With the purpose of reducing stray radiation dose (SRD) in out-of-field region (OFR) during radiotherapy with 6 MV intensity-modulated radiation therapy (IMRT), a body-shielding device (BSD) was prepared according to the measurements obtained in experimental testing. In experimental testing, optimal shielding conditions, such as 1 mm lead, 2 mm lead, and 1 mm lead plus 10 mm bolus, were investi...

The phosphate glass samples doped with Tb2O3 oxide (general formula: P2O5-Al2O3-Na2O-Tb2O3) were synthesized and studied for usage in high-dose radiation dosimetry (for example, high-activity nuclear waste disposals). influence of terbium concentration on thermoluminescent (TL) signals was analyzed. TL properties glasses investigated using various experimental techniques such as direct measurem...

Researchers have done many experiments to improve their dosimetry properties by adding impurities Thermoluminescent (TL) materials. Adding the TL material requires cost, time, and equipment. The purpose of this study was construct Dosimetry (TLD) chips through different thermal processes at temperatures near melting point Lithium Fluoride powder without properties, therefore additional expense ...

Dermatological and ophthalmic applicators are used in brachytherapy for the treatment of superficial lesions of skin and eyes. The calibration of these applicators should be realized periodically, according to quality control programs and international recommendations about dosimetry and calibration of brachytherapy sources. Thin thermoluminescent dosimeters of CaSO4:Dy were utilized in this wo...

PURPOSE A study of radiation dose and image quality following changes to the tube potential (kVp) in paediatric chest radiography. MATERIALS AND METHOD A total of 109 patients ranging from 1 month to 15 years were included in two phases of the study. Phase 1 investigated the range of entrance surface air kerma (ESAK) values received from patients exposed to the existing exposure factors. In t...

The aims of this study were to characterize reinforced metal-oxide-semiconductor field-effect transistor (MOSFET) dosimeters to assess the measurement uncertainty, single exposure low-dose limit with acceptable accuracy, and the number of exposures required to attain the corresponding limit of the thermoluminescent dosimeters (TLD). The second aim was to characterize MOSFET dosimeter sensitivit...

The appropriate evaluation of measured doses in mixed fi elds requires the calibration of dosimeters in relation to different types of radiation and exposure conditions in order to split the signal into individual components corresponding to the specifi c radiation and exposure conditions of the entire period and evaluate the critical level, lower limit of detection and corresponding uncertaint...

INTRODUCTION The Czech thermoluminescent dosimeters (TLD) quality assurance network was established in 1997. Its aim is to pursue a regular independent quality audit in Czech radiotherapy centres and to support state supervision. MATERIALS AND METHODS The audit is realised via mailed TL dosimetry. The TLD system consists of encapsulated LiF:Mg,Ti powder (type MT-N) read with Harshaw manual re...

We evaluated the chromosomal aberration (CA) frequencies in the peripheral blood lymphocytes of ten female patients, age average 43.7 +/- 12.9, with thyroid cancer (TC) who had been exposed to 100-200 mCi therapeutic doses of 131I. The blood samples were obtained before-treatment and at 2 and 24 h after-treatment. Radiation was measured in the samples by means of dysprosium-activated calcium su...