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• Gd-LS R&D with the Russian INR/IPCE group : Gd-LS stability: good for > 6 months• Performance study of various LS recipes : : light yield : transmission & attenuation lengths• Development of purification system : Al2O3 adsorption : Vacuum distillation : Water extraction, etc• Long-term stability test• Reactivity test with acrylic • Study of Linear alkyl benzene(LAB)
Purification with Al2O3
Before
After
Purified ingredients is important!
LAB
CnH2n+1-C6H5 (n=9~14)
PC LAB
Molecular formula C9H12 CnH2n+1-C6H5
Molecular weight(g/mol)
120.19 233~237
Flash point (°C) 48 130
Density(g/ml) 0.89 0.86
Compatibility(acryllic)
Negative, need diluent
Test in progress
Cost Moderate Cheap
Fluor dissolution Very good Moderate
Domestic availability Abroad Available
etc Harmful odor Colorless & odorless
LAB
n Percent(%)
9 0.47
10 9.7
11 33.85
12 34.72
13 20.83
14 0.43
GC-MS result of LAB
Light Yield Measurement
Optimization of PPO, bis-MSB Concentration
Light Yield Measurement
LY saturated when PPO 3g/L and bis-MSB 30mg/L
Gadolonium
Gd has the highest thermal neutron capture cross-section, 49000barn.
Gd Isotop
e
Abundance(%)
Cross-section(barns)
152 0.20 735
154 2.18 85
155 14.80 60900
156 20.47 1.50
157 15.65 254000
158 24.84 2.20
160 21.86 0.77
0.1% loading is enough for RENO
Gd need to transform to Gd-CBX for loading in organic phase