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Title: ABSORPTION ANALYZER

A means was developed for continuously computing and indicating the isotopic assay of a process solution and for automatically controlling the process output of isotope separation equipment to provide a continuous output of the desired isotopic ratio. A counter tube is surrounded with a sample to be analyzed so that the tube is exactly in the center of the sample. A source of fast neutrons is provided and is spaced from the sample. The neutrons from the source are thermalized by causing them to pass through a neutron moderator, and the neutrons are allowed to diffuse radially through the sample to actuate the counter. A reference counter in a known sample of pure solvent is also actuated by the thermal neutrons from the neutron source. The number of neutrons which actuate the detectors is a function of a concentration of the elements in solution and their neutron absorption cross sections. The pulses produced by the detectors responsive to each neu tron passing therethrough are amplified and counted. The respective times required to accumulate a selected number of counts are measured by associated timing devices. The concentration of a particular element in solution may be determined by utilizing the following relation:more » T2/Ti = BCR, where B is a constant proportional to the absorption cross sections, T2 is the time of count collection for the unknown solution, Ti is the time of count collection for the pure solvent, R is the isotopic ratlo, and C is the molar concentration of the element to be determined. Knowing the slope constant B for any element and when the chemical concentration is known, the isotopic concentration may be readily determined, and conversely when the isotopic ratio is known, the chemical concentrations may be determined. (AEC)« less
Authors:
; ; ;
Publication Date:
OSTI Identifier:
4833730
Report Number(s):
US 3009062
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-62
Research Org:
Originating Research Org. not identified
Country of Publication:
United States
Language:
English
Subject:
ENGINEERING AND EQUIPMENT; ABSORPTION; AMPLIFIERS; CONTROL SYSTEMS; COUNTERS; CROSS SECTIONS; DIFFUSION; ISOTOPES; NEUTRON SOURCES; QUALITATIVE ANALYSIS; QUANTITATIVE ANALYSIS; SAMPLING; SOLVENTS; THERMAL NEUTRONS; TIMING CIRCUITS; TUBES