Helium irradiation effects in single crystals of MgAl2O4

Profile measurements of helium implanted in UO2 sintered pellets by using the 3He(d,α)1H nuclear reaction analysis technique

“…3 He ions were implanted at a target temperature of 300 K with a fluence of 10 16 3 He/cm 2 using a 10 keV 3 He þ beam. The beam was scanned to obtain homogeneous implantation and the wafer of 600 lm thickness and of 2 in.…”

“…Two sintered uranium dioxide disks (0.2 at.% 235 U) have been used to study the potentialities of the This work W. Moller [14] T. W. Bonner [17] J. L. Yarnell [16] A. P. Kluncharev [15] technique of coincidence detection of the emitted products for 3 He profiling in large depth. The mean grain size is 8 lm and the mean O/U ratio is 2.0083 ± 0.0060.…”

“…Recently, some studies have been devoted to the helium behavior in nuclear materials. Indeed, the principal source of radiation during long term storage of nuclear wastes (glasses or spent fuels) and in matrices for transmutation is a decay of actinides [1][2][3][4][5][6][7]. Amounts of helium could be large, and depending on temperature, this can change the chemical and mechanical stability of the materials.…”

“…Among the reported techniques, the 3 He(d, a) 1 H Nuclear Reaction Analysis method (NRA) has the highest depth resolution for the detection of aparticles. This technique has been successfully applied for the profiling of 3 He in near-surface layers (<0.3 lm), where the 3 He(d, a) 1 H cross-section can be considered as constant [9][10][11]. For larger depth, its sensitivity is deteriorated by the presence of large sources of background.…”

“…M€ oller [12] used an electrostatic deflector to separate emitted aparticles and backscattered 3 He incident ions, where the backscattered 3 He yield was reduced by a factor of 10 3 . This background reduction results in an enhanced sensitivity for deuterium detection.…”