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ASTM E526-22

Standard Test Method for Measuring Fast-Neutron Reaction Rates By Radioactivation of Titanium

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NORMA vydána dne 1.7.2022

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Informace o normě:

Označení normy: ASTM E526-22
Datum vydání normy: 1.7.2022
Kód zboží: NS-1069737
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM

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Kategorie - podobné normy:

Měření radiace
Štěpné materiály

Anotace textu normy ASTM E526-22 :

Keywords:

activation reaction, cross section, dosimetry, nuclear metrology, pressure vessel surveillance, reaction rate, titanium,, ICS Number Code 17.240 (Radiation measurements),27.120.30 (Fissile materials and nuclear fuel technology)

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Significance and Use

5.1?Refer to Guide E844 for the selection, irradiation, and quality control of neutron dosimeters.

5.2?Refer to Practice E261 for a general discussion of the determination of fast-neutron fluence rate with threshold detectors.

5.3?Titanium has good physical strength, is easily fabricated, has excellent corrosion resistance, has a melting temperature of 1668 ?C, and can be obtained with satisfactory purity.

5.4?⁴⁶Sc has a half-life of 83.787 (16)5.5?The recommended representative isotopic abundances for natural titanium 8.25 (3) % ⁴⁶Ti

7.44 (2) % ⁴⁷Ti

73.72 (2) % ⁴⁸Ti

5.41 (2) % ⁴⁹Ti

5.18 (2) % ⁵⁰Ti

5.6?The radioactive products of the neutron reactions ⁴⁷Ti(n,p)⁴⁷Sc (?_1/2 = 3.3485 (9) d) (2) and ⁴⁸Ti(n,p)⁴⁸Sc (?_1/2 = 43.67 h), (3) might interfere with the analysis of ⁴⁶Sc.

5.7?Contaminant activities (for example, ⁶⁵Zn and ¹⁸²Ta) might interfere with the analysis of ⁴⁶Sc. See 7.1.2 and 7.1.3 for more details on the ¹⁸²Ta and ⁶⁵Zn interference.

5.8?⁴⁶Ti and ⁴⁶Sc have cross sections for thermal neutrons of 0.59 ? 0.18 and 8.0 ? 1.0 barns, respectively 5.9?Fig. 1 shows a plot of the International Reactor Dosimetry and Fusion File, IRDFF-II cross section FIG. 1?SAND-II 640-Group Histogram Representation of the ^natTi(n,X)⁴⁶Sc Cross Section (Normalized per Elemental Ti Atom Using Natural Abundance Data), Represented By the Sum of the ^natTi(n,p)⁴⁶Sc, ^natTi(n,np)⁴⁶Sc, and ^natTi(n,d)⁴⁶Sc Cross Section Components

FIG. 2?⁴⁶Ti(n,p)⁴⁶Sc Cross Section (Normalized per Isotopic ⁴⁶Ti Atom), from IRDFF-II, with EXFOR Experimental Data

FIG. 3?⁴⁷Ti(n,np:d)⁴⁶Sc Cross Section (Normalized per Isotopic ⁴⁷Ti Atom), from IRDFF-II, with EXFOR Experimental Data

1.1?This test method covers procedures for measuring reaction rates by the activation reaction ^natTi(n,X)⁴⁶Sc. The X designation represents any combination of light particles associated with the production of the residual ⁴⁶Sc product. Within the applicable neutron energy range for fission reactor applications, this reaction is a properly normalized combination of three different reaction channels: ⁴⁶Ti(n,p)⁴⁶Sc; ⁴⁷Ti(n, np)⁴⁶Sc; and ⁴⁷Ti(n,d)⁴⁶Sc.

Note 1:?The ⁴⁷Ti(n,np)⁴⁶Sc reaction, ENDF-6 format file/reaction identifier MF=3, MT=28, is distinguished from the ⁴⁷Ti(n,d)⁴⁶Sc reaction, ENDF-6 format file/reaction identifier MF=3/MT=104, even though it leads to the same residual product (1).2 The combined reaction, in the IRDFF-II library, has the file/reaction identifier MF=10/MT=5.

Note 2:?The cross section for the combined ⁴⁷Ti(n,np:d) reaction is relatively small for energies less than 12 MeV and, in fission reactor spectra, the production of the residual ⁴⁶Sc is not easily distinguished from that due to the ⁴⁶Ti(n,p) reaction.

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E261-16(2021)	Standard Practice for Determining Neutron Fluence, Fluence Rate, and Spectra by Radioactivation Techniques
E170-23	Standard Terminology Relating to Radiation Measurements and Dosimetry
E181-23	Standard Guide for Detector Calibration and Analysis of Radionuclides in Radiation Metrology for Reactor Dosimetry
E262-17	Standard Test Method for Determining Thermal Neutron Reaction Rates and Thermal Neutron Fluence Rates by Radioactivation Techniques
E844-18	Standard Guide for Sensor Set Design and Irradiation for Reactor Surveillance
E1018-20e1	Standard Guide for Application of ASTM Evaluated Cross Section Data File (Includes all amendments and changes 7/2/2020).
E944-19	Standard Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance
E1005-21	Standard Test Method for Application and Analysis of Radiometric Monitors for Reactor Vessel Surveillance

ASTM E526-22

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Anotace textu normy ASTM E526-22 :

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