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Abstract

Reference materials of natural and isotopically enriched or depleted Li-2SO-4 are used for neutron cross section measurements. The detection limits of Sm, Eu, Gd, Dy and Cd in Li-2SO-4 by atomic emission spectroscopy (AES) and instrumental photon activation (IPA), correspond ? to a total contribution equivalent to the natural lithium (sigma = 70.5 barns), of 0.160% and 0.0213% respectively. MnSO-4 solutions are used for the calibration of neutron sources, e.g. 252-Cf. The direct analysis of Sm, Eu, Gd, Dy and Cd in MnSO-4 by AES and IPA, provides 52-EU/154Eu (1.11x10**5 Bq) is used to detection limits from which the total contributions equivalent to the manganese (sigma = 13.3 b), are respectively 2.38% and 0.395%. In order to improve the detection limits of Rare Earths, a method had been developed for the R.E./Mn chemical separation which is based on the coprecipitation of Rare Earths as fluorides by HF in the presence of ammonium after the addition of very pure Y as a carrier. A solution of monitor the recovery of the lanthanides. The Sc and Y are determined directly by AES or IPA. As an example, the contributions of Sm, Eu, Gd and Dy obtained by AES after the chemical separation of a solution containing 300 mg MnSO-4 per gram, are reduced to 0.0114%. The concentration of Cd found in this solution is 3.7 mug/g MnSO-4 and the total contribution of the 16 Rare Earths and Cd is <or= 0.107%.

Additional information

Authors: BERTHELOT CH, JRC GEEL ESTAB. (BELGIUM);ESCHBACH H L, JRC GEEL ESTAB. (BELGIUM);VERDINGH V, JRC GEEL ESTAB. (BELGIUM);HERRMANN S JRC GEEL ESTAB. (BELGIUM), JRC GEEL ESTAB. (BELGIUM)
Bibliographic Reference: EUR 10189 EN (1986) MF, 10 P., BFR 150, BLOW-UP COPY BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124090600 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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