Details

Autor(en) / Beteiligte

• Al-Azmi, D.
• Okeyode, I.C.
• Alatise, O.O.
• Mustapha, A.O.

Titel

Setup and procedure for routine measurements of radon exhalation rates of building materials

Ist Teil von

• Radiation measurements, 2018-05, Vol.112, p.6-10

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A practical procedure and the necessary setup for routine measurement of the exhalation rate of 222Rn from building materials are described. The setup comprises a continuous radon monitor, based on an ionization chamber, and a relatively large-volume accumulation chamber. The experimentalist can interact with the setup in real time via a PC. Therefore it is possible to determine the exhalation rates by determining the optimum accumulation time before the effects of back-diffusion and radon decay set in. This, in turn, reduces the time required to test a sample and makes the setup useful for routine measurements. The exhalation rate values (Bq m−2 h−1) for selected building materials made from gypsum, marble, ceramic, and granite were found to be 1.63, 2.29, 3.99 and 5.39 Bq m−2 h−1, respectively. The optimal test-times for the samples ranged from 9 to 19 h. •A practical procedure and necessary setup for radon free exhalation rates is presented.•The exhalation measurement procedure is fast and can be routinely carried out on building materials.•Classification of building materials using radiation performance indices for radon exhalation is proposed.