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Contents |
KEK Graphite-Pile
Last update [5.Oct.2000]
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Contents |
graphite pile, thermal neutron, activation, calibration
1900mm(W) x 2500mm (L) x1900mm(H) carbon
Density 1.81g/cm3
Source holes (3 holes S1-3)
Central experimental hole 300mm(W) x 300mm(H) x 300mm, 500mm, 700mm(Depth)
Central foil slot (7 slots, VS1-7)
Side foil slot (8 slots, HS1-8)
Detector hole : 8 holes, 3cm diam.
Foil
Slot (picture)
Foil
Slot position (picture)
Sample preparation in foil slot (picture)
Eff. curve of the Ge detector (figure)
Sample style for the Ge detector (figure)
2000/1/26
Source : 252Cf [3.50E+05 n/s] at S1
Foil : Au (0.005cm thickness) and Cd(0.5mm)-Au
| Slot | Neutron flux [n/s/cm^2] | Normalized neutron flux[n/s/cm^2/Q] |
| VS1 | 4.78E+02 | 1.36E-03 |
| VS3 | 1.89E+02 | 5.40E-04 |
2000/3/8
Source : Am-Be [1Ci 2.3E+6 n/s] at S2
Foil : Au (0.005cm thickness) and Cd(0.5mm)-Au
| Slot | Neutron flux[n/s/cm^2] | Normalized neutron flux[n/s/cm^2/Q |
| VS1 | 1.087E+03 | 4.726E-04 |
| VS3 | 5.494E+02 | 2.389E-04 |
| VS5 | 2.621E+02 | 1.140E-04 |
| VS7 | 1.212E+02 | 5.270E-05 |
2000/6/6
Source : Two Am-Be [1Ci 2.3E+6 n/s] at S1 and
S3
Foil : Au (0.005cm thickness) and Cd(0.5mm)-Au
Neutron flux = 197 (R - Fcd Rcd)x1000 / (6.022E23 g sigma F)
R, Rcd : Au and Au with Cd; Saturated activity [Bq/mg]
Fcd : correction factor for epi-thermal neutron absorption of Cd fillter 1.04
g : non 1/v factor for the cross section 1.0053
sigma : the cross section for 2200 m/s neutron 98.5 barn
F : factor of self sheilding 0.936
| Slot | Neutron flux [n/s/cm^2] |
Normalized neutron flux [n/s/cm^2/Q] | Norm. n flux error | Cd ratio | Cd ratio error [%] |
| HS1 | 3.895E+3 | 8.471E-4 | 1.181E-5 | 6.076 | 3.249 |
| HS3 | 2.951E+3 | 6.418E-4 | 8.404E-6 | 11.09 | 3.155 |
| HS5 | 1.728E+3 | 3.759E-4 | 3.871E-6 | 27.09 | 4.652 |
| HS7 | 8.154E+2 | 1.773E-4 | 2.211E-6 | 64.48 | 5.751 |
| VS1 | 3.610E+3 | 7.851E-4 | 9.385E-06 | 6.286 | 2.790 |
| VS3 | 2.456E+3 | 5.341E-4 | 5.054E-06 | 10.02 | 3.256 |
| VS5 | 6.247E+2 | 1.359E-4 | 2.393E-06 | 9.976 | 2.886 |
| VS7 | 5.494E+2 | 1.195E-4 | 8.565E-07 | 53.79 | 5.118 |
2000/9/4
Source : Am-Be [1Ci 2.3E+6 n/s] at S2
Foil : Au (0.005cm thickness) and Cd(0.5mm)-Au
| Slot | Neutron flux [n/s/cm^2] | Normalized neutron flux [n/s/cm^2/Q] |
| VS1 | 1.076E+03 | 4.679E-04 |
| VS3 | 6.656E+02 | 2.894E-04 |
| VS5 | 2.878E+02 | 1.251E-04 |
| VS7 | 1.070E+02 | 4.651E-05 |
More information about this pile
Please contact to me; toshiya.sanami@kek.jp, if you want to use this pile for research or calibration of detectors or dosimeters.
