1. Using Fluorescence X-rays for Non-invasive Biopsy
Team members: Savannah Gill
Kelvin Lin
Mike McHugh
Trey Reece
Derric Williams
Advisors: Dr. Frank Carroll
Dr. Ed Donnelly
Mr. Robert Traeger
Mr. Gary Shearer

2. Objective Monochromatic X-rays
Fire X-rays of only one energy (or wavelength)
An alternative noninvasive method for biopsy
Use fluorescent x-ray emissions from elements in tissue

3. Experiment Setup d R
Specimen
Monochromatic X-ray
Collimator

4. Preliminary Experiments
Kevex X-ray with Moly Tube
Hands-On Experience Firing X-Ray
Test for Beam Divergence
Lanthanum Intensifier Screen
Inverse Square Theorem
Approximate Aperture Spacing

6. Selecting A Material Beer-Lambert Law
Relationship between transmittance, mass attenuation coefficient, and material thickness.
@30KeV
μ (Fe) = cm2/g
μ (Al) = cm2/g
μ (Pb) = cm2/g

7. Selecting a Material Cont.
This means that using a thickness of 1cm, we could stop:
99.98% of the beam with Fe
67.64% of the beam with Al
~100% of the beam with Pb
Since leaked X-Rays making it to the detector would increase our noise and could potentially make data analysis more difficult we decided to use…

8. Collimator Design
Aluminum-Lead Sandwich Design

9. Collimator Design

10. Components Used Kevex X-Ray Lanthanum Intensifier Screen
2 Lead Sheet –
1.5 mm thick, 24X10 cm
2 Al Sheets- 25X11 cm

11. Components Used Cnt’d
Drill Press
Band Saw- 3/8 blade

12. Future Components
Pb & Al Collimator
Slimy Sally

13. Future Components
Monochromatic X-Ray
Translational Stage

14. Safety Precautions
Radiation Safety Badges
Lead Robes

15. Safety Precautions
Latex Gloves
Safety Goggles

16. Safety Precautions Handwashing Interlocking Doors Glass Wall
“Laser In Use” Signs
Scrap Bag

17. Work to Come X-Ray our collimator to evaluate hole quality
Pick metal to block collimated beam
Fire X-Ray through collimator and examine results.
Write ImageJ script to automatically determine atomic composition.

18. Questions?