Document: NRC Regulatory Guide
Document ID: a5cfec96-8785-464b-ada8-dc4424b90606
Document Type: regulatory_guide
Title: Quality Assurance for Radiological Monitoring Programs
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0630/ML063060429.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.15
CFR Part: 
CFR Title: 

Content:
sentially free of the TARGET ANALYTE (the “unknown”), that is carried through the radiochemical preparation, analysis, mounting, and measurement process in the same manner as a routine sample of a given matrix. blind sample: A SAMPLE with a concentration not known to the analyst. Blind samples are used to assess analytical performance. A double-blind sample is a sample whose concentration and identity as a sample is known to the submitter, but not to the analyst. The analyst should treat the double-blind sample as a routine sample, so it is important that the double-blind sample is identical in appearance to routine samples. calibration: The set of operations that establish, under specified conditions, the relationship between values indicated by a measuring instrument or measuring system, or values represented by a material measure, and the corresponding known value of a parameter of interest. calibration source: A prepared SOURCE, made from a CERTIFIED REFERENCE MATERIAL OR STANDARD REFERENCE MATERIAL, that is used for calibrating instruments. certified reference material: A reference material, accompanied by a certificate, with one or more property values certified by a procedure that establishes its traceability to an accurate realization of the unit in which the property values are expressed, and for which each certified value is accompanied by an UNCERTAINTY at a stated level of confidence (ISO Guide 30, 1992). See STANDARD REFERENCE MATERIAL. chain of custody: Procedures that provide the means to trace the possession and handling of a sample from collection to data reporting. check source: A material used to validate the operability of a radiation measurement device, sometimes used for instrument quality control. See TEST SOURCE and SOURCE, RADIOACTIVE. conformance: An affirmative indication or judgment that a product or service has met the criteria of the relevant specifications, contract, or regulation; also the state of meeting the criteria (ANSI/ASQC