Features
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Combines Multiple Assay Techniques
- Quantitative and Isotopic Gamma-Ray Analysis
- Passive Neutron Multiplicity Coincidence Counting
- Active Neutron Interrogation using Differential Die- Away Technique (DDA)
- 200 liter (55 gallon) drums and 320 liter (85 gallon) Over-Packs
- MDAs of less than 30 nCi/g
- Fully Automated Operation and Analysis
- 27% Efficiency for 240Pu fission neutrons
- 2.8% Active Mode Detection Efficiency
- Multiple HRGS Detectors
- 108 neutron/second Zetatron
- AAS based Active Neutron Mode Moderator Correction
- NDA 2000 Non-Destructive Analysis Software
- Operates under Windows® NT®/2000
Introduction
IWAS, CANBERRA’s Integrated Waste Assay System, is designed to quantify plutonium
and uranium in 55 gallon drums and 85 gallon over-packs. The IWAS provides
passive and active neutron interrogation and quantitative gamma analysis,
allowing rapid characterization of TRU wastes for proper shipment and disposal.
The IWAS provides a complete NDA instrumentation suite in a single assay
cavity. The system offers performance, speed and ease of use while using a
fraction of the floor space of three independent systems. The IWAS is based
on the CANBERRA High Efficiency Neutron Counter (HENC) design with integrated
Differential Die-Away (DDA) and High Resolution Gamma-Ray Systems. Results
from individual assay modes are combined automatically by the NDA 2000 software
to provide the best result for the sample. Because all assays are performed
by the same system in a single assay sequence, there is no confusion over
item ID or modification of drum contents between assays.
The system is designed to be operated as an automated counting system which
can process batches of drums, or can be incorporated in a facility process
line. The following sections describe the various assay sub-systems, hardware,
software and indicate typical performance characteristics.
