Institute of Physics, FI - WP5

Experimental Data of Deep-Penetration Neutrons through a Concrete and Iron. Shield at the ISIS Spallation Neutron Source Facility using an 800-MeV Proton.
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Institute of Physics, FI • Task 5 progress report (2006.02-09) • Outlook for the next period

A. Plukis (FI), 12-13.10.2006, LMU

FI contribution in subtask A • Benchmark on photon and neutron shielding data – NEA-1552 SINBAD ACCELERATOR Shielding Benchmark Experiments (www.nea.fr/abs/html/nea-1552.html)

• Code MCNPX (mcnpx.lanl.gov/ ) – ENDF-VI and LANL nuclear data libraries used

• Results satisfactory for EURISOL shielding calculations A. Plukis (FI), 12-13.10.2006, LMU

Neutron attenuation High energy neutron (up to 800 MeV) measurements in iron shields (HIMAC) • •

Measured spectra (HIMAC) M. Sasaki et. al, Nuc. Sci. E., Vol.141, No.2, pp. 140-152, 2002 Calculated with MCNPX 2.5.0

Ratio of HE neutron flux shielding by Fe layers Ratio

20cm /0cm

40cm /20cm

60cm /40cm

Exp

0.54

0.26

0.27

MCNPX

0.21

0.23

0.27

- Good agreement for shields of different thickness. - Some discrepancy between shielded and unshielded flux (possible saturation of detector ) A. Plukis (FI), 12-13.10.2006, LMU

ISIS800 •



Experimental Data of Deep-Penetration Neutrons through a Concrete and Iron Shield at the ISIS Spallation Neutron Source Facility using an 800-MeV Proton Beam, (T.Nunoniya et al, NIM B 179 (2001) 89-102,T.Nunoniya et al, KEK Report 2001-24)  ISIS Facility, Rutherford Appleton Laboratory (RAL), United Kingdom

Shielding material

Ta

p 800MeV

A. Plukis (FI), 12-13.10.2006, LMU

12

C(n,2n) C 11

A. Plukis (FI), 12-13.10.2006, LMU

Neutron spectra 60 cm concrete

A. Plukis (FI), 12-13.10.2006, LMU

LIETDOS LIETDOS – a code created in the Institute of Physics (E.Maceika, [email protected], V.Filistovic, T.Nedveckaite): •

Modeling of the environmental contamination with 130 different radionuclides (penetrated into environment from various sources, e.g. from Ignalina NPP, radioactive waste repository, in the case of terrorist attacks and etc.);



Prediction of the main foodstuffs and drinking water radiological contamination (in the cases of the accidental and routine releases of the radionuclides into environment);



Evaluation of the exposure doses for the different age groups of the population (from external and internal exposures and using deterministic or stochastic methods). A. Plukis (FI), 12-13.10.2006, LMU

Gaussian plume model in LIETDOS_AIR for the evaluation of the radionuclide transport and dispersion in atmosphere yer a l n sio Inver

axis d u o l C

rface u s nd Grou

Reflection

Depletion, deposition

Radionuclides of different forms (gases, aerosols, organic) can be dispersed in the atmosphere and deposited on the surface A. Plukis (FI), 12-13.10.2006, LMU

Pathways of radionuclides migration in biosphere modeled in LIETDOS_BIO Radioactive release

Radioactive deposition

Inhalation Inhalation External exposure

Contamination of feedstuffs and foodstuffs Internal exposure

A. Plukis (FI), 12-13.10.2006, LMU

Scheme of the dynamic model in LIETDOS_BIO Cloud shine

Inhalation

ATMOSPHERE Inhalation of the resuspended radionuclides Counter measure Top soil

Soil

Absorption Immobile fraction

Plant

Resuspension Weathering

Transfer Mobile fraction

Translocation Inte rnal plant

Root uptake

Washout

Plant surface

Deep soil

Be rrie s Mushrooms

Fish



Leafy vegetables Root crops Grain Pasture grass

Human food ration

Cattle fe e dstuffs ration Milk

Wall shie lding Be e f Pork Exte rnal e xposure

Inte rnal e xposure Total dose

A. Plukis (FI), 12-13.10.2006, LMU

Eurisol MW target Hg inventory source term by B.Rapp Relative contribution to external exposure effective dose

25.0% 22.5%

Largest contribution

20.0% 17.5%

Hg, 91mY

199m

15.0% 12.5% 10.0% 7.5% 5.0% 2.5% Hg -1 9 Y- 9m 91 Sc m -4 Y- 8 92 Zr -8 Y- 9 90 Ir- m 18 Ir- 8 18 Au 4 -1 Ta 98 -1 O 76 s1 Ir- 85 19 Hg 2 -2 Lu 03 -1 O 70 s1 Sc 81 Au 46 -2 Mo 00 -9 3 Ir- m 18 Re 2 -1 Re 80 -1 Lu 78 -1 Hf 72 -1 7 Ta 9m -1 Au 82 -1 Pt 94 -1 Ta 86 -1 Re 72 -1 Ir- 81 18 Sc 5 -4 7

0.0%

A. Plukis (FI), 12-13.10.2006, LMU

Eurisol MW target inventory Relative contribution to internal exposure effective dose due to inhalation 30.0%

Largest contribution

27.5% 25.0% 22.5%

Y, 90Sr,

91

20.0% 17.5% 15.0% 12.5% 10.0% 7.5% 5.0% 2.5% 0.0%

91 -90 48-89 90 72 92 8m 2m 82 70-47 98 9m-46 -45 04 99 8592 88 95 89 69-48 86 73 75 93 54 Y- Sr d-1Sr Y- Hf-1 Ir-1 f-17 -19 a-1 m-1Sc u-1f-17Sc Ca Tl-2 u-1 s-1 Y- t -1 u-1 Zr- b-1Sc e-1 u-1Hf-1 Zr- u-1 P A A H A O Y R L E G H Ir T T

A. Plukis (FI), 12-13.10.2006, LMU