ASTM E526-17e1 pdf free download.Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of Titanium.
Referenced Documents
ASTM E170 Terminology Relating to Radiation Measurements and Dosimetry
ASTM E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
ASTM E181 Test Methods for Detector Calibration and Analysis of Radionuclides
The reaction is useful for measuring neutrons with energies above approximately 4.4 MeV and for irradiation times, under uniform power, up to about 250 days (for longer irradiations, or for varying power levels, see Practice E261).
Detailed procedures for other fast-neutron detectors are referenced in Practice E261.
The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
The gamma rays emitted by the radioactive decay of  46Sc are counted in accordance with Methods E181 and the reaction rate, as defined by Test Method E261, is calculated from the decay rate and the irradiation conditions.
The neutron fluence rate above about 4.4 MeV can then be calculated from the spectral-weighted neutron activation cross section as defined by Test Method E261.
Apparatus
NaI(Tl) or High Resolution Gamma-Ray Spectrometer.Because of its high resolution, the germanium detector is useful when contaminant activities are present. See Methods E181 and E1005.
Precision Balance, able to achieve the required accuracy.
Digital Computer, useful for data analysis (optional).