Known Sample
known samples of geological ma- terial are intentionally collected, typically from crime scene or alternate locations, for comparison to a questioned sample. 3.1.7.1 Discussion—Geological materials are typically more heterogeneous than manufactured materials, so a greater num- ber of known samples of geological material are needed to represent the range of variation (see Guide E3272). Reference sample and control sample are synonyms of known sample.
Committee
Trace Materials
Date Added to Lexicon
Standard Source (Designation Number Title of Standard. Publisher, Place, Year.)
ASTM E3294-23 Standard Guide for Forensic Analysis of Geological Materials by Powder X-Ray Diffraction. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2023.
Source link
Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org