Analytical sensitivities and energies of thermal-neutron-capture gamma rays

Database of prompt gamma rays from slow neutron capture forelemental analysis

“…Gamma-ray sources of 24 Na, 54 Mn, 57 Co, 60 Co, 65 Zn, 88 Y, 137 Cs, 152 Eu and 241 Am were used for the absolute efficiency calibration from 100 to 2754 keV (calibrant emission probabilities from all of these sources have been recommended in IAEA-TECDOC 619 [3.9]). Prompt gamma rays from the 14 N(n, γ), Cl(n, γ) and Ti(n, γ) reactions cover a wide energy span from 0.5 to 10.829 MeV, and are sufficiently well-spaced to cover the efficiency curve from the low-to high-energy region; their intensity values (I γ ) are accurately defined in Proc.…”

“…The resulting evaluated thermal neutron capture cross sections for elements Z=1-92 are summarized in column 3 of 14 N, 24 Mg, 25 Mg, 28 Si, 29 Si, 30 Si, 32 S, 33 S, 36 S, 47 Ti, 49 Ti, 51 V, 55 Mn, 58 Fe, 66 Zn, 71 Ga, 73 Ge, 74 Ge, 75 As, 79 Br, 81 Br, 82 Kr, 83 Kr, 105 Pd, 108 Cd, 117 Sn, 128 Xe, 136 Ba, 137 Ba, 146 Nd, 148 Nd, 150 Nd, 144 Sm, 156 Gd, 174 …”

Neutron-capture gamma-ray analysis of coal for sulfur, iron, silicon and moisture. [Ph. D. thesis; 111 references]

“…group of terms, crI/A, is known as the "relative sensitivity index" and was first introduced by El-Kady (8) and Duffey and coworkers (9). The list of relative sensitivity indexes compiled (8~9,lO) can be used as a guide in predioting the l.evel of success when captura gamma-ray analysis is applied to a particular matrix.…”

“…gamma-ray energies. can be found in Orphan ( 11), or Duffey · et al (9) and Senftle· ·et· ·ai. ( This equation is a simple rearrangement of the equation used to describe the exponential growth of activity within a sample as it is i.rradiated, and where no decay has occurred.…”

Thermal-neutron-capture prompt-gamma emission spectra of representative coals. [1. 5 to 11 MeV]

“…2), ·a line from nitrogen., whi~h is well separated from the rest of the spectrum, can be seen at 10.828 Mev.19 This is the highest energy major gamma ray line present in the (n;y) spectra and is also an easily recognizable feature of experimental spectra.5,8 Below it is a well-separated line of iron at 9.298 Mev.5,8,19 A much stronger doublet· from iron occurs at 7. 632 and 7.646 Mev.5,8,19 Lines from sulfur, silicon, titanium, and even sodium and potassium are reasonably distinctive.…”