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Related Experiment Videos

Standardization of a 89Sr solution from a BIPM intercomparison using a liquid scintillation method.

P A L Cruz1, J S Loureiro, E M O Bernardes

  • 1Instituto de Radioproteção e Dosimetria-LNMRI, Recreio, Brazil. palcruz@ird.gov.br

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|February 15, 2002
PubMed
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Standardizing 89Sr solutions using the CIEMAT/NIST method requires adding HCl to liquid scintillation cocktails for stability. This ensures accurate activity measurements in intercomparison studies.

Area of Science:

  • Radiochemistry
  • Analytical Chemistry
  • Metrology

Background:

  • Accurate standardization of radioactive solutions is crucial for international comparisons.
  • Liquid scintillation counting is a common technique for measuring low-energy beta emitters like 89Sr.
  • The stability of radioactive standards in scintillation cocktails can be affected by various factors.

Purpose of the Study:

  • To standardize 89Sr (strontium chloride) solutions using the CIEMAT/NIST method.
  • To evaluate the stability of 89Sr in three different liquid scintillation cocktails (Instagel Plus, HiSafe III, Ultima Gold).
  • To determine the optimal sample preparation method for stable 89Sr measurements.

Main Methods:

  • Application of the CIEMAT/NIST method for 89Sr standardization.

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  • Preparation of samples with and without the addition of hydrochloric acid (HCl).
  • Assessment of sample stability over time in liquid scintillation cocktails.

    • Main Results:

    • Good stability of 89Sr was achieved only when 0.5 ml of 0.1 mol/l HCl was added to the cocktails.
    • The determined activities per unit mass for 89Sr were 26.344 kBq/g (Instagel Plus), 26.335 kBq/g (HiSafe III), and 26.310 kBq/g (Ultima Gold).
    • A total uncertainty of 0.5% (k=1) was achieved for all measurements at the reference time (2000.10.01, 00 h UT).

    Conclusions:

    • The addition of HCl is essential for achieving stable 89Sr measurements in Instagel Plus, HiSafe III, and Ultima Gold cocktails.
    • The CIEMAT/NIST method, with appropriate sample preparation, provides reliable standardization of 89Sr solutions.
    • These findings contribute to the accuracy of international metrology comparisons involving 89Sr.