Particle and Heavy Ion Transport System for Medical Linac Exercises
Explore the PHITS Multi-Purpose Particle and Heavy Ion Transport code system for hands-on exercises with a medical linac. Install X-ray components, score dose distributions, measure concrete shielding effectiveness, and more through a step-by-step guide. Discover the visualization of doses, neutron measurements, and advanced simulations in a practical learning environment.
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Presentation Transcript
PHITS Multi-Purpose Particle and Heavy Ion Transport code System Guidance for hands-on exercise Medical linac Aug. 2018 revised title 1
Step 1 Install X-ray generator made of Tungsten Install X-ray collimator made of Lead Check the geometry by T-track with axis = xz
Without (target + collimator) With (target + collimator)
Step 2 Score 2D distribution of dose Activate [T-deposit] by deleting off fill in mesh, x-type ..unit XYZ covers, target, collimator and phantom What does it look like? Think why vacuum is white i.e, why colors appear only in materials
Step 3 Change to g-show mode Change icntl = 8 See track.eps Extend the g-show range Extend 8 times Install shielding Thickness 10cm Concrete (take composition from C:\phits\data\ material.inp) Inner dimension X: -20 ~ +20, Y: -20 ~ +20, Z: -20 ~ +60
Step 4 Measure dose maxcas = 300 (save CPU time) Measure dose in the concrete shielding [T-Track] + Effective dose Define [T-track] in the backward concrete shielding Define effective dose multiplier (set multiplier ID=-202 [AP irradiation]) Hint is in C:\phits\recommendation\H10multiplier\H10multiplier.inp Dose distribution in whole geometry and depth profile
Step 5 Measure dose beyond 100 cm concrete Increase concrete thickness Be careful of outer vacuum 999 so 100.0 Introduce importance or weight-window
Step 6 Measure neutron dose Turn on photo-nuclear reaction Introduce photo-nuclear reaction bias pnimul, importance, istdev = -2 or -1
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