BIO431 Lab Report 3 - Choon Liang Tan BIO431 Lab Report#3...

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Choon Liang Tan 02.04.08 BIO431 Lab Report #3 Introduction to Gamma Detectors 1. (Results shown in the three handouts of the spectra’s) 2. C + - C - = 420 – 382 = 0.0948 or 9.50% C o 401 FWHM of 9.5% is higher than the resolution that the manufacturer claims, which should’ve been between 6% and 8%. 3. Isotope: Channel #: Energy: (KeV) Cs 401 661.64 Na #1 314 511.003 Na #2 752 1274.50 Mn 500 834.827 Unknown #1 347.5 x 1 Unknown #2 632.2 x 2 The two energy values for the unknown peaks lie at those stated channel numbers, 347.5 and 632.2. In order to figure the energy values out accurately, a graph must be made between the energy (KeV) vs Channel # on y and x acid, respectively. (Graph 1.1: Correlation between Channel Number and Energy Levels of Isotopes) From the graph, the equation of the line for the trend line was: y = 1.744x – 37.105 4. To Determine the Unknown energies from the graph, one simply needs to plug in the channel numbers of the unknown sample into the equation of the linear trend line given by the graph: y = 1.744x – 37.105 A.) y = 1.744 (347.5) – 37.105 = 568.935
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B.) y = 1.744 (632.2) – 37.105 = 1065.4518 Isotope: Channel #:
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