摘要:
A converter unit configured to convert incident photons into electrons comprises multiple blind holes forming respective ionization chambers. In additional embodiments, the converter unit is arranged in a detector, such as an X-ray detector or absolute radiation dose measurement detector, additionally comprising an electron amplification device and/or a readout device.
摘要:
A converter unit configured to convert incident photons into electrons comprises multiple blind holes forming respective ionization chambers. In additional embodiments, the converter unit is arranged in a detector, such as an X-ray detector or absolute radiation dose measurement detector, additionally comprising an electron amplification device and/or a readout device.
摘要:
A real time radiation dosimeter includes a first electrode and a second electrode, such as cathode and anode electrodes. The second electrode is based on carbon nanomaterials, such as carbon nanotubes bucky paper, carbon nanotubes forest and graphene film. The dosimeter is connected to an electrometer, able to apply a bias voltage between the electrodes and to measure the collected charge. The manufactured detectors display an excellent linear response to dose. The dosimeter with nanotubes forest is able to collect charge also to zero voltage, allowing in vivo applications. The use of nanomaterials allows a miniaturized version of dosimeters.
摘要:
A system for measuring the cumulative amount of radiation received by a person includes a radiation monitoring electret (13). This electret (13) is supported on a first conductive plate and preferably is positioned within a protective cavity such that it is not discharged by non-radiation sources. Measurement of the charge decrease on the electret over time is achieved by a null method. In particular, a second plate (11) in the monitoring device is located over the electret, or the electret itself, is vibrated and an A.C. amplitude modulation detector (16) produces an output signal created by the alternating electric field due to the vibration. A D.C. voltage of opposite charge is then applied to the first conducting plate on which the electret is supported. This field is increased until it cancels the A.C. field above the electret. When this null occurs, the applied D.C. voltage is equal to the charge on the electret. Using this null technique the electret charge can be accurately measured without contacting the electret.
摘要:
The invention relates to a method for evaluating, via biodosimetry, the irradiation dose received by a person subjected to ionizing radiation. Said method comprises: a) sampling, in at least one area of the body of the person, the follicles or bulbs of head and/or body hair of the person; b) extracting proteins from cells of said sampled hair bulbs or follicles, wherein said proteins, including proteins from the ATM system, are subjected to phosphorylation and/or acetylation induced by ionizing radiation; and c) analyzing at least two types of extracted proteins and interpreting the analysis results in order to determine the irradiation dose in the or each sampling area.
摘要:
L'invention concerne un capteur d'images électrostatique. Un exemple de réalisation comporte essentiellement deux électrodes (3, 5), une couche (4) constituée de matériau photoconducteur, et une couche diélectrique (15) constituée par un électret destiné à polariser la couche (4) de photoconducteur, sans nécessiter une source de tension pendant l'enregistrement d'une image. Pendant une phase d'enregistrement, un commutateur (14) courtcircuite les électrodes (3 et 5). Des photoporteurs sont libérés par les rayons X (1) ayant traversé un objet à radiographier (2). Ils se déplacent dans le champ électrique créé par lélectret (15) et tendent à annuler le champ électrique à l'interface des deux couches (4 et 15). Pendant une phase de lecture, le commutateur (14) relie les électrodes (3 et 5) aux entrées d'un amplificateur de courant (8), pendant qu'un faisceau lumineaux (13) balaye la couche (4) de matériau photoconducteur. Les photoporteurs se déplacement et annulent complètement le champ électrique en tout point de l'interface des deux couches (4 et 15). Le courant détecté par l'amplificateur (8) permet d'afficher une image sur un tube cathodique (11). Pendant une phase d'initialisation, la couche (4) de matériau photoconducteur est ramenée à l'état neutre au moyen d'un générateur de tension continue (12) connecté aux électrodes (3 et 5) par le commutateur (14). Application aux capteurs d'images pour la radiologie.