Open Access
ND 2007
Article Number 342
Number of page(s) 3
Section Space and electronics applications
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07540

Measurement of the NIEL-scaling factor of thick target p+Be neutrons at Ep = 17.4 MeV proton energy for silicon

A. Fenyvesi1, 1, K. Makónyi1, J. Molnár1 and É.M. Zsolnay2

1  Institute of Nuclear Physics (ATOMKI), Bem tér 18/c., P.O. Box 51, 4001 Debrecen, Hungary
2  Institute of Nuclear Techniques (INT), Budapest University of Technology and Economics (BUTE), Budapest, Hungary

Published online: 21 May 2008

Radiation tolerance tests of silicon based devices are regularly done at ATOMKI with thick target p+Be neutrons at Ep = 17.4 MeV. Measurements were done to estimate their NIEL-scaling factor for silicon. The neutron spectrum was measured by the multifoil activation technique. Saturation activities of different neutron induced reactions were measured and the neutron spectrum was unfolded from them. Displacement KERMA data were taken from literature and their energy spectrum averaged value was calculated. The obtained NIEL-scaling factor was = 1.1 ± 0.20. Following the ASTM E1855-05el standard, a second type of measurement was done, too. 2N2222 bipolar transistors were irradiated by p+Be neutrons and by fission neutrons. The emitter current gain of the transistors was measured before and after the irradiation. The NIEL-scaling factor could be determined from the differences of the gains using the Messenger-Spratt equation. The obtained NIEL-scaling factor was 1.1 ± 0.23 from this measurement.

© CEA 2008