Instructions Record all plots and measurements in your laboratory notebook. Fully label the vertical and horizontal axes of all plots-title each axis, number the tic marks, and specify units. Report measured values with a precision of at least two significant figures. Lab partners should take turns operating the equipment. 1. Gamma Energy Calibration Place the 137Cs source on top of the HPGe detector. Accumulate the 137Cs spectrum for a time period long enough to determine the position of the photopeak (at least 120 s). Record the channel number corresponding to the center of the 137Cs photopeak. Erase the spectrum from the MCA and replace the 137Cs source with a 60Co source. Accumulate the 60Co spectrum for a period of time long enough to determine the position of the two photopeaks (at least 120 s). Record the channel number corresponding to the center of each of the two photopeaks. Erase the spectrum from the MCA and replace the 60Co source with a 109Cd source. Accumulate the 109Cd spectrum for a period of time long enough to determine the position of the photopeak (at least 120 s). Record the channel number corresponding to the center of the 109Cd peak. Erase the spectrum from the MCA and replace the 109Cd source with a 22Na source. Accumulate the 22Na spectrum for a period of time long enough to determine the position of the photopeak (at least 120 s). Record the channel number corresponding to the center of the 22Na peak. Erase the 22Na spectrum from the MCA. 2. Energy Resolution of 137Cs Place the 137Cs source on top of the HPGe detector.
Instructions Record all plots and measurements in your laboratory notebook. Fully label the vertical and horizontal axes of all plots-title each axis, number the tic marks, and specify units. Report measured values with a precision of at least two significant figures. Lab partners should take turns operating the equipment. 1. Gamma Energy Calibration Place the 137Cs source on top of the HPGe detector. Accumulate the 137Cs spectrum for a time period long enough to determine the position of the photopeak (at least 120 s). Record the channel number corresponding to the center of the 137Cs photopeak. Erase the spectrum from the MCA and replace the 137Cs source with a 60Co source. Accumulate the 60Co spectrum for a period of time long enough to determine the position of the two photopeaks (at least 120 s). Record the channel number corresponding to the center of each of the two photopeaks. Erase the spectrum from the MCA and replace the 60Co source with a 109Cd source. Accumulate the 109Cd spectrum for a period of time long enough to determine the position of the photopeak (at least 120 s). Record the channel number corresponding to the center of the 109Cd peak. Erase the spectrum from the MCA and replace the 109Cd source with a 22Na source. Accumulate the 22Na spectrum for a period of time long enough to determine the position of the photopeak (at least 120 s). Record the channel number corresponding to the center of the 22Na peak. Erase the 22Na spectrum from the MCA. 2. Energy Resolution of 137Cs Place the 137Cs source on top of the HPGe detector.
Gamma%20Spectroscopy%20Lab.docx