Model for radon diffusion through the lunar regolith
Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path....
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1972 |
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| Umfang: |
11 |
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| Reproduktion: |
Springer Online Journal Archives 1860-2002 |
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| Übergeordnetes Werk: |
in: Earth, moon and planets - 1969, 3(1972) vom: Apr., Seite 461-471 |
| Übergeordnetes Werk: |
volume:3 ; year:1972 ; month:04 ; pages:461-471 ; extent:11 |
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| 245 | 1 | 0 | |a Model for radon diffusion through the lunar regolith |
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| 520 | |a Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. | ||
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(DE-627)NLEJ195199596 DE-627 ger DE-627 rakwb eng Model for radon diffusion through the lunar regolith 1972 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. Springer Online Journal Archives 1860-2002 Friesen, L. J. oth Heymann, D. oth in Earth, moon and planets 1969 3(1972) vom: Apr., Seite 461-471 (DE-627)NLEJ188984453 (DE-600)1472717-1 1573-0794 nnns volume:3 year:1972 month:04 pages:461-471 extent:11 http://dx.doi.org/10.1007/BF00562466 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 3 1972 4 461-471 11 |
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(DE-627)NLEJ195199596 DE-627 ger DE-627 rakwb eng Model for radon diffusion through the lunar regolith 1972 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. Springer Online Journal Archives 1860-2002 Friesen, L. J. oth Heymann, D. oth in Earth, moon and planets 1969 3(1972) vom: Apr., Seite 461-471 (DE-627)NLEJ188984453 (DE-600)1472717-1 1573-0794 nnns volume:3 year:1972 month:04 pages:461-471 extent:11 http://dx.doi.org/10.1007/BF00562466 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 3 1972 4 461-471 11 |
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(DE-627)NLEJ195199596 DE-627 ger DE-627 rakwb eng Model for radon diffusion through the lunar regolith 1972 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. Springer Online Journal Archives 1860-2002 Friesen, L. J. oth Heymann, D. oth in Earth, moon and planets 1969 3(1972) vom: Apr., Seite 461-471 (DE-627)NLEJ188984453 (DE-600)1472717-1 1573-0794 nnns volume:3 year:1972 month:04 pages:461-471 extent:11 http://dx.doi.org/10.1007/BF00562466 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 3 1972 4 461-471 11 |
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(DE-627)NLEJ195199596 DE-627 ger DE-627 rakwb eng Model for radon diffusion through the lunar regolith 1972 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. Springer Online Journal Archives 1860-2002 Friesen, L. J. oth Heymann, D. oth in Earth, moon and planets 1969 3(1972) vom: Apr., Seite 461-471 (DE-627)NLEJ188984453 (DE-600)1472717-1 1573-0794 nnns volume:3 year:1972 month:04 pages:461-471 extent:11 http://dx.doi.org/10.1007/BF00562466 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 3 1972 4 461-471 11 |
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(DE-627)NLEJ195199596 DE-627 ger DE-627 rakwb eng Model for radon diffusion through the lunar regolith 1972 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. Springer Online Journal Archives 1860-2002 Friesen, L. J. oth Heymann, D. oth in Earth, moon and planets 1969 3(1972) vom: Apr., Seite 461-471 (DE-627)NLEJ188984453 (DE-600)1472717-1 1573-0794 nnns volume:3 year:1972 month:04 pages:461-471 extent:11 http://dx.doi.org/10.1007/BF00562466 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 3 1972 4 461-471 11 |
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Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. |
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Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. |
| abstract_unstemmed |
Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results. |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">NLEJ195199596</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20210708003709.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">070526s1972 xx |||||o 00| ||eng c</controlfield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)NLEJ195199596</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Model for radon diffusion through the lunar regolith</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1972</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">11</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zzz</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">z</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zu</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract A model for radon diffusion through the lunar regolith is proposed in which the atom migrates by random walk. The regolith is represented by a system of randomly oriented baffles in which the mean distanced which the atom travels between two collisions takes on the role of a mean free path. The effective mean time between two collisions depends on two entities: the actual mean time-of-flight and the mean sticking time on grain surfaces for one collision. The latter depends strongly on the temperature and the heat of adsorption of radon on regolith materials. Bothd (mean free path) as well asQ (heat of adsorption) are either poorly known or unknown for the lunar regolith; hence these quantities are treated as free parameters. Because of the greatly different mean lifetimes against radioactive decay of219Rn,220Rn, and222Rn, the regolith acts as a powerful ‘filter’ for these species.222Rn escape is significant (32%) even ford = 1µ,Q = 7.0 kcal/mole and a regolith depth of 4 m. Calculations of radon escape from a 4 m thick regolith, usingd = 1, 10 and 80µ andQ = 4.0, 5.2 and 7.0 kcal/mole show that the222Rn/220Rn escape ratio can be as small as 7.7 and as large as, or larger than 47. The small value of 7.7 is of particular interest, because it is nearly equal to the escape ratio inferred by Turkevichet al. from their Surveyor 5 results.</subfield></datafield><datafield tag="533" ind1=" " ind2=" "><subfield code="f">Springer Online Journal Archives 1860-2002</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Friesen, L. J.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Heymann, D.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">in</subfield><subfield code="t">Earth, moon and planets</subfield><subfield code="d">1969</subfield><subfield code="g">3(1972) vom: Apr., Seite 461-471</subfield><subfield code="w">(DE-627)NLEJ188984453</subfield><subfield code="w">(DE-600)1472717-1</subfield><subfield code="x">1573-0794</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:3</subfield><subfield code="g">year:1972</subfield><subfield code="g">month:04</subfield><subfield code="g">pages:461-471</subfield><subfield code="g">extent:11</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">http://dx.doi.org/10.1007/BF00562466</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-1-SOJ</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_NL_ARTICLE</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">3</subfield><subfield code="j">1972</subfield><subfield code="c">4</subfield><subfield code="h">461-471</subfield><subfield code="g">11</subfield></datafield></record></collection>
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