Measurement of 99 Mo production with the high-energy neutrons

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 Be target Stack of metal pellets 65MeV proton [from a parasite experiment to the ASEAN-students program at RCNP ] by Hoang Van Khanh, M.Taniguchi, Ong Hooi Jin and K. Nakai Ni Pellet 10mmφ x 5mm 1 μA Mo Pellet 10mmφ x 2mm 1.6 gr 142-kev –ray Beam on : 2010.7.31, 15:00 Beam 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 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 ] • X1000 1mA 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. 5 4.5 4 3.5 Tc-99m 3 2.5 Log(counts) Mo-99" Nb-96 2 Zr,Y-89 92Mo(n,2p2n)89Zr →89mY Nb-90 92Mo(n, p2n)90Nb 1.5 94Mo(n,2pn) 93Mo(n,pn) 92Nb 92Mo(n,p) } 1 98Mo(n,2pn) 97Mo(n,pn) 96Nb 96Mo(n,p) } 0.5 0 0 10 20 30 40 50 mm ↓Tc--99m Nb-96 ↓ Mo-99 ↓ Sr,Y-90 ↓ ↓Nb-90 ↓Nb-90 ↓Nb-90 100Mo(n, 2n)99Mo → 99mTc Background reactions Nb-90+β+ ↓

5. Road MaP

6. Contamination