NKS-B GammaTest:Exercise spectra and instructions

Identification of radionuclides in sewage sludge and on a contaminated film dosimeter

The task in (a) and (b) below is to report at least all identified nuclides - perfect solution includes the identification of all significant peaks, including background peaks i.e. no background subtraction. All the relevant spectra are here: Sewage sludge and contaminated film dosimeter

a) Sewage sludge

• Peak/nuclide identification exercise spectrum file: 12711G6.chn
• Sample: sewage sludge sample in 0.5 l Marinelli beaker
• Detector: coaxial, p-type HPGe detector, relative efficiency 39%
• Energy calibration options
  1. spectrum: calibG6.chn, certificate of calibration source: certif.txt (files attached)
  2. energy calibration equation: E = 0.3337 * ch – 0.183 (E= energy in keV, ch = channel)
  3. channel-energy –pairs:
     • 140.2 – 46.54 keV
     • 1531.4 – 511.0
     • 4378.6 – 1460.8
     • 7835.4 – 2614.5

b) Contaminated film dosimeter

• Peak/nuclide identification exercise; spectrum file: 11100B1.chn
• sample: contaminated film dosimeter
• detector: Canberra BEGe detector BE5030, relative efficiency 50%, thin entrance window,thin Ge dead layer
• energy calibration options
  1. energy calibration equation: E = 0.3305 * ch + 0.7301 (E= energy in keV, ch = channel)
  2. channel – energy -pairs:
     • 67.7 – 23.1 keV
     • 516.3 – 171.3
     • 740.2 – 245.4
     • 1258.3 – 416.6

Sample of water from the primary circuit of a research reactor

Distance from end-cap to sample container is appr. 2 mm, including 1 mm teflon. The sample container is centered on top of the end-cap. Additional information is included in the attached zip-file: Water from research reactor

• DetectorData.jpg - Relevant info about the detector
• VialData.jpg - Relevant info about the geometry (vial)
• CalibCertificate.txt - Calibration Certificate Table
• calA50006.Chn - Calibration spectrum
• bkgA50173.Chn - Background spectrum
• sampA50715.Chn - Sample spectrum (primary water from research reactor)