Measurement of short-lived radon progenies by simultaneous αγ-spectrometry at the German radon reference chamber

Paul, A.; Röttger, Stefan; Honig, A.; Sulima, T; Buchholz, Allan C.; Keyser, U.

doi:10.1016/s0168-9002(99)00526-4

Cited by 23 publications

(7 citation statements)

References 9 publications

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“…Actually, radon progeny emits β , γ as well as α particles. Due to the quick development of gamma spectrometry and beta spectrum analysis technology, there appeared some methods like “ β count” method [ 14 , 15 ], “ α - γ spectra” method [ 16 ], and “ α - β count method” [ 17 ]. Although those methods are not widely used in commercial device, they give us a cue to improve our current method.…”

Section: The Development Of Radon Progeny Measurement Methodsmentioning

confidence: 99%

Efficiency Analysis and Comparison of Different Radon Progeny Measurement Methods

Abdumomin

Zhang²,

Guo

et al. 2013

The Scientific World Journal

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Radon exposure to the public contributes more than half of all the radiation doses caused by natural radiation; accurate measurement of radon progeny is quite essential for the dose evaluation of radon exposure in environment. For the purpose of establishing a radon progeny standard and controlling measurement quality of commercial devices, it is quite important to analyze the efficiency of different measurement methods and determine which would be the most appropriate for radon progeny measurements. Through theoretical analysis and experimental measurement, some commonly used measurement methods were compared in this study and the development trends of those methods were reviewed. Results show that for radon progeny measurement, the spectroscopic analysis method is better than the gross count method, while least-square calculation methods is better than traditional three-count or five-count method. Multiperiod counting of α plus β spectrum as well as using weighted least-square calculation method might be the best choice for accurate measurement on radon progeny in standard radon chamber when calibrating commercial radon progeny monitors.

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Section: The Development Of Radon Progeny Measurement Methodsmentioning

confidence: 99%

Efficiency Analysis and Comparison of Different Radon Progeny Measurement Methods

Abdumomin

Zhang²,

Guo

et al. 2013

The Scientific World Journal

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“…It was immediately clear t�at f un values are muc� �ig�er t�an in indoor air in kindergartens (Vaupotič 2007) and sc�ools (Vaupotič & Kobal 2006). There are two possible reasons for t�at: eit�er a low aerosol concentration in air and �ence a �indered attac�ment of decay products to aerosols (Butterweck et al 1992) or a very �ig� relative air �umidity (practically 100 %) causing was�out of aerosols (Paul 1999). In order to prove t�e first possibility, we recently started measurements of concentration and size distribution of aerosols in t�e size range 10-1,000 nm at several points in t�e cave.…”

Section: Radon Decay Products In the Postojnamentioning

confidence: 99%

Radon levels in karst caves in Slovenia

Vaupotič

2012

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A review is given on the radon survey in the Slovenian karst caves, those open for tourists and those for cavers and speleologists only. Radon concentrations differed markedly from cave to cave, as well as from point to point in the same cave. In addition to radon, in the Postojna Cave also radon decay products (RnDP), equilibrium factor between radon and RnDP, and the unattached fraction of RnDP have been monitored. Based on highradon levels, permanent radon monitoring was introduced in Postojna Cave and time spent by workers in the cave limited in order to keep their exposure to radon acceptably low.

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“…For short-lived 222 Rn-progenies systematic investigations [2,10] of the capability of the reference samples in a well-defined air flow showed high and reproducible collection efficiencies according to the state of attachment of the radioactive ion. Of the so-called 'unattached fraction' (progenies which are not attached to aerosols) 95.2(10) % can be collected on the stainless steel screen, while of the 'attached fraction' (progenies which are attached to aerosols) only 1.5(5) % is collected .…”

Section: Experimental Set-up For the Activity Concentration Of Radon mentioning

confidence: 99%

“…However, the assignment of the counted α-particles to the isotopes they are emitted from is rather difficult and time consuming. This work presents a new concept for the determination of the activity concentration of different radon and radon progenies including collection efficiencies, as well as basic equations [2] and first results obtained at the switch yard of ISOLDE 2. By the implementation of a well-defined flow, the measurement of the time for taking the reference sample and the determination of the activity by α-and/or γ-spectrometry, the activity concentration of the progenies is established on the basis of new accurate collection efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Traceable measurements of the activity concentration in air

et al. 2002

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The nuclear reactions induced by high energetic protons in heavy targets such as UC 2 and ThC cause a particular, complex radiation protection task at facilities like ISOLDE: the measurement of a mixture of different isotopes of the radioactive noble gas radon and the radon progenies in air. The knowledge of their respective activity concentration is fundamental for exposure assessments.Due to the complex mixture of activity concentrations in air, its precise determination is quite difficult. Therefore, a new procedure for taking reference samples was developed and implemented for the traceable measurement of the activity concentration of radioactive ions (e.g. radon progenies) in air. This technique is combined by measuring α-particles with a multi-wire ionization chamber for the parallel on-line determination of the activity concentration of different radon isotopes.

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Measurement of short-lived radon progenies by simultaneous αγ-spectrometry at the German radon reference chamber

Cited by 23 publications

References 9 publications

Efficiency Analysis and Comparison of Different Radon Progeny Measurement Methods

Efficiency Analysis and Comparison of Different Radon Progeny Measurement Methods

Radon levels in karst caves in Slovenia

Traceable measurements of the activity concentration in air

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