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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Effect of the nitrogen flushing on stability of the TL dosimeter for Harshaw TLD 3500
 KUBÍNOVÁ, Kateřina
It is absolutely necessary to know the achieved doses during patient irradiation for radiotherapy and doses management. Critical spots of the patient body are covered by dosimeters during whole-body irradiation via rotational technique. Thermoluminiscent detectors TLD 100 are used for in-vivo dosimetry at Nemocnice České Budějovice, a.s., (Hospital České Budějovice Ltd.). Evaluation of results is done by a Harshaw 3500 device. Nitrogen atmosphere is required by the manufacturer for evaluation of the dosimeters. The main point of this bachelor thesis is to compare the sensitivity of the dosimeter evaluation in standard and nitrogen atmosphere. The zero hypothesis was confirmed by experimental investigation and statistic evaluation. The zero hypothesis assumes that mean values of the dosimeter response sensitivity factor are the same in both cases. The found results support the assumption that there is no need to change anything on the practice at the department of oncology and that dosimeter evaluation follows the best practice. Stability of the evaluation is ensured by annealing in TLD furnace. It eliminates the influence of small impurities and grease from the patient sessions. At the same time, annealing prevents the influence of fading.
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