Gsi Helmholtzzentrum Fur Schwerionenforschung Gmbh

Gsi Helmholtzzentrum Fuer Schwerionenforschung Gmbh

Gesellschaft Fur Schwerionenforschung Mbh

Georg Fehrenbacher

Torsten Radon

Frank Gutermuth

Tobias Engert

Willi Brüchle

Georg Johannes Festag

Sebastian Grosam

Alicja Surowiec

Karsten Vogt

Johannes Georg Festag

Christian Poppe

Wolf Seufert

An area dosimeter for measuring the ambient equivalent dose of photon radiation with a diffuser, and a detector card with at least one pair of detection elements, preferably LiF-chips. A first of the two detection elements is positioned between two filters in order to spectrally filter the photon radiation. A second of the two detection elements is not positioned between such filters in order that the photon radiation arriving at the second detection element will have a different spectral distribution from the spectrally filtered photon radiation arriving at the first detection element. The two measurement values are used to obtain a weighted sum in order to achieve an optimized response characteristic.

Local dosimeter for measuring the ambient equivalent dose of photon radiation, and reading method

Irradiation device for proton and/or ion beam therapy, said device comprising a radiation source, a beam guiding device, and a therapy room comprising a treatment site and an access, wherein the therapy room is arranged in a first plane, and the treatment beam is directed into the therapy room from a second plane above or below the first plane, and oriented towards the treatment site so that the treatment beam is directed away from the access. In the therapy room, a shielding is provided, which is open towards the treatment site and associated with the entrance region of the treatment beam into the therapy room so that the access is arranged on the side of the shielding opposing the treatment site, and a labyrinth leading from the access to the treatment site is provided laterally offset to the treatment beam proceeding in the therapy room and to the shielding.

Multiplanar irradiation device with treatment beam directed opposite an access

In a shielded chamber for neutron therapy including a therapy room which has a central beam axis along which a high-energy therapy beam is introduced into the Chamber through one end wall thereof and which includes at the opposite end a labyrinth entrance with at least two shielding wall sections displaced longitudinally along the central beam axis and extending into the room from opposite side walls, the wall sections include structures for causing spallation to thereby generate from the high energy neutrons in the high energy neutron beam a plurality of low energy neutrons which are then moderated by the wall sections.

Screened chamber for ion therapy

A method of spectrometric photon dosimetry for integrally and nuclide-specifically determining a gamma dose rate for X-ray and gamma radiation. The method includes measuring a spectrum in at least one energy group or at least one interval group. The pulse height distribution is with a spectrometer and a pulse height analyzer. The number of channels of the spectrometer is such that a map of the pulse height distribution at a requisite resolution over an energy can be made. The measured pulse height distribution is converted into a photon spectrum using a deconvolution procedure that uses response functions having the same energy resolution as the pulse height distribution. The dose spectrum is calculated using dose conversion factors that are energy-dependent and related to the mean energy of a respective corresponding energy interval. The integral dose or dose rate is determined by summing the dose spectrum. The spectrometer is switched to a low-resolution mode of operation in order to ascertain an integral dose rate and switched to a high-resolution mode of operation in order to analyze radiation sources for which nuclides that cause higher dose rates are to be identified.

Method for the spectrometric photon dosimetry for X-ray and gamma radiation

Disclosed is a dosimeter () for the detection of neutron radiation within an energy range of 0.025 eV to several hundred GeV, comprising a substantially spherical base body () which is used as a moderation body and which comprises hydrogenous material, a detection element () which is arranged in the center of the base body (), and a neutron converter () surrounding the detection element (). The neutron converter () comprises metal atoms which convert the energy of the high-energy neutron radiation essentially into neutrons within a suitable energy range. The dosimeter () is characterized in that the base body () is provided with an access () through which the detection element () can be introduced into the neutron converter () and removed thereform, and in that the neutron converter () is embodied in the form of a cylinder.

Dosimeter for the detection of neutron radiation

A dosimeter for detecting high-energy neutron radiation having a neutron converter and a detection element is proposed which is characterized by the neutron converter comprising metal atoms which convert the energy of the neutrons into protons, alpha particles and other charged nuclei in a suitable energy range so that they are detectable.

Dosimeter for the detection of high-energy neutron radiation

A radiation shielding arrangement for shielding high-energy neutron radiation and gamma radiation from high-energy particle accelerators or storage rings includes a shielding element made of water-containing material, for example with chemically bound water or water of crystallization, in particular gypsum. The water component of the material preferably makes up at least 5, 10 or 20 percent by weight. The hydrogen nuclei or protons contained therein moderate neutrons in a virtually ideal manner because of the almost identical mass and the maximum pulse transformation associated with this.

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Mühital, Germany

Georg Fehrenbacher