetry Laboratory (UDO II) of PTB. By employing the derived conversion coefficients, the detector "linearity" (dose rate dependence of the response) was checked in the 137 Cs reference fields of different ambient dose equivalent rates ranging from 25 nSv/h up to 1 μSv/h. The deviation of the calculated 226 Ra dose rate from the achieved reference value was +2%.

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Uncertainties and characteristic limits of counting and spectrometric dosimetry systems

Cited by 11 publications

References 14 publications

Monte Carlo Simulations of scintillation detectors for the use as dosemeters

Monte Carlo Simulations of scintillation detectors for the use as dosemeters

Radon metrology for use in climate change observation and radiation protection at the environmental level

Cadmium Zinc Telluride Solid-State Detector Characterisation for Its Use as a Spectro-Dosemeter

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