In the medical applications of ionizing radiation, radiodiagnostic and radiotherapy, a relatively small error (~ 5 %) in the delivered dose may seriously harm to the patient , for this purpose thermoluminscence dosimeters(TLD-700)was use to estimate the absorbed dose from external-beam radiation therapy, and diagnostic radiology .TL dosimeters are widely used in clinical applications. TLDs measured the absorbed doses to staff and patients

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Rehab Omar El-sayed Yousef El-sayed(B. Sc. in Biophysics)(M.Sc. in Medical Physics)Medical Physicist-Clinical Oncology and Nuclear Medicine Department Mansoura University Hospitals, Egypt