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Correction of the effects of carbon dioxide and hydrogen sulfide on electrostatic cell monitors measurements of radon in water

Begy Robert-Csaba; Codrin Savin; Alida Timar-Gabor


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        <foaf:name>Codrin Savin</foaf:name>
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        <foaf:name>Alida Timar-Gabor</foaf:name>
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    <dct:title>Correction of the effects of carbon dioxide and hydrogen sulfide on electrostatic cell monitors measurements of radon in water</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2021</dct:issued>
    <dcat:keyword>RAD7, Radon Water, Carbon dioxide, Hydrogen sulfide, 218Po neutralization</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2021-12-21</dct:issued>
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    <dct:description>&lt;p&gt;The present study shows that the presence of hydrogen sulfide and carbon dioxide in water have a negative effect&lt;br&gt; on the accuracy of radon measurements in samples when an electrostatic ion collector device (RAD7) is used.CO2&lt;br&gt; concentrations between 0.65 g/l and 5.19 g/l were generated in water samples containing 222Rn activities&lt;br&gt; ranging from 23.4 &amp;plusmn; 0.9 Bq/l to 6.7 &amp;plusmn; 0.9 Bq/l, after which the samples were measured by a RAD7 device, and&lt;br&gt; the results compared to the radon activity values of the gas-free samples. The same procedure was followed for&lt;br&gt; H2S concentrations from 0.125 mg/l to 3 mg/l. In both cases, a major impact was observed, the radon apparent&lt;br&gt; specific activities decreasing exponentially with gas concentration. For a CO2 concentration of 1.29 g/l, the&lt;br&gt; apparent specific activity underestimated the true value by 24.5%, while for a concentration of 5.19 g/l CO2 the&lt;br&gt; decrease was of 57%. For H2S, the radon measured values decreased by 42.5% for concentrations as low as 0.5&lt;br&gt; mg/l, culminating in a reduction of 86.9% for 3 mg/l H2S. We are attributing these effects to 218Po neutralization&lt;br&gt; processes, which reduces the electrostatic efficiency of the silicon detector system. To eliminate the interferences&lt;br&gt; of these gases on RAD7 measurements, a sample preparation method was developed and tested, involving the&lt;br&gt; precipitation and deposition of CO2 using Ca(OH)2, and H2S using Pb(NO3)2..The findings of the present study&lt;br&gt; clearly indicate that in order to perform valid radon measurements in gas-rich waters with RAD7, the effect of the&lt;br&gt; interfering gases must be considered.&lt;/p&gt;</dct:description>
    <dct:description>EEA and Norway Grants, EEA-RO-NO-2018-0126, 3/2019.</dct:description>
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