DQM Check for Radio Chemistry Relative Error Ratio

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EQuIS 7  >>  Professional > Modules > DQM > DQM Checks >

DQM Check for Radio Chemistry Relative Error Ratio

The DQM Check for Radio Chemistry Relative Error Ratio checks for relative error ratio values for field duplicate sample radio chemistry results that fall outside QC limits.

 

It is important that RT_MATRIX.MEDIUM_CODE be populated for this check to work properly. (Note that DT_RESULT_QC is not used for this check).

 

Check name is EarthSoft.DQM.RadChemRelativeErrorRatio = Radiochemistry Relative Error Ratio.

 

This check uses the REPORTABLE_RESULT, RESULT_TYPE_CODE and TEST_BATCH_TYPE parameters from Global Parameters. There are six other parameters:

Medium_code_soil – RT_MATRIX.MEDIUM_CODE for DT_SAMPLE.MATRIX_CODE for soil samples. Defaults to "Soil".

Medium_code_water – RT_MATRIX.MEDIUM_CODE for DT_SAMPLE.MATRIX_CODE for water samples. Defaults to "Water".

Rer_control_limit_other – RPD control limit for other samples. Defaults to 1.

Rer_control_limit_soil – RPD control limit for soil samples. Defaults to 1.

Rer_control_limit_water – RPD control limit for water samples. Defaults to 1.

Sample_type_RadChem_Dup – Defaults to FD.

 

Notes:

The default value is used if there is no record in RT_DQM_CHECK_PARAM for an input parameter.

The default value is used if the PARAM_VALUE is NULL for this parameter in RT_DQM_CHECK_PARAM.

 

There are two rules:

1.RELATIVE ERROR RATIO > CL

2.RELATIVE ERROR RATIO > CL NON_DETECT

 

The rules are processed the same way, but the qualifier for the first rule is applied to results with a detected concentration, and the qualifier for rule two is applied to non-detect results.

Process all results with DT_SAMPLE.SAMPLE_TYPE = SAMPLE_TYPE_RADCHEM_DUP.

Find the parent sample using DT_SAMPLE.PARENT_SAMPLE_CODE or if that value is NULL, then use DT_FIELDQC_BATCH_PARTNER.QC_SAMPLE_ID.

Lookup MEDIUM_CODE = RT_MATRIX.MEDIUM_CODE for DT_SAMPLE.MATRIX_CODE.

Calculate RER = |S - R| / ((S.TPU(1 sigma))^2 + (R.TPU(1 sigma))^2)^0.5 and:

Where S and R = DT_SAMPLE.RESULT_NUMERIC for the sample and the replicate, respectively, and

If DT_RESULT.UNCERTAINTY = "2 sigma", then TPU = DT_RESULT.RESULT_ERROR_DELTA / 1.96.

Otherwise, if DT_RESULT.UNCERTAINTY = "1 sigma", then TPU = DT_RESULT.RESULT_ERROR_DELTA.

 

Then process as follows:

If MEDIUM_CODE = MEDIUM_CODE_SOIL, then qualify the results if RER  > RER_CONTROL_LIMIT_SOIL.

If MEDIUM_CODE = MEDIUM_CODE_WATER, then qualify the results if RER > RER_CONTROL_LIMIT_WATER.

Otherwise, if MEDIUM_CODE is different or NULL, qualify the results if RER > RER_CONTROL_LIMIT_OTHER.