title: Standardization and decay data of 237Np.
abstract: This paper reports contributions from participants in the EUROMET project (No. 416) which was entitled "237Np research into problems relating to purification, characterization and standardization". Primary standardizations were made by the defined low solid angle, coincidence, 4pi alpha, 2pi alpha and liquid scintillation counting methods. Secondary standardizations were made with calibrated gamma-ray spectrometers. Absolute X-ray, gamma-ray and alpha-particle emission probabilities were also determined. The results for the successful conclusion of both primary and secondary standardization are presented together with the values for alpha-particle and gamma-ray emission probabilities determined in this exercise. Several significant inconsistencies remain with the gamma-ray emission probabilities, and these are highlighted.
authors.affiliation: Centre for Ionising Radiation Metrology, National Physical Laboratory, Teddington, Middlesex, United Kingdom.
authors.forename: M J
authors.initials: MJ
authors.lastname: Woods
authors.forename: D H
authors.initials: DH
authors.lastname: Woods
authors.forename: S A
authors.initials: SA
authors.lastname: Woods
authors.forename: L J
authors.initials: LJ
authors.lastname: Husband
authors.forename: S M
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authors.lastname: Jerome
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authors.lastname: Michotte
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authors.lastname: Ratel
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authors.lastname: Crespo
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authors.lastname: Garcia-Torano
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authors.lastname: Rodriguez
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authors.initials: A
authors.lastname: Luca
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authors.lastname: Denecke
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authors.lastname: Sibbens
authors.forename: J
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authors.lastname: Morel
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authors.lastname: Etcheverry
authors.forename: D
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authors.lastname: Santry
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authors.lastname: Janssen
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authors.lastname: Schönfeld
authors.forename: U
authors.initials: U
authors.lastname: Schötzig