6results 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.

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.

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 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.

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.