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  1. AU="Simgen, H."
  2. AU=Carter Henry Yates
  3. AU="Tangoulis, Vassilis"
  4. AU="Ma, Michelle"
  5. AU="Osuch, Isabelle"
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  1. Article ; Online: Production and characterization of a

    Jörg, Florian / Eurin, Guillaume / Simgen, Hardy

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2023  Volume 194, Page(s) 110666

    Abstract: Precise radon measurements are a requirement for various applications, ranging from radiation protection over environmental studies to material screening campaigns for rare-event searches. All of them ultimately depend on the availability of calibration ... ...

    Abstract Precise radon measurements are a requirement for various applications, ranging from radiation protection over environmental studies to material screening campaigns for rare-event searches. All of them ultimately depend on the availability of calibration sources with a known and stable radon emanation rate. A new approach to produce clean and dry radon sources by implantation of
    Language English
    Publishing date 2023-01-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2023.110666
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Analysis of the 222Rn concentration in argon and a purification technique for gaseous and liquid argon.

    Simgen, H / Zuzel, G

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2009  Volume 67, Issue 5, Page(s) 922–925

    Abstract: We present an investigation of the (222)Rn concentration in argon with ultra-low background proportional counters. Argon purification tests by means of cryo-adsorption of radon on activated carbon were performed. For gaseous argon the purification ... ...

    Abstract We present an investigation of the (222)Rn concentration in argon with ultra-low background proportional counters. Argon purification tests by means of cryo-adsorption of radon on activated carbon were performed. For gaseous argon the purification process was found to be very efficient. Also in liquid phase the (222)Rn concentration could be reduced significantly, however, the efficiency is lower than in the gas phase. We also have analyzed the initial (222)Rn concentrations in commercial liquid argon. It was found to be significantly higher than in liquid nitrogen.
    MeSH term(s) Adsorption ; Argon/analysis ; Argon/isolation & purification ; Charcoal ; Radon/analysis
    Chemical Substances Charcoal (16291-96-6) ; Argon (67XQY1V3KH) ; Radon (Q74S4N8N1G)
    Language English
    Publishing date 2009-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2009.01.058
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: High sensitivity radon emanation measurements.

    Zuzel, G / Simgen, H

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2009  Volume 67, Issue 5, Page(s) 889–893

    Abstract: The presented radon detection technique employs miniaturized ultra-low background proportional counters. (222)Rn samples are purified, mixed with a counting gas and filled into a counter using a special glass vacuum line. The absolute sensitivity of the ... ...

    Abstract The presented radon detection technique employs miniaturized ultra-low background proportional counters. (222)Rn samples are purified, mixed with a counting gas and filled into a counter using a special glass vacuum line. The absolute sensitivity of the system is estimated to be 40 microBq (20 (222)Rn atoms). For emanation investigations two metal sealed stainless steel vessels and several glass vials are available. Taking into account their blank contributions, measurements at a minimum detectable activity of about 100 microBq can be performed.
    MeSH term(s) Gases ; Glass ; Radiation Monitoring/methods ; Radon/analysis ; Stainless Steel
    Chemical Substances Gases ; Stainless Steel (12597-68-1) ; Radon (Q74S4N8N1G)
    Language English
    Publishing date 2009-05
    Publishing country England
    Document type Evaluation Studies ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2009.01.052
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Radon daughter removal from PTFE surfaces and its application in liquid xenon detectors

    Bruenner, S. / Cichon, D. / Eurin, G. / Gómez, P. Herrero / Jörg, F. / Undagoitia, T. Marrodán / Simgen, H. / Rupp, N.

    2020  

    Abstract: Long-lived radon daughters are a critical background source in experiments searching for low-energy rare events. Originating from radon in ambient air, radioactive polonium, bismuth and lead isotopes plate-out on materials that are later employed in the ... ...

    Abstract Long-lived radon daughters are a critical background source in experiments searching for low-energy rare events. Originating from radon in ambient air, radioactive polonium, bismuth and lead isotopes plate-out on materials that are later employed in the experiment. In this paper, we examine cleaning procedures for their capability to remove radon daughters from PTFE surfaces, a material often used in liquid xenon TPCs. We found a large difference between the removal efficiency obtained for the decay chains of $^{222}$Rn and $^{220}$Rn, respectively. This indicates that the plate-out mechanism has an effect on the cleaning success. While the long-lived $^{222}$Rn daughters could be reduced by a factor of ~2, the removal of $^{220}$Rn daughters was up to 10 times more efficient depending on the treatment. Furthermore, the impact of a nitric acid based PTFE cleaning on the liquid xenon purity is investigated in a small-scale liquid xenon TPC.
    Keywords Physics - Instrumentation and Detectors ; Astrophysics - Instrumentation and Methods for Astrophysics
    Subject code 660
    Publishing date 2020-09-18
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  5. Article ; Online: Statistical analysis of low-level material screening measurements via gamma-spectroscopy.

    Heisel, M / Kaether, F / Simgen, H

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2009  Volume 67, Issue 5, Page(s) 741–745

    Abstract: Background estimations in neutrinoless double beta decay experiments (0nubetabeta) require reliable statistical limits on gamma-spectrometric low-level material screening measurements. For this purpose a custom method based on Bayesian statistics with ... ...

    Abstract Background estimations in neutrinoless double beta decay experiments (0nubetabeta) require reliable statistical limits on gamma-spectrometric low-level material screening measurements. For this purpose a custom method based on Bayesian statistics with reference to the international standard ISO 11929-7 is presented. The analysis combines the data from sample- and background spectra and comprises the physical knowledge of non-negative counting rates. It allows to incorporate multiple gamma lines of radionuclides. The confidence intervals pass continuously from two-sided intervals into single-sided upper limits.
    MeSH term(s) Bayes Theorem ; Internationality ; Radioisotopes/analysis ; Reference Standards ; Spectrometry, Gamma/methods
    Chemical Substances Radioisotopes
    Language English
    Publishing date 2009-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2009.01.028
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Optimisation of the MC-model of a p-type Ge-spectrometer for the purpose of efficiency determination.

    Budjás, D / Heisel, M / Maneschg, W / Simgen, H

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2009  Volume 67, Issue 5, Page(s) 706–710

    Abstract: An optimisation of the geometrical model of a p-type detector used for material screening was carried out to improve the accuracy of Monte Carlo simulations in reproducing spectrometric measurements. Gamma-ray sources were measured to determine the ... ...

    Abstract An optimisation of the geometrical model of a p-type detector used for material screening was carried out to improve the accuracy of Monte Carlo simulations in reproducing spectrometric measurements. Gamma-ray sources were measured to determine the dimensions of the detector dead layer and borehole. An agreement between simulations and measurement within 3% was achieved at energies above 100 keV. In contrast, discrepancies on the order of 23% were encountered using the nominal parameters from the detector manufacturer.
    Language English
    Publishing date 2009-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2009.01.015
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Book ; Online ; Thesis: Hochempfindlicher Nachweis radioaktiver Edelgasnuklide und natürlicher Radionuklide aus der Uran-Zerfallsreihe

    Simgen, Hardy

    2003  

    Title variant Highly sensitive detection of radioactive noble gas nuclides and of natural radionuclides from the uranium decay chain
    Author's details vorgelegt von Hardy Simgen
    Keywords Uran ; Radiochemische Analyse ; Edelgasisotop ; Zerfallsreihe ; Natürliches Radionuklid
    Language German ; English
    Size Online-Ressource (PDF-Datei: 160 S., 1.410 KB)
    Publisher Univ.-Bibl
    Publishing place Heidelberg
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--Heidelberg, 2003
    Note Zsfassung in engl. und dt. Sprache
    Database Former special subject collection: coastal and deep sea fishing

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  8. Book ; Thesis: Hochempfindlicher Nachweis radioaktiver Edelgasnuklide und natürlicher Radionuklide aus der Uran-Zerfallsreihe

    Simgen, Hardy

    2003  

    Author's details [von Hardy Simgen]
    Language German
    Size VII, 145 S, Ill., graph. Darst
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--Heidelberg, 2003
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Book ; Online ; Thesis: Hochempfindlicher Nachweis radioaktiver Edelgasnuklide und natürlicher Radionuklide aus der Uran-Zerfallsreihe

    Simgen, Hardy

    2003  

    Title variant Highly sensitive detection of radioactive noble gas nuclides and of natural radionuclides from the uranium decay chain
    Author's details vorgelegt von Hardy Simgen
    Keywords Uran ; Radiochemische Analyse ; Edelgasisotop ; Zerfallsreihe ; Natürliches Radionuklid
    Language German ; English
    Size Online-Ressource (PDF-Datei: 160 S., 1.410 KB)
    Publisher Univ.-Bibl
    Publishing place Heidelberg
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--Heidelberg, 2003
    Note Zsfassung in engl. und dt. Sprache
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  10. Article ; Online: Underground gamma-ray measurements of radium isotopes from hydrothermal plumes in the deep Pacific Ocean.

    Hult, Mikael / Charette, Matthew / Lutter, Guillaume / Marissens, Gerd / Henderson, Paul / Sobiech-Matura, Katarzyna / Simgen, Hardy

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2019  Volume 153, Page(s) 108831

    Abstract: The radium ... ...

    Abstract The radium isotopes
    Language English
    Publishing date 2019-07-31
    Publishing country England
    Document type Journal Article
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2019.108831
    Database MEDical Literature Analysis and Retrieval System OnLINE

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