The polarity effect of compact ionization chambers used for small field dosimetry
نویسندگان
چکیده
منابع مشابه
Standard calibration of ionization chambers used in radiation therapy dosimetry and evaluation of uncertainties
Background: Absolute dosimetry of external beam radiotherapy is carried out by the use of ionization chambers. These chambers must be calibrated at a standard dosimetry laboratory before any use in clinical dosimetry. The secondary standard dosimetry laboratory of Iran (SSDL) has the duty of calibrating the ionization chambers used in radiotherapy centers in Iran. Materials and Methods...
متن کاملSU-E-T-113: Volume Effect Correction Factor KV for Small-Field Photon Dosimetry with Ionization Chambers.
PURPOSE The volume effect of ionization chambers gives rise to a spatial averaging effect that can be expressed mathematically as the convolution of the true dose profile with the detector's response function. The latter has been shown to be best described by Gaussian distribution. Based on this knowledge, the volume effect correction factor kV is derived. METHODS To derive kV, a sixth degree...
متن کاملstandard calibration of ionization chambers used in radiation therapy dosimetry and evaluation of uncertainties
background: absolute dosimetry of external beam radiotherapy is carried out by the use of ionization chambers. these chambers must be calibrated at a standard dosimetry laboratory before any use in clinical dosimetry. the secondary standard dosimetry laboratory of iran (ssdl) has the duty of calibrating the ionization chambers used in radiotherapy centers in iran. materials and methods: the pre...
متن کاملTwo New Parallel-plate Ionization Chambers for Electron Beam Dosimetry
-Two parallel-plate ionization chambers were projected, constructed and evauated for use in high energy electron beams. They were constructed using the two plastic materials recommended for clinical dosimetry protocols, i.e. acrylic and polystyrene. Both chambers have cylindrical shape with entrance windows in aluminized Mylar and they are open to the air. The acrylic chamber has a 2 mm air gap...
متن کاملStandard calibration of ionization chambers used in radiation therapy dosimetry and evaluation of uncertainties
*Corresponding author: Dr. Mostafa Ghafoori, Radiation Dosimetry and Monitoring group, Agricultural, Medical and Industrial Research School (AMIRS), Nuclear Science and Technology Research Institute (NSTRI), Atomic Energy Organization of Iran (AEOI), P.O. Box 31485-498 Karaj, Iran. Fax: +98 261 4464058 E-mail: [email protected] Background: Absolute dosimetry of external beam radiotherapy is c...
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ژورنال
عنوان ژورنال: Medical Physics
سال: 2018
ISSN: 0094-2405,2473-4209
DOI: 10.1002/mp.13227