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Feasibility Test for Production of 99 Mo via Accelerator Neutrons. A Primitive Experiment. Measurement of 99 Mo production with the high-energy neutrons generated through 65MeV p+Be reaction on nat Mo target. Be target. Stack of metal pellets. 65MeV proton. - PowerPoint PPT Presentation
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Measurement of 99Mo production with the high-energy neutronsgenerated through 65MeV p+Be reaction on natMo target
Be target
65MeV protonStack of metal pellets
Mo Pellet10mmφ x 2mm1.6 gr
Ni Pellet10mmφ x 5mm
1 μA
Beam on : 2010.7.31, 15:00Beam off : 2010.7.31, 15:30
γ-ray counting : 2010.8.3, 18:30 〜 20:00 Counting time 300sec Detector: Ge Efficiency: 0.62% for 142-kev –γray from 99Tcm
[from a parasite experiment to the ASEAN-students program at RCNP ] by Hoang Van Khanh, M.Taniguchi, Ong Hooi Jin and K. Nakai
142-kev –ray
100cps
Feasibility Test for Production of 99Mo via Accelerator Neutrons
A Primitive Experiment
Enhancement Factors (towardsGBq)
(1)x20 bombarding time 0.5hr → 10hr
(2)X5 Mo-target 10mm thick [1 MBq ]
(3)X1000 1mA proton beam [1 GBq ]
How to get mA proton beam.
(1)30MeV 1.5mA beam exists at KUR
(2)J-PARC Injector ???
(3)New Accelerator at the cost of 6 億円 (+5 億円 for building)
⇧ ⇧ ⇧ ⇧ comparable to the cost for importing100Mo 〜 20億円 /年
Summary of the ASEAN-students experiment
Radioactivity of the first Mo pellet(1.6gr) about one half life after 30 min irradiation toneutrons 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) ☞
↓Tc--99m
Sr,Y-90
↓ ↓Nb-90
Mo-99
↓
Nb-96 ↓
↓Nb-90
↓Nb-90
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 10 20 30 40 50
mm
Log
(cou
nts
)
Tc-99m
Mo-99"
Nb-96
Zr,Y-89
Nb-90
E(É¡)keV
Tc-99m 140.5
Mo-99 181.1
Y-Sr-87 388.5
Nb-96 459.9
Y-Sr-87 484.8
Nb-90, É¿Å{ 510.9
Nb-96 569.0
Mo-99 739.5
Nb-95 765.8
Nb-96 778.2
Nb-96 810.4
Nb-96 849.8
Zr-Y-89 909.2
Nb-92 934.5
Nb-96 1091.4
Nb-90 1129.2
Nb-96 1200.6
Nb-90 2186.8
Nb-90 2319.0
Background reactions
100Mo(n, 2n)99Mo → 99mTc
Nb-90+β+
↓
92Mo(n,2p2n)89Zr →89mY
92Mo(n, p2n)90Nb
94Mo(n,2pn)93Mo(n,pn) 92Nb92Mo(n,p) }98Mo(n,2pn)97Mo(n,pn) 96Nb96Mo(n,p) }
Road MaP
Contamination