DOE Test Method CHEM-TP-SR.06

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View Actual DOE Method CHEM-TP-SR.06 (PDF File)


Source:
DOE

Method Name:
Sr-89 and Sr-90 in Liquid Radioactive Wastes or Waters by Beta Counting. Official Name: Sulfate Method for Sr-89 and Sr-90 in Liquid Radioactive Wastes or Waters

Description:
Strontium sulfate (SrSO4) is precipitated and then dissolved in a EDTA solution. SrSO4 is preferentially precipitated from EDTA and a lower pH. The sulfate precipitate is metathesized to a carbonate. After barium is separated as a chromate, the Sr is reprecipitated as a sulfate. Total radioactive Sr is determined by beta counting the SrSO4. The strontium sample is then dissolved in EDTA and set aside for Y-90 ingrowth. After a suitable ingrowth period, Y-90 is separated and counted on Y2(C2O4)3 - 9H2O. The Sr-90 is determined by beta counting its Y-90 daughter. Sr-89 is determined as the difference between total radioactive Sr and Sr-90.

Scope:
This procedure is applicable to samples that must be analyzed for Sr-89, 90 in liquid radioactive wastes or waters and for samples that must be decontaminated from Ba-140.

Citation:
Dept. of Energy RESL Technical Procedure

Interferences:
None given.

QC Requirements:
QC procedures based on internal laboratory requirements for radiochemical analysis.

Maximum Holding Time:
None given.

Media:
OTHER

Subcategory:
Radiochemical

Concentration:
None given.

Precision:
The yields ranged from 85-95% for Sr-90 and 90-100% for Y-90. Volumes of sample tested ranged from 0.010 to 0.4 L. Precision and accuracy are relative uncertainty values used in the calculation of Sr-89 and Sr-90.

Detection:
Counting efficiency for Sr-90 (SrSo4) is 0.21, Y-90 (SrSO4) is 0.44, Y-90 [Y2(OX)3] is 0.450 - 0.455, and Sr-89 (SrSO4) is 0.39.

Revision Number:
Jun-99



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