BEBIG CIB 298 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:
- Certificate for sealed radioactive sources
- Protocol of measurements page 1
- Protocol of measurements page 2
On the certificate for sealed radioactive sources you will find the measured activity in the plaque and its calibration date. In the example below for plaque CIB 298 the measured activity was 19.9 MBq on March 2, 2004.
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 CIB 298 the measured dose rate is 105 mGy/min at 0.6 mm, 101 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 (119 mGy/min in this example).
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.
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.