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:
y factor adjusts the absorbed dose because not all types of ionizing radiation create the same effect on human tissue. For example, a dose equivalent of one SIEVERT (Sv) requires 1 Gy of beta or gamma radiation, but only 0.05 Gy of alpha radiation or 0.1 Gy of neutron radiation. Because the sievert is a large unit, radiation doses often are expressed in milliSIEVERTS (mSv). See TOTAL EFFECTIVE DOSE EQUIVALENT. duplicate, field: Two samples of the same material, collected at the same location at the same time and under the same conditions, which are used to verify representativeness of the sampled material. duplicate, laboratory: Two ALIQUANTS of a SAMPLE, which are prepared and analyzed separately as part of the same batch, used in the laboratory to measure the overall PRECISION of the sample measurement process, beginning with laboratory subsampling of a field SAMPLE. field duplicate: See DUPLICATE, FIELD. graded approach: A process of basing the level of management controls applied to an item or work on the intended use of the results and the degree of confidence needed in the quality of the results. The NRC follows a graded approach to project planning and QUALITY ASSURANCE because of the diversity of environmental data collection activities. This diversity in the type of project and the data to be collected impacts the content and extent of the detail to be presented in the project planning documents. gray (Gy): The International System of Units (SI) unit for absorbed radiation dose. One Gy is 1 joule of energy absorbed per kilogram of matter, equal to 100 RAD. See SIEVERT. laboratory control sample: A standard material of known composition or an artificial SAMPLE (created by fortification of a clean material similar in nature to the sample), which is prepared and analyzed in the same manner as the sample. In an ideal situation, the result of an analysis of the laboratory control sample should be equivalent to (give 100 percent of) the TARGET ANALYTE