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Calculated behavior of a fast neutron spectrometer based on the total absorption principle

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Published by Administrator in U.S. Dept. of Commerce, Office of Technical Services

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        StatementU.S. Dept. of Commerce, Office of Technical Services
        PublishersU.S. Dept. of Commerce, Office of Technical Services
        Classifications
        LC Classifications1959
        The Physical Object
        Paginationxvi, 134 p. :
        Number of Pages67
        ID Numbers
        ISBN 10nodata
        Series
        1
        210
        3NBS technical note ;

        nodata File Size: 2MB.


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Source identification is then possible and important information is revealed regarding the surroundings of the source.t TOF values formed between uncorrelated neutrons.

Characterisation of mixed neutron

regions where it can move freely, but beyond which it cannot move. The relevant equation is 3. These simulated measurement signals build on the same absorption line data as the evaluation.

Further, these sensors could be placed behind a neutron collimator where a total instrument mass would be comparable to the targeted mass 25 kg of the LEND instrument Mitrofanov et al. This problem is further compounded if the source is shielded with borated material, significantly reducing the number of emerging neutrons.

During one RMC simulation, the atoms moved randomly within a determined time interval. Although similar in general form, the simulated spectra for the other experiments listed in table may be different in detail. The decay modes of interest for the present discussion are:• Table also includes comparative data from the indicated literature. For an easier comparison the normalized diode pulse response is shown in the same figure.

For neutron energies above 20 MeV, the capture-gating analysis predicted an effective area between 1800 cm 2 and 2500 cm 2. The installation at JET is schematically depicted in Fig.

Because EXAFS PRDFs of MGs usually have a strong peak that denotes the first-shell atomic distances whose cut-off values range from about 3. Further, the results of are not consistent with a sub-100 ppm detection sensitivity, as claimed by Chin et al. Second, the emission spectrum of the same lamp shining through the sample is measured this is called the "sample spectrum". These background components should be well understood both in order to design the diagnostic system and to interpret the data.

Neutrons from region 3 can be detected if they have sufficient energy to pass through a collimator wall and be detected by the neutron sensor. Alternatively, when full-scale plasma modeling is not available or too time consuming, more simplified models can be used where a number of distinct fuel components are used to represent the main processes in the plasma.