Data/hora: 23/06/2024 14:15:14

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	22/02/1995	
Data da última atualização: 	22/02/1995	
Autoria: 	BAVEL, C. H. M. van; NIELSEN, D. R.; DAVIDSON, J. M.	
Título: 	Calibration and characteristics of two neutron moisture probes.	
Ano de publicação: 	1961	
Fonte/Imprenta: 	Soil Science Society of America Proceedings, v.25, n.5, p.329-334, 1961.	
Idioma: 	Inglês	
Notas: 	Separata	
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.	
Palavras-Chave: 	Calibracao; Caracteristicas; Sonda de neutron.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (3674-1) - EMB - SP - -- -  -  - 1995.00019 - DIS