ANGLE Advanced Efficiency Calibration for HPGe Radiation Detectors
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ANGLE 4 Advanced Gamma Spectroscopy Efficiency Calibration Software dat-waso.o as^evio.o edoeidio.o “Compatible, Efficient, and Defendable Calibrations for Gamma Spectroscopy Applications.” ADVANCED MEASUREMENT TECHNOLOGY

ANGLE 4 ANGLE is an advanced efficiency calculation application for High Purity Germanium and Sodium Iodide detectors based on the concept of Efficiency Transfer. This method combines the measured efficiency of a known reference configuration and solid angle models to derive the efficiency for different containers, sample materials, and sample positions. This semi-empirical approach is more accurate than pure mathematical models due to large errors than can be imposed by detector characteristics that are not precisely known – such as crystal defects, contact thickness, and dead layers – as...

Detector, Container, Matrix, and Position Models Reference Configuration and Measured Efficiency Calculated Efficiency Calculation results Output file: ANGLE 4 Calculation Report Preview: Detector Geometry nam Source height: Source volume: Source material: Output file: 55-P42871A 20ec Vial 1 in to 11 Marinelli.outx Detector name: GEM40-83-JCS_55-P42871A Container name: XL Marinelli (1320} Geometry name: No holder Source height: 95 mm Source radius: 70.5 mm Source volume: 1.483 I Source material: Water Number of energies: 11 Reference efficiency curve: 55-P42871A 20ml Vial at 1 Number of...

ANGLE 4 Detector Model The Detector Model defines the physical construction of the detector. The input parameters are dependent on the detector type which may be Germanium or Sodium Iodide in Coaxial, Planar, or Well configurations. A graphic display of each model helps validate the appropriate detector type in the configuration process. Some parameters, such as the Inactive material thickness and the Contact thickness, are usually not precisely known for each detector so nominal values are typically used. These minor deviations are typically inconsequential with the Efficiency Transfer...

ANGLE 4 Container and Source Model Containers define the physical holders of source or sample material, and Sources define the actual material within the container. Containers and Sources are defined independently in ANGLE to simplify the process of establishing different combinations of material and volume in each container. Common materials are pre-defined for Containers and Sources, and additional materials can easily be added based on user-defined compounds or mixtures. Container Types:  Marinelli  Cylinder to define Point Source, Filter Paper, Disk, Charcoal Cartridge, and Bottles...

ANGLE 4 Reference Efficiency Calibration ANGLE eliminates complex, expensive, and time consuming detector characterization because the Reference Calibration can be determined by direct measurement of a known source within the lab. Optimally, the Reference Calibration is determined using a source/geometry that is similar to the one being modeled in order to minimize uncertainty in the modeled efficiency; however, any source/geometry can be used as the reference when modeling any other source/geometry with good results when all of the detector and source/geometry configuration parameters are...

ANGLE 4 Calculated Efficiency ANGLE uses an Efficiency Transfer method, which is a semi-empirical approach comprised of experimental evidence (i.e. measured efficiency of a known reference source) and mathematical comparison of effective solid angle modeling for the reference and target configurations. The precision of the effective solid angle models is based on the number of integration segments over the source volume and detector surface visible to the source, and is easily adjustable to optimize calibration accuracy versus calculation time. The derived efficiency data can be comprised...

ANGLE 4 Ordering Information Model ANGLE-BW ANGLE-UW ANGLE-GW Description Advanced Gamma Spectroscopy Efficiency Calibration Software Update from ANGLE-B32 (Version 2 or 3) to ANGLE-BW (Version 4) Additional Hard Copy Documentation for ANGLE References 1 and 2 are highly recommended to the interested reader. 1. ANGLE v2.1 — New version of the computer code for semiconductor detector gamma-efficiency calculations, S. Jovanovic, A. Dlabac and N. Mihaljevic, Nuclear Instruments and Methods in Physics Research Section A, doi:10.1016/j.nima.2010.02.058. Reliability of two calculation codes for...