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Double-filter monitor for simultaneous measurement of Radon and its progeny.

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Title: Double-filter monitor for simultaneous measurement of Radon and its progeny.
Authors: Mishra, Rosaline1,2 (AUTHOR) rosaline@barc.gov.in, Prajith, R.1 (AUTHOR), Rout, R.P.1 (AUTHOR), Jalaluddin, S.1 (AUTHOR), Khan, A.1 (AUTHOR), Sapra, B.K.1,2 (AUTHOR)
Source: Applied Radiation & Isotopes. Nov2025, Vol. 225, pN.PAG-N.PAG. 1p.
Subjects: Radon detectors, Alpha decay, Nuclear counters, Measuring instruments, Nuclear track detectors
Abstract: For simultaneous measurement of radon and its progeny, double filter monitor based on Direct progeny sensors (DRPS) was developed. DRPS is an absorber mounted LR115 detector which measures the progeny concentration. Double filter consisted of two filters, inlet and exit filter, which were utilised in the monitor for progeny atom deposition such that the ambient progeny atoms get deposited on the inlet filter and the progeny formed due to decay of radon sampled inside the delay volume get deposited on the exit filter. DRPS facing the inlet filter would detect the alpha particles emitted during decay of progeny on inlet filter and that will correspond to ambient progeny concentration. Similarly DRPS placed facing the exit filter will detect the alpha particles emitted during the decay of progeny on exit filter, which is related to ambient radon concentration. Thus the system has two filters and two progeny sensors. The loss of progeny atoms formed during the decay of ingressed radon inside the delay chamber may be lost due to plate-out on the walls of the delay chamber. The plate-out loss is characterised by diffusion parameter. Theoretical calculations of transit time of progeny atoms in the delay volume at different flow rates were also used to study the effect of volume of the chamber at different flow rates. The system was calibrated in known activities of radon and its progeny and the calibration factors were measured. Additional advantage of the system is that in-situ equilibrium factor can be measured. • Double filter technique for simultaneous measurement of Radon and is progeny. • In-situ Equilibrium factor estimation. Passive technique using SSNTD [ABSTRACT FROM AUTHOR]
Copyright of Applied Radiation & Isotopes is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 187530493
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Double-filter monitor for simultaneous measurement of Radon and its progeny.
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  Data: <searchLink fieldCode="AR" term="%22Mishra%2C+Rosaline%22">Mishra, Rosaline</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> rosaline@barc.gov.in</i><br /><searchLink fieldCode="AR" term="%22Prajith%2C+R%2E%22">Prajith, R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rout%2C+R%2EP%2E%22">Rout, R.P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jalaluddin%2C+S%2E%22">Jalaluddin, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khan%2C+A%2E%22">Khan, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sapra%2C+B%2EK%2E%22">Sapra, B.K.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Applied+Radiation+%26+Isotopes%22">Applied Radiation & Isotopes</searchLink>. Nov2025, Vol. 225, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Radon+detectors%22">Radon detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Alpha+decay%22">Alpha decay</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+counters%22">Nuclear counters</searchLink><br /><searchLink fieldCode="DE" term="%22Measuring+instruments%22">Measuring instruments</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+track+detectors%22">Nuclear track detectors</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: For simultaneous measurement of radon and its progeny, double filter monitor based on Direct progeny sensors (DRPS) was developed. DRPS is an absorber mounted LR115 detector which measures the progeny concentration. Double filter consisted of two filters, inlet and exit filter, which were utilised in the monitor for progeny atom deposition such that the ambient progeny atoms get deposited on the inlet filter and the progeny formed due to decay of radon sampled inside the delay volume get deposited on the exit filter. DRPS facing the inlet filter would detect the alpha particles emitted during decay of progeny on inlet filter and that will correspond to ambient progeny concentration. Similarly DRPS placed facing the exit filter will detect the alpha particles emitted during the decay of progeny on exit filter, which is related to ambient radon concentration. Thus the system has two filters and two progeny sensors. The loss of progeny atoms formed during the decay of ingressed radon inside the delay chamber may be lost due to plate-out on the walls of the delay chamber. The plate-out loss is characterised by diffusion parameter. Theoretical calculations of transit time of progeny atoms in the delay volume at different flow rates were also used to study the effect of volume of the chamber at different flow rates. The system was calibrated in known activities of radon and its progeny and the calibration factors were measured. Additional advantage of the system is that in-situ equilibrium factor can be measured. • Double filter technique for simultaneous measurement of Radon and is progeny. • In-situ Equilibrium factor estimation. Passive technique using SSNTD [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Radiation & Isotopes is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.apradiso.2025.112006
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Radon detectors
        Type: general
      – SubjectFull: Alpha decay
        Type: general
      – SubjectFull: Nuclear counters
        Type: general
      – SubjectFull: Measuring instruments
        Type: general
      – SubjectFull: Nuclear track detectors
        Type: general
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      – TitleFull: Double-filter monitor for simultaneous measurement of Radon and its progeny.
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            NameFull: Mishra, Rosaline
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            NameFull: Prajith, R.
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            NameFull: Rout, R.P.
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            NameFull: Khan, A.
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            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
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              Value: 225
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