Druck-Materie 20b.qxd - JUWEL - Forschungszentrum Jülich

APPENDIX
Some useful relations and values:
1. Bound energy of radicals :
CH3+CH3 - 83 kcal/mol, 3.6 eV
H+CH3 - 101 kcal/mol, 4.38 eV
H+OH - 117.5 kcal/mol, 5.095 eV
H+H - 103.2 kcal/mol, 4.476 eV
H+OOH - 90 kcal/mol, 3.9 eV
HO+CH3 - 90 kcal/mol, 3.9 eV
OH+OH - 51 kcal/mol, 2.21 eV
2. Relations between concentration of radicals n, mol/mol/, and stored energy Q, J/g:
Q = n C⋅10 4 ;
C = 1.08 if radicals are CH3 + CH3,
C = 1.35 if radicals are H + H in methane,
C = 1.18 if radicals are CH3 + H,
C =⋅1.37 if radicals are H + OH,
C = 1.20 if radicals are H + H in water.
3. Absorbed dose rates:
CONCLUSION
in the URAM-2: methane – 0.22 W/g,
water – 0.11 W/g,
in the ESS: methane – 2 W/g.
Notwithstanding fair amount of experimental data on spontaneous burps, it is still impossible
to derive well balanced theory of this phenomenon. Discussion on the subject and analysis of
spontaneous burps possibility in ESS moderator is in the relevant presentation to this AcoM 6
Meeting.
REFERENCES
1. E. Shabalin, H. Ullmaier, G.S. Bauer et al. URAM-2: Irradiation Experiments at the
Dubna IBR-2 Reactor. Report ESS 99-92-T, July 1999.
2. «URAM-2: Irradiation facility & the project on study on radiation effects in cold moderator
materials». Poster presentation at the ESS General Meeting in Seggau, Austria,
26-29 September 2001
3. J. Carpenter. Thermally activated release of stored chemical energy in cryogenic media.
Nature, 1987, V. 330, p.358-360 (1987).
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