Measurement of the Po concentration in air using makrofol-de detectors |
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Authors: | C Baixeras K Amgarou L L Font C Domingo F Fernndez |
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Institution: | C. Baixeras, K. Amgarou, L. L. Font, C. Domingo,F. Fernández |
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Abstract: | The measurement of the 214Po concentration in air with Makrofol-DE detectors is useful to estimate the long-term averaged equilibrium factors indoors. To differentiate α-particles emitted by 214Po from those emitted by 218Po and 222Rn, the detector must register only α-particles with energies between 6.2 and 7.5 MeV. The required energy response is obtained only if a removed layer of about 43 μm is achieved in a chemical etching of the detector. The methodology used to determine the etching conditions is described in this paper. The optimum conditions found are: a) chemical etching for 6 h at a temperature of 40°C, using 7.5 M KOH mixed with 50% ethanol as an etchant, and b) electrochemical etching for 1 h at a frequency of 3 kHz and an electric field strength of 34 kV cm−1. Several dosimeters have exposed during 2 months in dwellings located in the Barcelona area, Spain. A 214Po averaged concentration of (13.6 ± 8.6) Bq m−3 was obtained. |
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Keywords: | Makrofol-DE detector 214Po concentration α -particles energy response |
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