Understanding Neutron Radiography Post Exam Reading VIII-Part 2a of 2A

Thermoluminescent Dosimetric Readout Systems
Thermoluminescent dosimetric readout systems are commonly made up of a
sample holder, heating system, photomultiplier tube (light detector), high
voltage supply, signal amplifier and a recording instrument. The
thermoluminescent dosimetric sample is heated indirectly, using electrical
resistance heat applied to a pan or planchette. The photomultiplier tube
converts the light output into an electronic pulse that is then amplified before
recording. The recording instrument may be a plotter or any other instrument
that can measure the amplified photomultiplier tube output signal. A plot of
the output signal versus time is equivalent to emitted light intensity versus
heat and results in a glow curve.
The area under the glow curve is proportional to the absorbed dose (Fig. 20).
Uses of thermoluminescent measurement of radiation include personnel
dosimetry, medical dosimetry, environmental monitoring and archeological
and geological dating.
Charlie Chong/ Fion Zhang