15results about "Electrostatic dosimeters" patented technology

The present disclosure discloses a method for measuring and checking the irradiation of a product by a radiation source using a measuring device. After conveying the product in front of the radiation source, the radiation beam irradiates the front of the product and passes through to hit the at least two detectors, which are pointing to the same target zone of the radiation source by a collimator. Finally, the recorded signal of each detector is compared with the signals determined in the performance qualification.

The invention relates to a detector (1) for characterizing a dosimetry of a radiation. The detector includes an ionizing detector (1IC) configured for characterizing a dosimetry of a radiation beam (5) propagating along a Z-axis, the ionizing detector (1IC) comprising a matrix of ionisation chambers (ICi) distributed over a plane (X,Y) normal to the Z-axis, wherein the ionizing detector has a first spatial resolution over the plane (X, Y); an additional detector (1A) different from the ionizing detector (1IC) and having a second spatial resolution over the plane (X, Y) higher than the first spatial resolution over the plane (X, Y) of the ionizing detector and is positioned in series along the Z-axis relative to the ionizing detector (1IC); and an intelligence (10) configured to calculate a distribution of calculated doses (Dij) from the doses (DICi) measured by the ionizing detector (1IC) and the doses (DAij, DA0j) measured by the additional detector (1A).

The invention relates to a detector (1) for characterizing a dosimetry of radiation, comprising: an ionization detector (1IC) configured for characterizing a dosimetry of a radiation beam (5) propagating along a Z-axis, the ionization detector (1IC) comprising a matrix of ionization chambers (ICi) distributed over a plane (X, Y) perpendicular to the Z-axis, where the ionization detector (1IC) is located in the plane (X, Y); the ionization detector (1IC) has a first spatial resolution above the plane (X, Y), an additional detector (1A) distinct from the ionization detector (1IC) and whose second spatial resolution above the plane (X, Y) is higher than the first spatial resolution above the plane (X, Y) and is positioned in series with respect to the ionization detector (1IC) along the Z-axis, and a smart device (10), the smart device is configured to calculate a distribution of the calculated dose (Dij) from the dose (DICi) measured by the ionization detector (1IC) and the dose (DAij, DA0j) measured by the additional detector (1A).

A method of monitoring a radiation dose includes impinging an electrode with radiation and measuring a current through the electrode. Emission of secondary electrons emitted from the electrode provides a majority of the current.

The present invention discloses an online detection method for a heavy ion Bragg peak and a detection system thereof, wherein the detection system includes a treatment machine head to be detected, an acoustic detector, a heavy ion dose detection device, a thin-walled water tank, a three-dimensional moving device and a signal processing device. The detection treatment machine head is arranged on the front side of the thin-walled water tank, and water is arranged in the thin-walled water tank. By detecting the low-intensity heavy ion beam drawn out from the synchrotron accelerator of the treatment machine head, the characteristic law of the acoustic pulse signal of a specific energy beam at different positions behind the Bragg peak is found. At the same time, based on the amplitude data of the acoustic pulse signal detected at the same position, a function law is obtained. In clinical applications, the function law found by this detection method can be used to quickly locate the specific position of the Bragg peak, thereby ensuring that the Bragg peak position is consistent with the planned position.

Embodiments of the present disclosure relate to an asymmetric dual-mode ionization system and method. The asymmetric dual-mode ionization chamber measurement system may include a first high voltage plate, a second high voltage plate, and a readout plate. The first high voltage plate may be positioned a first active volume from the readout plate. The second high voltage plate may be positioned a second active volume from the readout plate. A high voltage potential may be coupled to the first high voltage plate during a first mode and to the second high voltage plate during a second mode. Ion pairs generated by radiation fluxes passing through the first active volume during the first mode and through the second active volume during the second mode may be measured at the readout plate to determine a radiation rate of the ionizing radiation. The asymmetric dual-mode ionization chamber measurement system may advantageously measure different radiation fluxes having significantly different ranges of radiation rate fluxes.

The present invention discloses a measuring device for the rotational output dose of a helical tomotherapy device, which includes a phantom and a first insertion rod. The first insertion rod slot is arranged in the axial direction of the phantom and is located at the axis of the phantom. The first insertion rod is disposed in the first insertion rod slot and fits with the first insertion rod slot. An electrometer slot is provided in the middle of the first insertion rod. Since the present invention can design the size of the electrometer slot to be the size of the ionization chamber of a conventional electrometer, the universality is increased. Secondly, when measuring the rotational output dose of the helical tomotherapy device, the electrometer is located below the axis of the phantom. After removing the first insertion rod and inserting it upside down, when the first insertion rod is inserted into the first insertion rod slot, the electrometer slot is coaxial with the phantom, which is beneficial to measuring the indexes of the linear moving treatment beam, the changes with the angular position of the device, and the changes with the rotation of the gantry.

The invention discloses a device and method for measuring the water absorbed dose of a particle source, and the device comprises a charge measurement device, and a particle source support, a shutter, a diaphragm, a first water die body, a grid assembly and a second water die body which are sequentially arranged in a first direction. The particle source support is provided with a particle source. The grid electrode assembly comprises a supporting frame, a first driving module and a grid electrode group, the grid electrode group is provided with a plurality of grid electrodes which are sequentially arranged and installed on the supporting frame in the first direction, the first driving module is used for driving the supporting frame to reciprocate in the first direction, and the charge measuring device is connected with the grid electrodes so as to measure accumulated charges under unit volume. The absolute measurement of the water absorbed dose of the particle source is realized.

An infusion system may include a strontium-rubidium radioisotope generator that generates a radioactive eluate via elution, a beta detector, a gamma detector, and a controller. The beta detector and the gamma detector may be positioned to measure beta emissions and gamma emissions, respectively, emitted from the radioactive eluate. In some examples, the controller is configured to determine an activity of rubidium in the radioactive eluate based on the beta emissions measured by the beta detector and determine an activity of strontium in the radioactive eluate based on the gamma emissions measured by the gamma detector.

This invention discloses an X-ray radiation field calibration method, belonging to the field of X-ray calibration technology, including the following steps: S1. Setting up a calibration system; S2. Measuring the dose rate distribution and uniformity of the radiation field using a beam analysis system; S3. Measuring the output stability of the radiation beam using an ionization chamber dosimeter; S4. Turning off the radiation source; S5. Measuring the deviation of the radiation beam from the orbital center axis using an ionization chamber scanning method or imaging method; S6. Recording environmental parameters, measurement data, and calculation results during the calibration process; S7. Based on the measurement data and uncertainty evaluation method. This invention eliminates systematic errors introduced by environmental factors at the source by strictly controlling the temperature, humidity, vibration, and electromagnetic interference of the calibration environment. It utilizes a beam analysis system, an ionization chamber dosimeter, and a radiation protection dose equivalent rate meter working in tandem to achieve comprehensive detection of the radiation field dose rate distribution, uniformity, output stability, radiation beam deviation, and surrounding dose equivalent.

The present invention provides an X-ray detector, which includes an anode ceramic plate. A lead ring, a ceramic ring, a lead ring and a secondary ceramic plate are stacked on one side surface of the anode ceramic plate to form a secondary ionization chamber, and a lead ring, a ceramic ring, a lead ring and a main ceramic plate are stacked on the other side surface to form a main ionization chamber; gases are filled in the main ionization chamber and the secondary ionization chamber; both the main ionization chamber and the secondary ionization chamber are connected to a BNC plug connector.

The invention discloses a method for testing the single-energy electron total dose shielding rate of a packaged and reinforced integrated circuit based on electrical parameter change, belongs to the field of radiation hardening of semiconductor devices, and solves the problems of long time consumption, high cost and high reliability in direct testing of a circuit failure threshold in the prior art. The problems that systematic deviation exists in engineering conversion due to the fact that a material shielding test excessively focuses on source attributes but neglects actual space environment equivalence, deposition dose cannot be accurately obtained, and a quantitative mapping relation between material shielding and circuit function degradation is not established are solved. According to the method, the total dose radiation resistance is further obtained by obtaining the relation between the failure threshold value of the unreinforced circuit, the fitting dose and the electrical parameters and deducing the deposition dose and the shielding rate of the sensitive area of the packaging reinforced circuit, the material shielding performance evaluation precision is improved, the test time is shortened, the cost is reduced, and a reliable basis is provided for packaging reinforced design; and the reliability of the integrated circuit in a space radiation environment is enhanced.

To provide a hybrid two-dimensional detector.SOLUTION: Regarding a detector (1) characterizing measurement of the dose of radiation, the detector includes an ionization detector (1IC) that is configured so as to measure the dose of radiation beams (5) propagating along the Z axis, includes an ionization box (ICi) dispersed to an entire section of a surface (X, Y) vertical to the Z axis, and has first spatial resolution over the entire section of the surface (X, Y), includes an additional detector (1A) that differs from the ionization detector (1IC), has second spatial resolution in the entire section of a surface (X, Y) higher than the first spacial resolution in the entire section of the surface (X, Y) of the ionization detector, and is placed in series along the Z axis relative to the ionization detector (1IC), and intelligence configured so as to obtain a calculation dose distribution from a dose (DICi) measured by the ionization detector (1IC) and a dose (D) measured by the additional detector (1A).SELECTED DRAWING: Figure 6

An ionization detector provides accurate measurements of high dose rate, short duration radiation pulses required by FLASH radiation therapy procedures by employing high voltages across narrow ionization channels minimizing saturation and polarization effects. Air equivalent polymers may be used to provide the electrodes of the ionization detector for improved accuracy and to resist radiation-induced degradation.

The invention relates to a detector (1) for characterizing a dosimetry of a radiation, comprising, • an ionizing detector (1IC) configured for characterizing a dosimetry of a radiation beam (5) propagating along a Z-axis, the ionizing detector (1 IC) comprising a matrix of ionisation chambers (ICi) distributed over a plane (X,Y) normal to the Z-axis, wherein the ionizing detector has a first spatial resolution over the plane (X, Y), • an additional detector (1A) different from the ionizing detector (1IC) and having a second spatial resolution over the plane (X, Y) higher than the first spatial resolution over the plane (X, Y) of the ionizing detector and is positioned in series along the Z-axis relative to the ionizing detector (1IC), and • an intelligence (10) configured to calculate a distribution of calculated doses (Dij) from the doses (DICi) measured by the ionizing detector (1IC) and the doses (DAij, DA0j) measured by the additional detector (1A).