Absolute calibration of the National Bureau of Standards photoneutron source—III. Absorption in a heavy water solution of manganous sulphate

Noyce, Ralph H.; Mosburg, Earl R.; Garfinkel, Simson L.; Caswell, Randall S.

doi:10.1016/0368-3230(63)90080-6

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…8, CMAIN( 100) .CREMOTdOO) ,NB , DTIME( 1 00 ) ,SECOND 100REAL X(IOO) .LAMBDA, SW( 100) ,TX( 100) ,C0UT 2,NBS1 ,RNBS 2INTEGER DAY, YEAR, PASS WRITE (5,*) 'What is the name of the input file?' READ (6,'(A) FORMAT WRITE (4,1002) FORMAT (17X, 'THE RAW COUNTING DATA WERE (time is in seconds):') WRITE(4,*) WRITE(4,*) N0=0 READ (3,*) READ (3,1003) F0RMAT(18X) 10 READ (3,100i|,END=20)…”

Section: Calibrationmentioning

confidence: 99%

Neutron source strength calibrations

McGarry¹,

Boswell²

1988

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The manganese sulfate (MnSO^) bath method of neutron source strength calibration at NBS is described and compared briefly with other MnSOb ath techniques used internationally. The accuracy of source calibration is discussed from the viewpoints of international intercomparisons and practical limitations of the NBS system. In particular, there is discussion of uncertainties associated with system limitations and with corrections necessary for neutron capture in the source, capture of fast and thermal neutrons by competing reactions in the MnSO^, capture of neutrons in the source container, and the correction for leakage of neutrons from the bath, which is 1.27 meters in diameter.

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Section: Calibrationmentioning

confidence: 99%

Neutron source strength calibrations

McGarry¹,

Boswell²

1988

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“…The radium is enclosed in platinumiridium capsules of 0.2 mm wall thickness. This source has been calibrated by several independent methods [11][12][13] and the source strength (n/s into 4ir steradians) is now established as 1.243 x 10^± 0.85% (la). The NBS 252cf spontaneous fission neutron source strengths are obtained by measuring their ratio to NBS-I in a manganese sulfate bath [14], The uncertainty of the source strength obtained in this fashion is ± 1.1% (la).…”

Section: 1mentioning

confidence: 99%

“…Typical maximum fluences are of the order of 3 x 10^^n eutrons/cm^, with combined (la) uncertainties of ± 2%. 12. KEY WORDS (Six to twelve entries; alphabetical order; capitalize only proper names; and separate key words by semicolon s) activation; dosimetry; fast neutrons; fission spectrum; neutron fluence 1 13.…”

Section: S+kmentioning

confidence: 99%

Activation foil irradiation by reactor cavity fission sources

Lamaze¹,

Grundl²

1988

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The calibration and related measurement services of the National Bureau of Standards are intended to assist the makers and users of precision measuring instruments in achieving the highest possible levels of accuracy, quality, and productivity. NBS offers over 300 different calibration, special test, and measurement assurance services. These services allow customers to directly link their measurement systems to measurement systems and standards maintained by NBS. These services are offered to the public and private organizations alike. They are described in NBS Special Publication (SP) 250, NBS Calibration Services Users Guide. The Users Guide is being supplemented by a number of special publications (designated as the "SP 250 Series") that provide a detailed description of the important features of specific NBS calibration services. These documents provide a description of the: (1) specifications for the service; (2) design philosophy and theory; (3) NBS measurement system; (4) NBS operational procedures; (5) assessment of measurement uncertainty including random and systematic errors and an error budget; and (6) internal quality control procedures used by NBS. These documents will present more detail than can be given in an NBS calibration report, or than is generally allowed in articles in scientific journals. In the past NBS has published such information in a variety of ways. This series will help make this type of information more readily available to the user. This document (SP 250-14), NBS Measurements Services: Activation Foil Irradiation by Reactor Cavity Fission Sources, by G. P. Lamaze and J. A. Grundl, is the fourteenth to be published in this new series of special publications. The scope of the service, the neutron field characteristics, the irradiation procedures, and the uncertainties in the reported neutron fluences or fluence rates are described (see test number 44090C in the SP 250 Users Guide). Inquiries concerning the technical content of this document or the specifications for these services should be directed to the authors or one of the technical contacts cited in SP 250. The Center for Radiation Research (CRR) is in the process of publishing 21 documents in this SP 250 series, covering all of the calibration services offered by CRR. A complete listing of these documents can be found inside the back cover. NBS would welcome suggestions on how publications such as these might be made more useful. Suggestions are also welcome concerning the need for new calibration services, special tests, and measurement assurance programs.

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“…After the laboratory shift, a new calibration was carried out (1961) using an 121+ Sb-Be photoneutron source in heavy water (Ref. 595). This method eliminated uncertainties due to the ratio of the manganese activation cross section and the hydrogen thermal neutron disappearance cross section, essentially by eliminating most of the hydrogen.…”

Section: )mentioning

confidence: 99%