BEBIG CGD 282 Measurements

All of the required measurements are provided in the data sheets that come with your plaque. You will need to find these three documents that came with your plaque:

  1. Certificate for sealed radioactive sources
  2. Protocol of measurements page 1
  3. Protocol of measurements page 2

On the certificate for sealed radioactive sources you will find the total apparent activity in the plaque and its calibration date. In the example below for plaque CGD 282 the measured activity was 27.2 MBq on September 19, 2011.

CGD282CertificateTestReport

On page 1 of the protocol of measurements (appendix to the certificate) you will find a central axis calibration graph and a table. In the example below for plaque CGD 282 the measured dose rate is 123 mGy/min at 0.6 mm, 114 mGy/min at 1.0 mm, and so on. The measurements hilighted in yellow are the ones that are used by PS. You will need all the measurements from the upper table (0.6 to 10.0 mm) and the extrapolated dose rate at 0.0 mm from the lower table (143 mGy/min in this example).

CGD282ProtocolCAXData

On page 2 of the protocol of measurements (appendix to the certificate) you will find surface homogeneity measurements. The measurements hilighted in white, yellow, pink and blue are the ones that are used by PS. The measurements hilighted in purple lie beyond the edge of the plaque and will not be used.

CGD282ProtocolSurfaceData

Now that you have accumulated all of the necessary measurement data you can create a model of the plaque. Click on this link to proceed to enter the measurement data.