Comparison: Co-60 Absorbed Dose for High-Dose Dosimetry | NIST

The National Institute of Standards and Technology (NIST) participated in an international comparison of standards for absorbed dose to water for 60Co gamma radiation at radiation-processing dose levels. The comparison was organized by the Bureau International des Poids et Mesures (BIPM) and involved eight laboratories from various countries. NIST led a comparison beforehand to demonstrate recommended modifications to the BIPM protocol.

The modifications were based on NIST’s recent discovery of a previously unknown dose rate effect in alanine, which had its greatest impact on National Measurement Institute (NMI) metrology. The discovery of this effect and its contribution to international comparison data demonstrates the quality of NIST’s measurement capabilities and associated facilities, resulting from the quality system implemented at NIST in the last decade.

The national standards for absorbed dose to water in 60Co gamma radiation at the dose levels used in radiation processing were compared over the range from 1 kGy to 30 kGy using the alanine dosimeters from NIST and NPL. It was found that the national standards are generally in agreement within their standard uncertainties (1-2 parts in 10²).

Source: https://www.nist.gov/programs-projects/comparison-co-60-absorbed-dose-high-dose-dosimetry

Keywords: quantum sensing, metrology, enable technologies

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