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Nguyen Thi Duyen An Institute of Nuclear for Science and Technology

A Primer Course of Experimental Particle and Nuclear Physics Advanced Technology Training Program for Radiation Measurements 6 th March 2009, Osaka University, Japan. Geiger Muller ( GM ) Counter Experiments. Nguyen Thi Duyen An Institute of Nuclear for Science and Technology. Contents.

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Nguyen Thi Duyen An Institute of Nuclear for Science and Technology

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  1. A Primer Course of Experimental Particle and Nuclear Physics Advanced Technology Training Program for Radiation Measurements 6th March 2009, Osaka University, Japan Geiger Muller ( GM ) Counter Experiments Nguyen Thi Duyen An Institute of Nuclear for Science and Technology

  2. Contents I Purpose Distance dependence of counting rate II III Determination of γ-ray absorption constants

  3. (1/) I. Purpose 1. Study of GM counter operation mechanism through measurement distance dependence of counting rate 2. Studying of γ – ray interaction with material by measuring γ- absorption constants in material

  4. (2/) II. Distance dependence of counting rates • Apparatus: Basic scale, GM counter, γ source 137Cs, lead shielding.

  5. (3/) II. Distance dependence of counting rates 2. Practice Step 1: Set up system at 1325 HV, 0.5 minute measurement time Step 2: Changing the distance between the source and GM counter (1cm/time) Step 3: Recording the count in the Basic scale

  6. (4/) II. Distance dependence of counting rates 3. Result

  7. (5/5) II. Distance dependence of counting rates Background (3 march 2009) 221counts/15minute

  8. (1/) III. Determination of γ -ray absorption constants • Apparatus: Basic scale, GM counter, γ source 137Cs, Aluminum, Iron, Lead shielding.

  9. (1/) III. Determination of γ -ray absorption constants 2. Practice Step 1: Set up system at 1325 HV, 1.5 minute measurement time Step 2: Collimating beam before striking the absorber by shielding the γ – ray source and the GM Step 2: Changing the material Step 3: Recording the count in the Basic scale

  10. (1/) III. Determination of γ -ray absorption constants 3. Result

  11. (1/) III. Determination of γ -ray absorption constants 3. Result

  12. (1/) III. Determination of γ -ray absorption constants

  13. (1/) III. Determination of γ -ray absorption constants

  14. (1/) III. Determination of γ -ray absorption constants

  15. (1/) III. Determination of γ -ray absorption constants

  16. (1/) III. Determination of γ -ray absorption constants Total cross section of absorption materials σAl = 2.44 (cm-1) σFe = 3.46 (cm-1) σPb = 18.25(cm-1) I = I0 e- μ x σ =μ / n

  17. Thank You !

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