A Novel High Dose Rate Research Irradiator Design Analysis
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1 Engineering, Design and Manufacturing A Novel High Dose Rate Research Irradiator Design Analysis Spencer Mickum, Zach Hope, Robert Rushton, Ryan Howell Canadian Radiation Protection Association Conference June 06, 2017
2 Outline Focus Develop high-fidelity Monte Carlo simulation to characterize irradiators. Explore dose uniformity, dose rates, and overall performance of selfcontained dry storage irradiators.
3 Gammacell 220 Overview Premier stand-alone research irradiator Simple design, high dose rate, well characterized DUR Nordion business decision to discontinue in 2007 Radiation protection needs improvement 3
4 Gammacell 220 Simulation 4
5 Gammacell 220 Simulation 5
6 Gammacell 220 Simulation Dose Uniformity Ratio DDDDDD = HHHHHHHHHHHHHH DDDDDDDD iiii VVVVVVVVVVVV LLLLLLLLLLLL DDDDDDDD iiii VVVVVVVVVV DDDDDD = 1.80 Dose Uniformity Gradient DDDDDD = HH RR HH RR kk=11 jj=11 11 nn nn jj,kk 11 ii=11 (qq ii,jj,kk qq jj,kk ) DDDDDD =
7 Gammacell 220 DUG Example: R=10, H=1 DUG: 0.95 Normalized Dose Rate to Centerline Dose [a.u.] No. Radial Mesh Distances [a.u.] 7
8 Gammacell 220 DUG, Adding Rotation Example: R=10, H=1 DUG: 0.95 Adding Rotation DUG: 0.30 Difference: 70% Normalized Dose Rate to Centerline Dose [a.u.] No. Radial Mesh Distances [a.u.] 8
9 Gammacell 220 Rotation Rotation Stationary 9
10 Outline Focus Gammacell 220 GR 440 o System Concept o Simulation o Irradiation Field o Characteristics Conclusions
11 New Integrated Shielding Design Optimization from Gammacell 220 o Increase chamber size to 10 dia. X 12 tall o Maintain system weight requirements o Reduce external dose/transition dose Primary Needs o Improved flexibility for irradiation field Rotation of chamber Radial location of chamber 11
12 GR440
13 GR 440 System Concept Simulation 13
14 Outline Focus Gammacell 220 GR 440 o System Concept o Simulation o Irradiation Field o Characteristics Conclusions
15 GR440 Irradiation Field CL Dose Rate o127 Gy/min DUR o2.37 DUG o
16 GR440 Irradiation Field Irradiation Field Performance CL Dose Rate o127 Gy/min DUR o2.37 DUG o
17 GR440 Irradiation Field Irradiation Field Performance CL Dose Rate o127 Gy/min DUR o1.56 DUG o
18 GR440 Irradiation Field Irradiation Field Performance CL Dose Rate o219 Gy/min DUR o1.76 DUG o
19 Outline Focus Gammacell 220 GR 440 o System Concept o Simulation o Irradiation Field o Characteristics Conclusions
![New Integrated Shielding Design Source Configuration o Nominal Idealized Source Loading Configurations with C-198 sources LOADING #1 PENCIL POSITION NOMINAL ACTIVITY [CI] 1 1881 (7.](/docs-images/96/128500907/images/20-2.jpg "84%) 5 1924 (8.02%) 9 1924 (8.02%) 13 1881 (7.84%) 17 2078 (8.66%) 21 2078 (8.66%) 25 2088 (8.70%) 29 1881 (7.84%) 33 2054 (8.56%) 37 2131 (8.88%) 41 1912 (7.97%) 45 2155 (8.")
20 New Integrated Shielding Design Source Configuration o Nominal Idealized Source Loading Configurations with C-198 sources LOADING #1 PENCIL POSITION NOMINAL ACTIVITY [CI] (7.84%) (8.02%) (8.02%) (7.84%) (8.66%) (8.66%) (8.70%) (7.84%) (8.56%) (8.88%) (7.97%) (8.97%) TOTAL 24,000 20
21 New Integrated Shielding Design 21
22 New Integrated Shielding Design Irradiation Field Performance ocontinued uniformity after resourcing 6 sources 9 sources 12 sources 22
23 New Integrated Shielding Design Irradiation Field Performance o Transient Dose oexample: 25kGy Dose Transient Dose Ratio 0.04% Transition Dose Ratio 1.00E E E E E E E E E E Transition Position 23
24 New Integrated Shielding Design Measurement Format: Individual measurements done around top and bottom (1) and around the circumference (2)
25 New Integrated Shielding Design
26 Thank you!
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