Response of direct thoron progeny sensors (DTPS) to various aerosol concentrations and ventilation rates
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| Title: | Response of direct thoron progeny sensors (DTPS) to various aerosol concentrations and ventilation rates |
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| Authors: | Mishra, Rosaline1, Prajith, R.1, Sapra, B.K.1, Mayya, Y.S. mayyays@barc.gov.in |
| Source: | Nuclear Instruments & Methods in Physics Research Section B. Mar2010, Vol. 268 Issue 6, p671-675. 5p. |
| Subjects: | Nuclear track detectors, Thoron, Aerosols, Absorption, Nuclear physics, Nuclear models |
| Abstract: | Abstract: Direct thoron/radon progeny sensors (DTPS/DRPS) are absorber mounted LR115 type track detectors for measuring the time-averaged progeny concentrations. Through a large number of experiments, the sensitivity factor of these sensors in natural indoor environment was found to be nearly constant at a value of 0.94Trcm−2 d−1/EETC (Bqm−3) for DTPS and 0.09Trcm−2 d−1/EERC (Bqm−3) for DRPS. The constancy of the sensitivity factor in the natural environments is attributed primarily to the presence of large aerosol concentrations and relatively low ventilation rates in time-averaged measurements. However, detailed model calculations suggest that in extreme scenario i.e. at high ventilation rate and low aerosol concentrations, the sensitivity factor can be quite different. Such situations are likely to occur in occupational plant areas. Therefore systematic chamber experiments were carried out to using DTPS, to estimate the variability of the sensitivity factor in these extreme conditions. In the first set, the sensitivity factor of DTPS was measured in 6 different aerosol concentrations at zero ventilation rates. The sensitivity factor showed a steep decrease as the aerosol concentration increased to about 8554particlecm−3, after which it remained almost constant with increase in aerosol concentration. The second set of experiments was conducted at ∼5000particlescm−3 at three different ventilation rates. The sensitivity factor was found to increase with increase in ventilation rate. The results are further discussed. [Copyright &y& Elsevier] |
| Copyright of Nuclear Instruments & Methods in Physics Research Section B is the property of Elsevier B.V. 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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 48467973 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Response of direct thoron progeny sensors (DTPS) to various aerosol concentrations and ventilation rates – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mishra%2C+Rosaline%22">Mishra, Rosaline</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Prajith%2C+R%2E%22">Prajith, R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sapra%2C+B%2EK%2E%22">Sapra, B.K.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mayya%2C+Y%2ES%2E%22">Mayya, Y.S.</searchLink><i> mayyays@barc.gov.in</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nuclear+Instruments+%26+Methods+in+Physics+Research+Section+B%22">Nuclear Instruments & Methods in Physics Research Section B</searchLink>. Mar2010, Vol. 268 Issue 6, p671-675. 5p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Nuclear+track+detectors%22">Nuclear track detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Thoron%22">Thoron</searchLink><br /><searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Absorption%22">Absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+physics%22">Nuclear physics</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+models%22">Nuclear models</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Direct thoron/radon progeny sensors (DTPS/DRPS) are absorber mounted LR115 type track detectors for measuring the time-averaged progeny concentrations. Through a large number of experiments, the sensitivity factor of these sensors in natural indoor environment was found to be nearly constant at a value of 0.94Trcm−2 d−1/EETC (Bqm−3) for DTPS and 0.09Trcm−2 d−1/EERC (Bqm−3) for DRPS. The constancy of the sensitivity factor in the natural environments is attributed primarily to the presence of large aerosol concentrations and relatively low ventilation rates in time-averaged measurements. However, detailed model calculations suggest that in extreme scenario i.e. at high ventilation rate and low aerosol concentrations, the sensitivity factor can be quite different. Such situations are likely to occur in occupational plant areas. Therefore systematic chamber experiments were carried out to using DTPS, to estimate the variability of the sensitivity factor in these extreme conditions. In the first set, the sensitivity factor of DTPS was measured in 6 different aerosol concentrations at zero ventilation rates. The sensitivity factor showed a steep decrease as the aerosol concentration increased to about 8554particlecm−3, after which it remained almost constant with increase in aerosol concentration. The second set of experiments was conducted at ∼5000particlescm−3 at three different ventilation rates. The sensitivity factor was found to increase with increase in ventilation rate. The results are further discussed. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nuclear Instruments & Methods in Physics Research Section B is the property of Elsevier B.V. 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: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.nimb.2009.12.012 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 5 StartPage: 671 Subjects: – SubjectFull: Nuclear track detectors Type: general – SubjectFull: Thoron Type: general – SubjectFull: Aerosols Type: general – SubjectFull: Absorption Type: general – SubjectFull: Nuclear physics Type: general – SubjectFull: Nuclear models Type: general Titles: – TitleFull: Response of direct thoron progeny sensors (DTPS) to various aerosol concentrations and ventilation rates Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mishra, Rosaline – PersonEntity: Name: NameFull: Prajith, R. – PersonEntity: Name: NameFull: Sapra, B.K. – PersonEntity: Name: NameFull: Mayya, Y.S. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 03 Text: Mar2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 0168583X Numbering: – Type: volume Value: 268 – Type: issue Value: 6 Titles: – TitleFull: Nuclear Instruments & Methods in Physics Research Section B Type: main |
| ResultId | 1 |
