{"id":24207,"date":"2024-10-17T00:07:40","date_gmt":"2024-10-17T00:07:40","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-e263-2009-2\/"},"modified":"2024-10-24T13:29:58","modified_gmt":"2024-10-24T13:29:58","slug":"astm-e263-2009-2","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-e263-2009-2\/","title":{"rendered":"ASTM-E263 2009"},"content":{"rendered":"
\n 1. Scope <\/b><\/p>\n

DESIG: E 263 09 ^TITLE: Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Iron ^SIGNUSE:<\/p>\n

Refer to Guide E 844 for guidance on the selection, irradiation, and quality control of neutron dosimeters.<\/p>\n

Refer to Practice E 261 for a general discussion of the determination of fast-neutron fluence rate with threshold detectors.<\/p>\n

Pure iron in the form of foil or wire is readily available and easily handled.<\/p>\n

Fig. 1 shows a plot of cross section as a function of neutron energy for the fast-neutron reaction 54 <\/sup> Fe(n,p) 54 <\/sup> Mn (1) <\/span> . This figure is for illustrative purposes only to indicate the range of response of the 54 <\/sup> Fe(n,p) 54 <\/sup> Mn reaction. Refer to Guide E 1018 for descriptions of recommended tabulated dosimetry cross sections.<\/p>\n

54 <\/sup> Mn has a half-life of 312.13 days (3) (2) <\/span> and emits a gamma ray with an energy of 834.845 keV (5). (2) <\/span><\/p>\n

Interfering activities generated by neutron activation arising from thermal or fast neutron interactions are 2.57878 (46)-h 56 <\/sup> Mn, 44.95-d (8) 59 <\/sup> Fe, and 5.2710-y (8) 60 <\/sup> Co (2,3) <\/span> . (Consult Ref (2) <\/span> for more precise values currently accepted for the half-lives.) Interference from 56 <\/sup> Mn can be eliminated by waiting 48 h before counting. Although chemical separation of 54 <\/sup> Mn from the irradiated iron is the most effective method for eliminating 59 <\/sup> Fe and 60 <\/sup> Co, direct counting of iron for 54 <\/sup> Mn is possible using high-resolution detector systems or unfolding or stripping techniques, especially if the dosimeter was covered with cadmium or boron during irradiation. Altering the isotopic composition of the iron dosimeter is another useful technique for eliminating interference from extraneous activities when direct sample counting is to be employed.<\/p>\n

The vapor pressures of manganese and iron are such that manganese diffusion losses from iron can become significant at temperatures above about 700 \u00b0 <\/span> C. Therefore, precautions must be taken to avoid the diffusion loss of 54 <\/sup> Mn from iron dosimeters at high temperature. Encapsulating the iron dosimeter in quartz or vanadium will contain the manganese at temperatures up to about 900 \u00b0 <\/span> C.<\/p>\n

Sections 6, 7 and 8 that follow were specifically written to describe the method of chemical separation and subsequent counting of the 54 <\/sup> Mn activity. When one elects to count the iron dosimeters directly, those portions of Sections 6, 7 and 8 that pertain to radiochemical separation should be disregarded.<\/p>\n

Note <\/span> 1\u2014The following portions of this test method apply also to direct sample-counting methods: 6.1-6.3, 7.4, 7.9, 7.10, 8.1-8.5, 8.18, 8.19, and 10-13.<\/p>\n

FIG. 1 54 <\/sup> Fe(n,p) 54 <\/sup> Mn Cross Section <\/span><\/p>\n

^SCOPE: <\/p>\n

1.1 This test method describes procedures for measuring reaction rates by the activation reaction 54 <\/sup> Fe(n,p) 54 <\/sup> Mn.<\/p>\n

1.2 This activation reaction is useful for measuring neutrons with energies above approximately 2.2 MeV and for irradiation times up to about 3 years (for longer irradiations, see Practice E 261).<\/p>\n

1.3 With suitable techniques, fission-neutron fluence rates above 10 8 <\/sup> cm \u2212 <\/span> 2 <\/sup> \u00b7 <\/span> s \u2212 <\/span> 1 <\/sup> can be determined. However, in the presence of a high thermal-neutron fluence rate (for example, >2 \u00d7 <\/span> 10 14 <\/sup> cm \u2212 <\/span> 2 <\/sup> \u00b7 <\/span> s \u2212 <\/span> 1 <\/sup> ) 54 <\/sup> Mn depletion should be investigated.<\/p>\n

1.4 Detailed procedures describing the use of other fast-neutron detectors are referenced in Practice E 261.<\/p>\n

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. <\/span> ^REFERENCE:<\/p>\n

ASTM Standards: <\/span><\/p>\n

D 1193<\/span> Specification for Reagent Water<\/p>\n

E 170<\/span> Terminology Relating to Radiation Measurements and Dosimetry<\/p>\n

E 181<\/span> Test Methods for Detector Calibration and Analysis of Radionuclides<\/p>\n

E 261<\/span> Practice for Determining Neutron Fluence, Fluence Rate, and Spectra by Radioactivation Techniques<\/p>\n

E 844<\/span> Guide for Sensor Set Design and Irradiation for Reactor Surveillance, E 706(IIC)<\/p>\n

E 944<\/span> Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance, E 706 (IIA)<\/p>\n

E 1005<\/span> Test Method for Application and Analysis of Radiometric Monitors for Reactor Vessel Surveillance, E 706(IIIA)<\/p>\n

E 1018<\/span> Guide for Application of ASTM Evaluated Cross Section Data File, Matrix E 706 (IIB)<\/p>\n

^KEYWORDS: ^STATUS: Dn Cn Sn Nn Mn ^APPROVAL: 20090601 ^PAGES: 4 ^COMMITTEE: E10 ^SUBCOMMITTEE: 0500 ^BOS: 12.02 ^ORGINFO: DOD ^ACTION: STD_REVISION ^MISCPUB: ^PDESIG: E0263 ^PYEAR: 0900 ^CLASS: Test Method <\/p>\n

2. Referenced Documents <\/b> (purchase separately) <\/i> The documents listed below are referenced within the subject standard but are not provided as part of the standard.<\/span><\/p>\n

ASTM Standards <\/b><\/p>\n

D1193<\/span> Specification for Reagent Water E170<\/span> Terminology Relating to Radiation Measurements and Dosimetry E181<\/span> Test Methods for Detector Calibration and Analysis of Radionuclides E261<\/span> Practice for Determining Neutron Fluence, Fluence Rate, and Spectra by Radioactivation Techniques E844<\/span> Guide for Sensor Set Design and Irradiation for Reactor Surveillance, E 706 (IIC) E944<\/span> Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance, E 706 (IIA) E1005<\/span> Test Method for Application and Analysis of Radiometric Monitors for Reactor Vessel Surveillance, E 706 (IIIA) E1018<\/span> Guide for Application of ASTM Evaluated Cross Section Data File, Matrix E706 (IIB) <\/p>\n

Keywords <\/b><\/p>\n

fast neutron detector; iron activation; reaction rate; 54 <\/sup> Fe(n,p); Fast neutron flux\/fluence; Iron; Neutron activation reactions; Radioactivation–fast neutron flux; Threshold detectors–2.2 MeV;<\/p>\n

ICS Code <\/b><\/p>\n

ICS Number Code 17.240 (Radiation measurements); 27.120.30 (Fissile materials and nuclear fuel technology)<\/p>\n

DOI: <\/b> 10.1520\/E0263-09 ASTM International is a member of CrossRef. <\/p>\n

\n

ASTM E263 (Nuclear Technology Standards)<\/h2>\n<\/p><\/div>\n

Citing ASTM Standards<\/span><\/p>\n

[Back to Top]<\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

E263-09 Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Iron (Redline)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n2009<\/td>\n6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":24208,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[464,2637],"product_tag":[],"class_list":{"0":"post-24207","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-27-120-30","7":"product_cat-astm","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/24207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/24208"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=24207"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=24207"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=24207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}