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| |
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| |
|
Irradiation Hole for
NAA
|
|
Three irradiation holes are situated
inside reflector for thermal and epithermal
NAA, marked by red color and named as NAA-1,
2 and 3 from the upper position in the right
figure. A irradiation hole will be additionally
installed at the low flux site. Neutron
fluxes measured using Au-wire, Cd-tube and
Ni-wire are as follows ;
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|
|
|
|
|
| Irradiation Hole |
Thermal, Φt |
Epithermal, Φe |
Fast, Φf |
Cadmium Ratio(Au) |
Remarks |
| NAA 1 |
2.95±0.03 x 1013
|
2.23±0.13 x 1010
|
4.01±0.21 x 1010
|
80 |
Operating |
| NAA2(Cd) |
5.65±0.05 x 1013 |
2.08±0.06 x 1011 |
2.53±0.06 x 1011 |
35 |
|
| NAA3 |
1.01±0.15 x 1014 |
7.74±0.19 x 1011 |
8.61±0.41 x 1013 |
13 |
|
NAA4 |
~ 1013 |
~ 1010 |
~ 1010 |
< 100 |
Planned, Developing |
|
Pneumatic Transfer System(PTS)
|
| |
PTS is a facility to irradiate Rabbit
containing sample capsules for a given time.
For the transfer, nitrogen gas is used to
reduce radioactivity level and smooth operation
is possible under the pressure of 1.2 bar.
Transfer time to insert and withdraw Rabbit
is 9 seconds and 4 seconds, respectively.
The variation of transfer time under the
normal condition is less than 5 %.
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Specification
of Irradiation Rabbit and Sample Capsule
|
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| |
|
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| Rabbit |
 |
 |
Cap
|
◎
|
◎
|
| I.D.[㎜] |
24.35 |
19.87 |
I.D.[㎜] |
24.05 |
21.12 |
| O.D[㎜] |
28.42 |
25.19 |
O.D[㎜] |
28.49 |
25.18 |
| Length[㎜] |
76.44 |
57.67 |
Height[㎜] |
10.40 |
10.75 |
| Depth[㎜] |
75.32 |
54.72 |
Weight[㎎] |
2280 |
1720 |
| Weight[㎎] |
11570 |
8060 |
|
|
|
|
|
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|
Capsule
Shape |
 |
 |
|
 |
|
◎
|
|
Type |
A |
B |
C |
D |
E |
A-E |
|
I.D.[㎜] |
6.27 |
6.17 |
6.28 |
6.24 |
6.30 |
6.37 |
|
O.D[㎜] |
7.94 |
8.17 |
7.79 |
7.99 |
8.02 |
7.62 |
|
Length[㎜] |
4.76 |
7.40 |
12.33 |
15.78 |
20.80 |
1.70 |
|
Weight[㎎] |
94.67 |
137.85 |
213.99 |
265.06 |
344.56 |
30.03 |
|
|
|
|
◎
|
| F |
G |
F-G |
| 8.13 |
8.05 |
8.45 |
| 9.80 |
9.81 |
9.62 |
19.42 |
30.46 |
2.79 |
371.23 |
567.91 |
80.95 |
|
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|
