Essays about: "Ionization chamber"

Showing result 6 - 10 of 14 essays containing the words Ionization chamber.

  1. 6. Diode Response Correction in Large Photon Fields

    University essay from Medicinsk strålningsfysik (tills m KI)

    Author : Robert Vorbau; [2010]
    Keywords : silicon diode; energy dependence; diode response; dosimetry; relative dosimetry; dosimeter; radiotherapy; radiation detector;

    Abstract : The energy dependent response of silicon diodes in photon beams is a known problem. A new approach to solve this problem is by correcting the response, a response model was suggested by Yin et al. (2002, 2004), and later refined by Eklund and Ahnesjö (2009). READ MORE

  3. 7. Silicon Diode Dose Response Correction in Small Photon Fields

    University essay from Medicinsk strålningsfysik (tills m KI)

    Author : Artur Omar; [2010]
    Keywords : Radiotherapy; Silicon diode; Dosimetry; Dose response correction; Small field; Strålterapi; Kiseldiod; Dosimetri; Dos-respons korrektion; Små fält;

    Abstract : Silicon diodes compared to other types of dosimeters have several attractive properties, such as an excellent spatial resolution, a high sensitivity, and clinically practical to use. These properties make silicon diodes a preferred dosimeter for relative dosimetry for several types of measurements in small field dosimetry, e.g. READ MORE

  4. 8. System for dose audit for external radiation therapy based on EPR dosimetry with Lithium Formate

    University essay from Fysikum

    Author : Zelga Malke; [2010]
    Keywords : Dose; audit;

    Abstract : Radiation therapy is an important method to treat cancer with the aim to deliver as high doses as reasonably achievable to the tumor while protecting the surrounding healthy tissue and organs at risk, OARs. Therefore, it is essential to have high accuracy in the dose delivered clinically and quality assurances are required. READ MORE

  5. 9. Evaluation of the lithium formate EPR dosimetry system for dose measurements around 192Ir brachytherapy sources

    University essay from Medicinsk strålningsfysik (tills m KI)

    Author : Laura Antonovic; [2008]
    Keywords : Lithium formate; EPR; 192Ir; Dose measurements;

    Abstract : The dose distribution around brachytherapy (BT) sources is characterized by steep dose gradients and an energy spectrum varying rapidly with depth in water around the source. These two properties make experimental verification of the dose distribution difficult, and put high demands on the dosimetry system in use regarding precision, size and energy dependence. READ MORE

  6. 10. Investigation of the Frisch-grid inefficiency by means of wave-form digitization

    University essay from Örebro universitet/Institutionen för naturvetenskap

    Author : Alf Göök; [2008]
    Keywords : Nuclear Physics; Subatomic Physics; subatomär fysik;

    Abstract : Frisch grid ionization chambers are commonly used experimental tools for charged particle spectroscopy. In the ideal Frisch grid chamber the anode pulse height is independent of where inside the sensitive volume the charge has been created. This ideal cannot be realized because of imperfect shielding of the anode by the grid. READ MORE