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