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Monday, August 3, 2020 | History

3 edition of The design of systems for the determination of plutonium by passive neutron counting. found in the catalog.

The design of systems for the determination of plutonium by passive neutron counting.

B W. Hooton

The design of systems for the determination of plutonium by passive neutron counting.

by B W. Hooton

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Published by Atomic Energy Research Establishment, Nuclear Physics Division, [distributed by H.M.S.O.] in Harwell, [London] .
Written in English


Edition Notes

SeriesAERE-R8976
ContributionsAtomic Energy Research Establishment. Nuclear Physics Division.
The Physical Object
Pagination10p., (10)p. of plates :
Number of Pages10
ID Numbers
Open LibraryOL15114429M
ISBN 100705805905
OCLC/WorldCa35337064

This test method uses passive neutron coincidence counting (4) to measure the Pu-effective mass. It has been used to assay items with total Pu contents between g and g. It has been used to assay items with total Pu contents between g and g. PLUTONIUM INVENTORY MEASUREMENT SYSTEM (PIMS) The PIMS is a distributed total neutron counting system jointly used by JNFL and the IAEA to meet a number of requirements. The sharing of such instrumentation and data reduces the costs associated with such safeguards equipment to both the operator and the safeguards authorities.

The course concerns mass determination of Pu samples using the passive neutron correlation technique (coincidence counting). The course comprises both lectures and practical sessions to give insight into the physics, neutron detectors, analysis methods, software and analysis procedures applied by the safeguards inspector in-field. Passive gamma-ray counting of the keV Pupeak in either a far-field geometry or by segmented scanning is a simpler option for materials of low density. However, most plutonium-bearing materials that are attractive for diversion are too dense for gamma-raycounting and are best measured by passive neutron counting. The technique is.

U and plutonium in the passive neutron coincidence mode. We recently have supplied the first AWCC system to the IAEA for field test and evaluation. Status of Development and Implementation Acceptable performance criteria for NDA techniques for safeguards, es- . Concept for the Pu determination The combined calorimetry, neutron coincidence counting and high-resolution gamma spectrometry measurements can directly determine a total of six quantities from a plutonium sample: the thermal power P, the amount of meffective and the plutonium isotope weight ratios m /m , m /m


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The design of systems for the determination of plutonium by passive neutron counting by B W. Hooton Download PDF EPUB FB2

@article{osti_, title = {Measurement of uranium and plutonium in solid waste by passive photon or neutron counting and isotopic neutron source interrogation}, author = {Crane, T W}, abstractNote = {A summary of the status and applicability of nondestructive assay (NDA) techniques for the measurement of uranium and plutonium in gal barrels of solid waste is reported.

C Test Method for Non-Destructive Assay of Nuclear Material in Waste by Passive and Active Neutron Counting Using a Differential Die-Away System. C Test Method for Nondestructive Assay of Plutonium by Passive Neutron Multiplicity Counting.

E Test Methods for Detector Calibration and Analysis of Radionuclides. The Monte Carlo calculations can be used to design a passive neutron and gamma multiplicity counter using the Nuclear Materials Identification System and determine the sensitivity of the NMIS. 1 - Reminder on neutron counting - Neutron sources - Interaction of neutron with matter - Neutron induced reactions - Neutron detection principles - Conversion processes - He-3 proportional counters - principle of coincidence counting - Shift register Analyser - Dead time - Comparison Passive versus Active neutron counting.

2 - Characteristics. The design of the ANTECH Model Very High Efficiency Neutron Counter (V-HENC) is a natural progression from the well-proven ANTECH Series Passive Neutron Drum Monitor used for measuring plutonium in intermediate and low level waste (LLW) litre : A.

Tolchard, M. Looman, J. Mason. Total Neutron Counting Gross neutron counting is adequate for isotopically well characterised plutonium in homogeneous and well defined chemical matrix.

For higher amounts of plutonium, multiplication effects come into play because of the fissions induced by source neutrons in fissile plutonium isotopes (,Pu).

The SF. Active and passive neutron-coincidence counting (NCC) is used routinely for nondestructive assay (NDA) of uranium and plutonium, in many forms.

Passive neutron multiplicity counting (PNMC) is used. Standard Test Method for Nondestructive Assay of Plutonium, Tritium and Am by Calorimetric Assay: ASTM C TEST METHOD FOR NONDESTRUCTIVE ASSAY OF PLUTONIUM BY PASSIVE NEUTRON MULTIPLICITY COUNTING: ASTM C GUIDE FOR PREPARATION OF WORKING REFERENCE MATERIALS FOR USE IN ANALYSIS OF NUCLEAR.

In this work, we ultimately utilize eq. (16) from relating the neutron emission rate (NE), multiplication (M), and total plutonium mass (m Pu) (3) m p u = a (C T) (M + 2 c M + c) [(M M + 2 c) N E] b (C T) with a, b, and c being instrument dependent calibration parameters, which in the case of a and b may also be functions of CT.

However, as the authors of modified the equation above to include. Passive neutron detection of fractions of a significant quantity of HEU may then become feasible with longer counting times if ship effect backgrounds can be vetoed. As discussed earlier, the neutron background varies with location, and thus some sites may have more or less background than assumed in this example, though most deployed systems.

This test method covers a system that performs nondestructive assay (NDA) of uranium or plutonium, or both, using the active, differential die-away technique (DDT), and passive neutron coincidence counting. Results from the active and passive measurements are combined to determine the total amount of fissile and spontaneously-fissioning material in drums of scrap or waste.

Need help. Chat now. Live Chat - Free Trial - Webinar - Feedback Cart (0). differential die-away and passive neutron coincidence count-ing. Examples of the apparatus, data acquisition, and calcula-tions contained in this test method are specific to the second-generation LANL passive-active neutron assay system (5) but the principle applies to other DDT systems.

Typically, the active mode is performed prior to the. Between andPlutonium Contaminated Material (PCM) was stored in the magazines at the Low Level Waste Facility at Drigg. (HRGS) and Passive Neutron Coincidence Counting (PNCC) have been installed in the new waste retrieval facilities on three of the PCM magazines.

In addition, two assay systems of a different design have also. A nondestructive method of determining the mass of large plutonium samples which is based on measuring their characteristic γ radiation is presented. The mass and the isotopic composition of the plutonium were determined according to a single measured γ spectrum in two energy ranges: the middle range, where the isotopic composition of plutonium is determined from the lines of the plutonium.

Plutonium contained in low-level waste is best char-acterized using passive-neutron assay rather than ac-tive-neutron assay systems. A high-efficiency, well-shielded, passive-neutron counter such as the JCC can give a detectability limit of mg of Pu-eff in a reasonable counting time when operated in an envi.

The design of the ANTECH Model Very High Efficiency Neutron Counter (V-HENC) is a natural progression from the well-proven ANTECH Series Passive Neutron Drum Monitor used for measuring plutonium in intermediate and low level waste (LLW) litre drums.

ANTECH has had considerable experience in the implementation of the base. neutron multiplicity measurements for determination of plutonium fissile mass. Neutron interactions will Other properties can be eliminated by careful calibration and counter design or are small or constant as described in [1].

Passive neutron multiplicity counting can separate the contributions of these three effects to the. ASTM-C - Standard Test Method for Nondestructive Assay of Plutonium in Scrap and Waste by Passive Neutron Coincidence Counting ASTM-C - Standard Guide for Establishing a Measurement System Quality Control Program for Analytical Chemistry Laboratories Within.

then describes the design and operation of TGS systems and the performance of a system to characterize “Passive Neutron Multiplicity Counting,” LA-UR, was written by Norbert Ensslin, Plutonium 4. Peak Area Determination a. Background Shape b. Interferences. Passive Neutron Counting System The IWAS is a 4π passive neutron counter using 3He proportional tubes embedded in an HDPE moderator/shield assembly.

A Canberra JSR multiplicity shift register is used for the passive neutron coincidence data acquisition. The neutron detection design and performance is very similar to that obtained 2.C Test Method for Nondestructive Assay of Plutonium, Tritium andAm by Calorimetric Assay.

C Guide for the Selection, Training and Qualification of Nondestructive Assay (NDA) Personnel. C Test Method for Non-Destructive Assay of Nuclear Material in Waste by Passive and Active Neutron Counting Using a Differential Die-Away System.The ANTECH N High Efficiency Passive Neutron Drum Monitor a high detection efficiency measurement system for the determination of plutonium mass in intermediate, transuranic or low level waste using passive neutron total coincidence or multiplicity counting, with a high detection efficiency.

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