1. Feasibility Test for Production of 99Mo via Accelerator Neutrons
A Primitive Experiment
Measurement of 99Mo production with the high-energy neutrons
generated through 65MeV p+Be reaction on natMo target
[from a parasite experiment to the ASEAN-students program at RCNP ]
by Hoang Van Khanh, M.Taniguchi, Ong Hooi Jin and K. Nakai
Be target
65MeV proton
Stack of metal pellets
Mo Pellet
10mmφ x 2mm
1.6 gr
Ni Pellet
10mmφ x 5mm
1 μA
142-kev –ray
Beam on : , 15:00
Beam off : , 15:30
γ-ray counting : , 18:30〜20:00
Counting time 300sec
Detector: Ge
Efficiency: % for 142-kev –γray from 99Tcm
100cps

2. ⇧ ⇧ ⇧ ⇧ Summary of the ASEAN-students experiment
Radioactivity of the first Mo pellet(1.6gr) about one half life after 30 min irradiation to
neutrons generated through 65MeV 1μA Proton bombardment on the Be thick target was:
100cps/0.62% = 1.6x104 dps =16kBq ☞ 10 kBq/(gr of natural Mo metal)
Enhancement Factors (towardsGBq)
x20 bombarding time 0.5hr → 10hr
X5 Mo-target 10mm thick [1 MBq ]
X mA proton beam [1 GBq ]
How to get mA proton beam.
30MeV 1.5mA beam exists at KUR
J-PARC Injector 　？？？
New Accelerator
at the cost of 6 億円 (+5億円 for building)
⇧　⇧　⇧　⇧
　 comparable to
the cost for importing100Mo 〜 20億円/年

3. } ↓Tc--99m ↓ ↓ ↓Nb-90 100Mo(n, 2n)99Mo → 99mTc Background reactions
0.5 1
1.5 2
2.5 3
3.5 4
4.5 5 10 20 30 40 50 mm
Log(counts)
Tc-99m
Mo-99"
Nb-96
Zr,Y-89
Nb-90
100Mo(n, 2n)99Mo → 99mTc
Background reactions
92Mo(n,2p2n)89Zr →89mY
92Mo(n, p2n)90Nb
94Mo(n,2pn)
93Mo(n,pn) Nb
92Mo(n,p) }
98Mo(n,2pn)
97Mo(n,pn) Nb
96Mo(n,p)
↓Tc--99m
Sr,Y-90 ↓
↓Nb-90
Mo-99
Nb-96
Nb-90+β+ ↓

5. Road MaP

6. Contamination