Characterisation of kilo electron volt neutron fluence standard with the 45Sc(p,n)45Ti reaction at NMIJ.
We are developing a national standard of a monoenergetic kilo electron volt neutron field with the (45)Sc(p,n)(45)Ti resonance reaction. A wide resonance yields 27.4 keV neutrons at 0 degrees with respect to the proton beam. The proton energy was precisely determined in the measurement of the relative neutron yield as a function of the proton energy from the threshold energy to 2.942 MeV. Absolute measurement of the monoenergetic neutron fluence was performed using a (3)He proportional counter. Relative measurement was also carried out using a Bonner sphere calibrated at our 144 keV standard neutron field. Calibration factors were obtained between the count of a neutron monitor and the neutron fluence. A silicon-surface barrier detector with a (6)LiF foil converter was also being developed for the neutron fluence measurement. Successful results were obtained in the tests in the 144 keV standard neutron field.
Matsumoto
T
T
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan. t-matsumoto@aist.go.jp
Harano
H
H
Shimoyama
T
T
Kudo
K
K
Uritani
A
A
D007564:Japan; D009502:Neutrons; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods / Q000592:standards*; D012015:Reference Standards; D012538:Scandium / Q000737:chemistry* / Q000592:standards*; D012542:Scattering, Radiation; D014025:Titanium / Q000737:chemistry* / Q000592:standards*
D014025:Titanium; D012538:Scandium