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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
22/02/1995 |
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Data da última atualização: |
22/02/1995 |
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Autoria: |
BAVEL, C. H. M. van; NIELSEN, D. R.; DAVIDSON, J. M. |
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Título: |
Calibration and characteristics of two neutron moisture probes. |
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Ano de publicação: |
1961 |
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Fonte/Imprenta: |
Soil Science Society of America Proceedings, v.25, n.5, p.329-334, 1961. |
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Idioma: |
Inglês |
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Notas: |
Separata |
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Conteúdo: |
The effect of the size of cylindrical containers filled with soil on the calibration of two types of neutron probes was investigated for moisture contents up to 0.25 volume fraction. Neutron count rates were appreciably affected by the value of both diameter and height up to 3 feet. Differences between 3 and 4 feet were small.The response of the end-source probe was linear within the range investigated (0 to 0,40 volume fraction). The data also show that the end-source probe design ascompared with the centered-source design is more efficient and, therefore, requires a smaller radioactive source for equal precision. once an accurate calibration with soil is available, verifying calibration of probes may be done with NaCl or H3BO3 solutions, limited to probesof identical design but differing efficiencies or source strenghts. Relations found between soil moisture content and solution concentration are given. A discussion of the range of measurement of soil moisturecontent with neutron probe is presented, comparing various literature data. |
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Palavras-Chave: |
Calibracao; Caracteristicas; Sonda de neutron. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01599naa a2200193 a 4500
001 1074593
005 1995-02-22
008 1961 bl --- 0-- u #d
100 1 $aBAVEL, C. H. M. van
245 $aCalibration and characteristics of two neutron moisture probes.
260 $c1961
500 $aSeparata
520 $aThe effect of the size of cylindrical containers filled with soil on the calibration of two types of neutron probes was investigated for moisture contents up to 0.25 volume fraction. Neutron count rates were appreciably affected by the value of both diameter and height up to 3 feet. Differences between 3 and 4 feet were small.The response of the end-source probe was linear within the range investigated (0 to 0,40 volume fraction). The data also show that the end-source probe design ascompared with the centered-source design is more efficient and, therefore, requires a smaller radioactive source for equal precision. once an accurate calibration with soil is available, verifying calibration of probes may be done with NaCl or H3BO3 solutions, limited to probesof identical design but differing efficiencies or source strenghts. Relations found between soil moisture content and solution concentration are given. A discussion of the range of measurement of soil moisturecontent with neutron probe is presented, comparing various literature data.
653 $aCalibracao
653 $aCaracteristicas
653 $aSonda de neutron
700 1 $aNIELSEN, D. R.
700 1 $aDAVIDSON, J. M.
773 $tSoil Science Society of America Proceedings$gv.25, n.5, p.329-334, 1961.
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Registro original: |
Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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