Standard Guide for Use of Modeling for Passive Gamma Measurements

Importancia y uso:

5.1 The following methods assist in demonstrating regulatory compliance in such areas as safeguards (Special Nuclear Material), inventory control, criticality control, decontamination and decommissioning, waste disposal, holdup and shipping.

5.2 This guide can apply to the assay of radionuclides in containers, whose gamma-ray absorption properties can be measured or estimated, for which representative certified standards are not available. It can be applied to in situ measurements, measurement stations, or to laboratory measurements.

5.3 Some of the modeling techniques described in the guide are suitable for the measurement of fall-out or natural radioactivity homogenously distributed in soil.

5.4 Source-based efficiency calibrations for laboratory geometries may suffer from inaccuracies due to gamma rays being detected in true coincidence. Modeling can be an advantage since it is unaffected by true coincidence summing effects.

Subcomité:

C26.10

Referida por:

C1592_C1592M-21

Volúmen:

12.01

Número ICS:

17.240 (Radiation measurements)

Palabras clave:

efficiency calibration; far-field approximation; generalized geometry holdup; infinite plane; nondestructive assay; radiation transport modeling; spectroscopy; voxel-intrinsic efficiency;