1 / 5

Calibration of extremity dosimeters for Tc-99m, Cs-137 and X-ray

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

shika
Download Presentation

Calibration of extremity dosimeters for Tc-99m, Cs-137 and X-ray

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  2. 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)

  3. 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: 30-120 minutes • Cs-137: 3mm paper build up • Tc-99m: solution 5ml 0.5GBq • Tc-99m: overnight • Manual timing

  4. Irradiation 80kVp ISO X-Rays • Clinical Darpac 2000 • 80kVp nominal 5mA • Extra collimation: • Extra filtration: 0.5mmCu 1mmAl • ISO 4037 Broad series • 1st HVL 0.35mmCu • 2nd HVL 0.51mmCu • Primary beam at 45 degrees • Radiographic alignment • Perspex finger rod at 1m

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

More Related