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Graphite-mixed CaSo4: Dy teflon TLD discs for beta dosimetry
Physics in Medicine and Biology
|September 1, 1977
Summary
Adding graphite powder to calcium sulfate: dysprosium (CaSO4:Dy) thermoluminescent dosemeters (TLDS) significantly reduces energy dependence for beta dose estimation. This enhancement also sharpens glow curves and lowers non-radiation signals for improved low-dose measurements.
Area of Science:
- Medical Physics
- Radiation Dosimetry
Background:
- Thermoluminescent dosemeters (TLDS) thickness causes energy dependence in beta dose estimation.
- This issue arises when TLD thickness is comparable to beta particle range.
Purpose of the Study:
- To investigate the effect of graphite powder additives on CaSO4:Dy Teflon TLD discs.
- To reduce energy dependence and improve beta dose estimation accuracy.
Main Methods:
- Incorporation of varying amounts of graphite powder into 0.8 mm thick CaSO4:Dy Teflon TLD discs.
- Evaluation of TLDs for beta rays with Emax values from 0.4 MeV to 2.27 MeV.
Main Results:
- Graphite incorporation considerably reduced energy dependence for beta rays.
- Addition of graphite resulted in sharper glow curves, minimizing heating time.
- Graphite reduced non-radiation-induced thermoluminescence (TL) signals, aiding low-dose measurements.
Conclusions:
- Graphite powder is an effective additive for reducing energy dependence in CaSO4:Dy TLDs for beta dosimetry.
- Graphite improves TL measurement efficiency and low-dose sensitivity.