Calibration of extremity dosimeters for Tc-99m, Cs-137 and X-ray David Rawlings Regional Medical Physics Department Newcastle-upon-Tyne.

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Presentation transcript:

Calibration of extremity dosimeters for Tc-99m, Cs-137 and X-ray David Rawlings Regional Medical Physics Department Newcastle-upon-Tyne

Introduction Extremity TLD Finger dose H’(0.07) in mSv Calibration on phantom as per ISO (1) Perspex rod 300 mm, 19mm diameter Air Kerma rate determined Published conversion to H’(0.7) (2) Basis for a UK inter-comparison 1 Bohm et al, Rad Prot Dosim (1999) 2 Grosswendt B, Rad Prot Dosim (1995)

Irradiation Cs-137 and Tc-99m Circular jig 6 Perspex finger rods at 30cm Low scatter source support Cs-137: sealed source 3.7GBq Cs-137: minutes Cs-137: 3mm paper build up Tc-99m: solution 5ml 0.5GBq Tc-99m: overnight Manual timing

Irradiation 80kVp ISO X-Rays Clinical Darpac kVp nominal 5mA Extra collimation: Extra filtration: 0.5mmCu 1mmAl ISO 4037 Broad series 1 st HVL 0.35mmCu 2 nd HVL 0.51mmCu Primary beam at 45 degrees Radiographic alignment Perspex finger rod at 1m

In conclusion… Has been used for most common types of extremity TLD Follows recommended calibration on finger dosimeters