KEK Graphite-Pile

Last update [5.Oct.2000]



 
 
 

Contents

Key words

Dimensions

Neutron source

Experimental results

More information about this pile
 



Key words
graphite pile, thermal neutron, activation, calibration

Dimensions



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.

Detail figure of foil slots

Foil Slot (picture)
Foil Slot position (picture)

Sample preparation in foil slot (picture)

Ge detector (picture)

Eff. curve of the Ge detector (figure)

Sample style for the Ge detector (figure)

Side detector hole (picture)

Side foil slot (picture)

PHA system (picture)

He-3 detector (picture)

Radiation monitor (picture)

LAN (picture)


Neutron Sources

241Am-Be 37GBq(1Ci) x2


Experimental results

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.