ASTM-E265 2007(Redline)

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E265-07e1 Standard Test Method for Measuring Reaction Rates and Fast-Neutron Fluences by Radioactivation of Sulfur-32 (Redline)

Published By	Publication Date	Number of Pages
ASTM	2007	7

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Categories: 27.120.30 - Fissile materials and nuclear fuel technology, ASTM

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Description

Significance and Use

Refer to Guides E 720 and E 844 for the selection, irradiation, and quality control of neutron dosimeters.

Refer to Practice E 261 for a general discussion of the determination of fast-neutron fluence and fluence rate with threshold detectors.

The activation reaction produces ³² P, which decays by the emission of a single beta particle in 100 % of the decays, and which emits no gamma rays. The half life of ³² P is 14.262 (14) days (1) and the maximum beta energy is 1710 keV (2) .

Elemental sulfur is readily available in pure form and any trace contaminants present do not produce significant amounts of radioactivity. Natural sulfur, however, is composed of ³² S (95.02 % (9)), ³⁴ S (4.21 % (8)) (1 ), and trace amounts of other sulfur isotopes. The presence of these other isotopes leads to several competing reactions that can interfere with the counting of the 1710-keV beta particle. This interference can usually be eliminated by the use of appropriate techniques, as discussed in Section 8.

1. Scope

1.1 This test method describes procedures for measuring reaction rates and fast-neutron fluences by the activation reaction ³² S(n,p) ³² P.

1.2 This activation reaction is useful for measuring neutrons with energies above approximately 3 MeV.

1.3 With suitable techniques, fission-neutron fluences from about 5 × 10 ⁸ to 10 ¹⁶ n/cm ² can be measured.

1.4 Detailed procedures for other fast-neutron detectors are described in Practice E 261.

1.5 This standard does not purport to address all of the safety problems, 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

E170 Terminology Relating to Radiation Measurements and Dosimetry E181 Test Methods for Detector Calibration and Analysis of Radionuclides E261 Practice for Determining Neutron Fluence, Fluence Rate, and Spectra by Radioactivation Techniques E720 Guide for Selection and Use of Neutron Sensors for Determining Neutron Spectra Employed in Radiation-Hardness Testing of Electronics E721 Guide for Determining Neutron Energy Spectra from Neutron Sensors for Radiation-Hardness Testing of Electronics E844 Guide for Sensor Set Design and Irradiation for Reactor Surveillance, E 706 (IIC) E944 Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance, E 706 (IIA) E1018 Guide for Application of ASTM Evaluated Cross Section Data File, Matrix E706 (IIB)

Keywords

activation analysis; beta counting; fast-neutron fluences; neutron measurement; reaction rates; sulfur; Activation reactions; Beta counting; Fast neutron flux/fluence; Neutron activation reactions; Neutron flux/fluence; Radioactivation–fast neutron flux; Reaction rates; Sulfur–nuclear materials; Threshold detectors–2 MeV;

ICS Code

ICS Number Code 17.240 (Radiation measurements); 27.120.30 (Fissile materials and nuclear fuel technology)

DOI: 10.1520/E0265-07E01 ASTM International is a member of CrossRef.

ASTM E265 (Nuclear Technology Standards)

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Additional information

Standard Title	E265-07e1 Standard Test Method for Measuring Reaction Rates and Fast-Neutron Fluences by Radioactivation of Sulfur-32 (Redline)
Published Code	ASTM
Publication Date	2007
Pages Count	7
ICS Codes	27.120.30 - Fissile materials and nuclear fuel technology

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ASTM-E265 2007(Redline)

ASTM E265 (Nuclear Technology Standards)

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