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Location of Fissile Material : Total γ -ray count of modelled plutonium glove box via MCNPX Kelum Gamage BSc.(Eng), PhD student (2 nd year), AMIE(SL), IEEE Professor Malcolm Joyce BSc, PhD, CEng, CPhys, FInsP, FInucE 1

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2 Nuclear Decommissioning… Kelum Gamage Paper No:12

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3 Significance of the Project [1] characterisation of glove boxes, moribund plant assessment of future arising from current processes accelerate the assessment of plutonium contaminated material reducing risk and potential dose to workers enable the PCM hazards to be prioritised source of energy toxicological riskradiological hazards Kelum Gamage Paper No:12

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4 Plutonium-239 Gamma-ray Spectrum [2] Kelum Gamage Paper No:12

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5 Analytical approach for gamma-ray self-shielding effects [3] plutonium-239 (93%) & 240 (7%) 316L stainless steel (cobalt- 60) concrete (caesium-137) compared with MCNPX simulations Gamma-ray self shielding Kelum Gamage Paper No:12

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6 Gamma-ray self shielding (cont.) Kelum Gamage Paper No:12

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7 Sphere Cylinder Cube Gamma-ray self shielding (cont.) Kelum Gamage Paper No:12

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8 Modelling of glove box environment [4] MCNPX simulations Plutonium-239 (93%) & 240 (7%) Layers and lump type Enclosure types Kelum Gamage Paper No:12

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9 Modelling of glove box environment (cont.) Figure a : Spherical lump Figure b : Layered type Case 1 Kelum Gamage Paper No:12

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10 Modelling of glove box environment (cont.) Figure a : Enclosure thickness const. Figure b : Pu mass const. MCNPX results case 1 : Sphere lump Kelum Gamage Paper No:12

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11 Modelling of glove box environment (cont.) MCNPX results case 1 : Cylindrical lump Figure a : Enclosure thickness const. Figure b : Pu mass const. Kelum Gamage Paper No:12

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12 Modelling of glove box environment (cont.) MCNPX results case 1 : Cubical lump Figure a : Enclosure thickness const. Figure b : Pu mass const. Kelum Gamage Paper No:12

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13 Modelling of glove box environment (cont.) MCNPX results case 1 : Pu layer type Figure a : Enclosure thickness const. Figure b : Pu mass const. Kelum Gamage Paper No:12

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14 Modelling of glove box environment (cont.) Case 2 Kelum Gamage Paper No:12

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15 Modelling of glove box environment (cont.) MCNPX results case 2 Figure a : x=20 Figure b : x=40. Kelum Gamage Paper No:12

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16 Modelling of glove box environment (cont.) MCNPX results case 2 Figure a : x=60 Figure b : x=80. Kelum Gamage Paper No:12

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17 Conclusion Kelum Gamage Paper No:12 Spherical lump type Stainless steel & Borosilicate type Locate near front surface Peak count at the center of the plane

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18 Acknowledgement Kelum Gamage Paper No:12

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19 References 1.M. Joyce. Location of fissile material with digital fast neutron tracking. Application for NDA doctoral bursary, July ENSDF Data Base. Evaluated nuclear structure data file. [Online] Available: K. Gamage, M. Joyce. An analytical approach to γ-ray self-shielding effects for radioactive bodies encountered nuclear decommissioning scenarios. (In preparation) 4. K. Gamage, M. Joyce. Determination of 129keV γ-ray emission of modeled plutonium glove boxes using MCNPX. (In preparation) Kelum Gamage Paper No:12

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20 THANK YOU... Contact : Kelum Gamage Paper No:12

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