DOE Test Method CHEM-TP-Ni.1


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PDF IconView Actual DOE Method CHEM-TP-Ni.1 (PDF File)


Source:
DOE

Method Name:
Ni-63 in Water by Liquid Scintillation Counting. Official Name: Ni-63 in Water

Description:
Nickel-63 (Ni-63) is an activation product and pure beta emitter that must be chemically separated from interfering radionuclides prior to counting. Radioactive nickel and the added nickel carrier are separated from most of the interfering impurities by using iron hydroxide as a scavenger. Further decontamination is provided by several nickel dimethylglyoxime (DMG) precipitations. The purified nickel is heated to formation of the black nickel oxide which is weighed to measure the chemical yield of the process. The oxide is dissolved and the Ni-63 is counted by liquid scintillation.

Scope:
This procedure determines Ni-63 after its chemical separation from environmental waters and various liquids collected at nuclear reactor facilities.

Citation:
Dept. of Energy RESL Technical Procedure

Interferences:
(A) Presence of palladium and hafnium: Palladium, hafnium, and their radioactive isotopes, if present in large quantities may give a high yield.(B) Presence of organic compounds: When nickel is complexed by organic compounds such as EDTA, these must be destroyed to obtain quantitative precipitation of nickel as nickel dimethylglyoxime.

QC Requirements:
A reagent blank must be included with each set of samples analyzed. A Ni-63 std must also be prepared and counted to determine of the counting efficiency of each set of samples. Correct performance of the liquid scintillation counter must be verified by an Instrument Performance Analysis (IPA).

Maximum Holding Time:
None given.

Media:
WATER

Subcategory:
Radiochemical

Concentration:
None given.

Precision:
-

Detection:
Lower limit and upper limit are for liquid scintillation spectrometer region settings in keV for counting Nickel-63 including Ni-63 counting region, alternative Ni-63 counting region, monitoring of other activity region.

Revision Number:
Apr-99

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