Analytical Suite Metadata

GSC Ottawa – laboratory gamma ray spectrometry



GSC Ottawa – laboratory gamma ray spectrometry

General Methodology:

The GSC maintains a laboratory spectrometer system for analysis of rock, till and soil samples.  The spectrometer system measures radioelement concentrations of potassium (%), equivalent uranium (ppm) and equivalent thorium (ppm). The term “equivalent” is used for U and Th concentrations as they are determined indirectly from their daughter products (214Bi and 208Tl respectively) that are assumed to be in equilibrium with their parent isotope. Potassium concentration is determined directly from 40K.

The spectrometer system is composed of two, lead-shielded, 14 cm by 14 cm NaI detectors.  Calibration of the spectrometer is accomplished using potassium (RGK-1), equivalent uranium (RGU-1), and equivalent thorium (RGTh-1) standards recognized by the International Atomic Energy Agency.  The laboratory utilizes 8-oz (400mm x 102mm) shallow, seamless steel cans.  The can is lined with plastic wrap to prevent trace element contamination from the sample can in the event that subsequent chemical analysis is required.  Each sample can is completely filled with bulk (all size fractions), air dried sample material.  The weight of the sample can, empty and full is recorded.  The can is then sealed and stored for 21 days to allow the radon and 214Bi to reach equilibrium.

[description taken from GSC Open File 6433]

Instrument: unstated

Sample material: gas

Sample weight: unstated


Analytical Technique:

Hierarchical classification

Technique >> Radiochemical methods >> Natural radiation >> Gamma radiation

Children

None


Analytical Decomposition:

Hierarchical classification

Decomposition >> None

Children

None


Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  2462     K_lab 
2  2463     eU_lab 
3  2464     eTh_lab 
4  2465     Wt_lab 

Associated Analytical Packages:

IndexPackage IDPackage Name
1  267     GSC lab measurement – gamma ray spectrometry
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