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Title: Physical and mathematical description of Nuclear Weapons Identification System (NWIS) signatures

This report describes all time and frequency analysis parameters measured with the new Nuclear Weapons Identification System (NWIS) processor with three input channels: (1) the {sup 252}Cf source ionization chamber; (2) a detection channel; and (3) a second detection channel for active measurements. An intuitive and physical description of the various functions is given as well as a brief mathematical description and a brief description of how the data are acquired. If the full five channel capability is used, the number of functions increases in number but not in type. The parameters provided by this new NWIS processor can be divided into two general classes: time analysis signatures including multiplicities and frequency analysis signatures. Data from measurements with an 18.75 kg highly enriched uranium (93.2 wt%, {sup 235}U) metal casting for storage are presented to illustrate the various time and frequency analysis parameters.
Authors:
; ; ;  [1]
  1. Oak Ridge National Lab., TN (United States)
Publication Date:
OSTI Identifier:
665856
Report Number(s):
Y/LB--15946-R2
ON: DE98054348; TRN: 99:000027
DOE Contract Number:
AC05-84OR21400
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 26 Sep 1997
Research Org:
Oak Ridge Y-12 Plant, TN (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 05 NUCLEAR FUELS; NUCLEAR WEAPONS; DETECTION; PATTERN RECOGNITION; URANIUM 235; PLUTONIUM; DELAYED NEUTRON ANALYSIS; RADIOISOTOPE SCANNERS; PERFORMANCE