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Investigadores del Instituto de Física Nuclear de la Academia Polaca de Ciencias Dictarán Charlas Sobre Física Médica

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La actividad se llevará a cabo el lunes 10 de noviembre, a las 17:00 hrs en el Auditorium de la Facultad de Medicina.

El programa Magíster en Física Médica invita a la comunidad universitaria a asistir a las charlas:

"Dose measurements in Computed Tomography" a cargo de la Dra. Renata Kopec y,

"Thermoluminescence as a method for individual, environmental and clinical dosimetry" que presentará el Dr. Maciej Budzanowski.

Ambos investigadores trabajan en el Instituto de Física Nuclear de la Academia Polaca de Ciencias de Cracovia, Polonia, y se encuentran de visita en nuestra región en el marco de su participación en las Jornadas Académicas de Física Médica, Pucón-Noviembre 2014.

 

 

Resumen Charlas

Dose assesment in computed tomogaphy. Dra. Renata Kopec'.

The doses received during CT procedures can be up to 100 times higher than during conventional X-ray examination. At the same timeevery year an increasing number of CT studies are performed. Therefore it is extremely important is the appropriate choice of parametersfor a particular patient testing and monitoring of doses during the examinations. To describe the radiation dose to which the patients are exposed a few indicators are used. These include the Computed Tomography Dose Index CTDIVOL, the dose to the length of the scanned area (DLP - Dose Length Product), the absorbed dose E and increasinglyappearing SSDE size. Some indicators that estimates the risk of radiation are based on mathematical models and the standard model of an adult weighing 70 kg. Using these model doses will be underestimated for e.g. children. CTDIVOL is an index which refer to reference phantoms, depends on thelamp voltage, current, spring rate or time, but does not depend on the size of the patient. Increasingly considered SSDE size (Size-Specific Dose Estimate) is to give an estimate doses based on the actual size of the patients.

Thermoluminescence as a method for indyvidual, environmental and clinical dosimetry. Dr. Maciej Budzanowski.

The thermoluminescence method (TLD) is one of the solid state method witch could be used for dose measurements of ionising radiation. The method is based on so called TL materials usually called detectors (TLD). There are in different forms like round pellets or square chips. Detectors are readout in thermoluminescent readers manually or automatically. The first use of TLD's is dated in 50's last century when Farington Daniels applied LiF for measurements of gamma, x-rays, beta, alfa and neutron radiation. Since that time the use of method was growing and up to now this is one of the main method used in dosimetry of ionising radiation. The big advantage are dosimetric properties like the lowest limit of detection starting from 200 nGy, tissue equivalence, dose linearity up to 10 Gy, small SD% of sensitivity of TLD's in one batch, low fading and multiple reuse. In a lecture a history of thermoluminescence, main properties of detectors and the use in many fields of applications will be presented.