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Project RNG: Radiation-Based Random Number Generator

Project RNG: Radiation-Based Random Number Generator. Team Oregon Chub Colton Hamm (Team Leader) Alex Brotherston Ashley Donahoo Matt Johnson. Advisor: Dr. Hoffbeck, Dr. VanDeGrift, Dr. Osterberg Industry Representative: Mr. John Haner Bonneville Power Administration. Introduction.

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Project RNG: Radiation-Based Random Number Generator

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  1. Project RNG: Radiation-BasedRandom Number Generator • Team Oregon Chub • Colton Hamm (Team Leader) • Alex Brotherston • Ashley Donahoo • Matt Johnson • Advisor: • Dr. Hoffbeck, Dr. VanDeGrift, • Dr. Osterberg • Industry Representative: • Mr. John Haner • Bonneville Power Administration University of Portland School of Engineering

  2. Introduction • Our project generates random numbers from radioactivity • Building a radiation sensor, designing a MOSIS chip and using 7-segment displays University of Portland School of Engineering

  3. Scorecard • Completed Final Report v0.9 • Interfaced Geiger tube with CPLD University of Portland School of Engineering

  4. Additional Accomplishments • Gathered over 3700 bits of data to be analyzed for statistical tests. • Replaced function generator with batteries to power device. • 3 batteries University of Portland School of Engineering

  5. Plans • Conduct statistical tests • Complete Final Report v.95 • Complete Final Report v1.0 • Add reset and hold buttons to device • Work on Founder’s Day presentation University of Portland School of Engineering

  6. Milestones University of Portland School of Engineering

  7. Concerns/Issues • Concerns regarding battery power, especially with the large display for Founder’s Day. • Concerned about statistical tests proving that our numbers are truly random. • Concerns that case may not be done by Founder’s Day and shielding issues. University of Portland School of Engineering

  8. Conclusions • The Geiger tube, CPLD, and display have all been interfaced and are working. • Statistical tests will show if numbers are truly random. University of Portland School of Engineering

  9. Questions? University of Portland School of Engineering

  10. Secret Geiger Tube Slides • Model: Geiger Tube as a Switch • Switch=open, V=500v • Switch Closes, V= 500v*10M/(1M+10M)=455v • The capacitor blocks DC, so the signal starts at 0 volts, and falls by 45 volts when the switch closes V University of Portland School of Engineering

  11. A Geiger–Müller tube consists of a tube filled with a low-pressure inert gas, such as neon, and an organic vapor or a halogen gas. The tube contains electrodes, between which there is a potential difference of several hundred volts, but no current flowing. The walls of the tube are either entirely metal or have their inside surface coated with a conductor to form the cathode while the anode is a wire passing up the center of the tube. When ionizing radiation passes through the tube, some of the gas molecules are ionized, creating positively charged ions, and electrons. The strong electric field created by the tube's electrodes accelerates the ions towards the cathode and the electrons towards the anode. The ion pairs gain sufficient energy to ionize further gas molecules through collisions on the way, creating an avalanche of charged particles. This results in a short, intense pulse of current which passes (or cascades) from the negative electrode to the positive electrode and is measured or counted. -Wikipedia 0v -40v University of Portland School of Engineering

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