6 research outputs found
Merits and demerits of different methods for radon exhalation measurements for building materials
With an increase in the awareness of the need to save energy, residents tend to live in dwellings with increasingly tight windows and doors, thus reducing the ventilation rate of indoor air which leads to an increased accumulation of radon indoors. Having in mind that a dose from an exposure to inhaled radon and its progenies can be higher than a dose received from radium in building materials, it is suggested that radon exhalation measurements should receive due attention. In this contribution, the authors compare results gathered using a few methods for radon exhalation measurement and discuss its merits and demerits
Numerical simulation of temperature field in the vertical bridgman method crystal growth
The mathematical model for heat transfer during the Bridgeman crystal growth, using the finite element method and the obtained result are presented. Some modifications to the method were introduced in order to incorporate the data obtained experimentally. Solving the model enabled comparison of the experimental and numerical data and to obtain sufficient accuracy. The model was used to calculate the temperature gradient in the sample and the calculated gradient was in accordance with the observed crystal growth regime
Novel method of measurement of radon exhalation from building materials
In the era of the energy saving policy (i.e. more air tight doors and windows), the radon exhaled from building materials tends to increase its concentration in indoor air, which increases the importance of the measurement of radon exhalation from building materials. This manuscript presents a novel method of the radon exhalation measurement using only a HPGe detector or any other gamma spectrometer. Comparing it with the already used methods of radon exhalation measurements, this method provides the measurement of the emanation coefficient, the radon diffusion length and the radon exhalation rate, all within the same measurement, which additionally defines materials radon protective properties. Furthermore it does not necessitate additional equipment for radon or radon exhalation measurement, which simplifies measurement technique, and thus potentially facilitates introduction of legal obligation for radon exhalation determination in building materials. (C) 2016 Elsevier Ltd. All rights reserved
Ad-hoc intercomparison of four different radon exhalation measurement methods
It is indicated that the exposure to radon originating from the building materials is not negligible and the radon exhalation measurement should get more attention in the future. The experience with four different methods of the exhalation measurement, established in our laboratory for the purpose of the intercomparison is reported. Additionally, a comparison of advantages and disadvantages of used methods is discussed
The Evolutionary Policy Maker
Prikazan je pregled najnovijeg gama metoda za merenje ekshalacije radona iz
graÄevinskih materijala, koji pored ekshalacije omoguÄava merenje faktora emanacije i
merenje difuzione dužine radona u datom materijalu, Å”to nije moguÄe u standardnim
merenjima ekshalacije radona. TakoÄe su prikazana i joÅ” tri standardna metoda
merenja ekshalacije radona i dato je uporedno objaŔnjene prednosti i mana ovih
metoda. BiÄe dat i pregled dosadaÅ”njih merenja u Srbiji.A review of a new radon exhalation measurement method is presented. This method
provides also a measurement of the radon diffusion length and the radon emanation
coefficient, which is not possible by standard radon exhalation measurement methods.
Besides, three standard radon exhalation measurements are presented: closed chamber
with an active instrument, closed chamber with a solid state nuclear track detector and
a charcoal canister method. An intercomparison of advantages and disadvantages is
also given. A short review of previous measurements of radon exhalation from
comercial building materials in Serbia will be given in the presentation