Nanodosimeter based on single ion detection
First Claim
1. A nanodosimeter device for detecting positive ions induced in a sensitive gas volume by a radiation field of primary particles, comprising:
- an ionization chamber filled with a low-pressure density gas including the sensitive gas volume to be irradiated by the radiation field of primary particles, the ionization chamber having an aperture opening;
an ion counter system connected to the ionization chamber for detecting the positive ions, the ion counter system having an ion counter in communication with the aperture opening;
a particle tracking system having a position-sensitive detector for detecting the primary particles passing through the sensitive gas volume; and
a data acquisition system that receives and correlates data from the ion counter system and the particle tracking system.
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Abstract
A nanodosimeter device (15) for detecting positive ions induced in a sensitive gas volume by a radiation field of primary particle, comprising an ionization chamber (10) for holding the sensitive gas volume to be irradiated by the radiation field of primary particles; an ion counter system connected to the ionization chamber (10) for detecting the positive ions which pass through the aperture opening and arrive at the ion counter (12) at an arrival time; a particle tracking system for position-sensitive detection of the primary particles passing through the sensitive gas volume; and a data acquisition system capable of coordinating the readout of all data signals and of performing data analysis correlating the arrival time of the positive ions detected by the ion counter system relative to the position sensitive data of primary particles detected by the particle tracking system. The invention further includes the use of the nanodosimeter for method of calibrating radiation exposure with damage to a nucleic acid within a sample. A volume of tissue-equivalent gas is radiated with a radiation field to induce positive ions. The resulting positive ions are measured and compared with a determination of presence or extent of damage resulting from irradiating a nucleic acid sample with an equivalent dose of radiation.
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Citations
17 Claims
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1. A nanodosimeter device for detecting positive ions induced in a sensitive gas volume by a radiation field of primary particles, comprising:
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an ionization chamber filled with a low-pressure density gas including the sensitive gas volume to be irradiated by the radiation field of primary particles, the ionization chamber having an aperture opening; an ion counter system connected to the ionization chamber for detecting the positive ions, the ion counter system having an ion counter in communication with the aperture opening; a particle tracking system having a position-sensitive detector for detecting the primary particles passing through the sensitive gas volume; and a data acquisition system that receives and correlates data from the ion counter system and the particle tracking system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for measuring positive ions induced by a radiation field of primary particles, comprising the steps of:
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providing a tissue-equivalent gas; determining a tissue-equivalent sensitive gas volume of the tissue-equivalent gas; irradiating the sensitive gas volume with the radiation field; detecting the positive ions induced by the radiation field; tracking the primary particles that pass through the sensitive gas volume; and correlating data regarding the positive ions and primary particles. - View Dependent Claims (14, 15)
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16. A method for calibrating radiation exposure from a first radiation field with the presence or extent of damage to a nucleic acid within a sample, the method comprising the steps of:
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providing a tissue-equivalent gas; determining a tissue-equivalent sensitive gas volume of the tissue-equivalent gas; irradiating the tissue-equivalent gas and the sample with the first radiation field; calculating the number of positive ions induced within the sensitive gas volume by the first radiation field; detecting the presence or extent of damage to the nucleic acid within the sample following irradiation with a second radiation field; and comparing and correlating the extent of damage to the nucleic acid within the sample with the calculated number of positive ions induced by the first radiation field. - View Dependent Claims (17)
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Specification