13 results about "Activity measurement" patented technology

The present disclosure relates to a radioactive waste barrel activity measuring device, comprising a chassis and a conveying mechanism arranged on the chassis, the bottom of the chassis is connected with walking wheels, a dose measuring mechanism and a detector assembly are arranged on one side of the conveying mechanism on the chassis, the detector assembly is movably arranged on the chassis to be able to approach or move away from the conveying mechanism, a control system is further arranged on the chassis, and the control system is electrically connected with the dose measuring mechanism and the detector assembly respectively. In this way, the device can conveniently adjust the waste barrel and the radioactive activity measuring device for radioactive measurement, and move to the required measurement site according to the requirement. Through the control system, all running actions of the whole measuring device can be controlled, and the data collected by the dose measuring mechanism and the detector assembly are collected, the efficiency of the activity measurement of the radioactive waste barrel is improved, and the measurement operation of the low-activity radioactive waste barrel is conveniently and quickly completed.

The invention relates to a method and a device for judging the measurement accuracy of reactor core power inclination. The method comprises the following steps: acquiring activity measurement data of a reactor core; constructing a reactor core power equation set based on a corresponding relation between a detector and a reactor core channel in the activity measurement data, and setting a calibration factor of a specified detector in the equation set as a preset value; constructing an error vector, converting the equation set into an error equation by using the error vector, and solving the error equation based on the activity measurement data to obtain a first calibration factor of each detector; determining a power drift factor, converting the equation set into a power drift equation by using the power drift factor, and solving the power drift equation based on the activity measurement data to obtain a second calibration factor of each detector; and according to the first calibration factor and the second calibration factor of each detector, judging the accuracy of the reactor core power inclination result measured by each detector. By adopting the method, the measurement accuracy of the quadrant power inclination of the reactor core can be judged.

The invention discloses an activity value measuring method based on closed-loop feedback and an activity meter. The method comprises the following steps: 1) selecting an activity meter with the same model as a target activity meter as a prototype and placing the prototype in a programmable precision incubator; selecting a standard reference source and placing the standard reference source at a measurement position of the prototype; 2) starting an activity meter to measure the activity value of the standard reference source; calculating a compensation factor measured value under the current combination (T, t); 3) establishing a composite mathematical model CF which takes the temperature T and the operation time point t as independent variables and takes the compensation factor CF as a dependent variable, fitting and solving the measured value of each compensation factor to obtain a specific coefficient numerical value of the model CF, and pre-storing the specific coefficient numerical value into a target activity meter; (4) reading the initial temperature by the target activity meter, and loading a pre-stored composite mathematical model, and (5) collecting the current environment temperature, reading the accumulated operation time, calculating according to the collected radiation signal to obtain an original activity measurement value when the target activity meter is used for radioactive activity measurement, and then obtaining a corrected activity value according to the model.

The invention discloses an activity measurement method based on an adaptive coincidence window and dead time correction. The method comprises the following steps: (1) arranging three photomultipliers around a sample to be detected, monitoring three paths of signals generated by the three photomultipliers, and when any path of signal has a rising edge, triggering a self-adaptive coincidence window of which the width is determined by a counting rate R; when R < =, = to ensure that a real coincidence event is captured; at gt; rgt; when R is greater than R, decreasing gradually along with the increase of R so as to reduce accidental coincidence counts; when R > =, = to maximize coincidence efficiency; 2) performing coincidence event judgment in the adaptive coincidence window; the width of the dead time window is adaptively adjusted according to the counting rate R, when R is larger than or equal to R, the width of the dead time window is shorter, and when R is smaller than or equal to R, the width of the dead time window is longer, (4) after the dead time window is finished, normal monitoring is recovered, and (5) when measurement is terminated, the activity of the sample to be measured is reversely deduced through coincidence counting.

According to one aspect, a method for determining an augmented vital sign, such as heart rate or heart rate variability, includes obtaining a signal from a patient when the patient is in both active and inactive situations. An activity signal is generated from a first signal and a physiological signal is generated from a second signal. An activity weight factor is calculated from the activity signal and a vital sign signal is calculated from the physiological signal. A mapping from the activity signal to the vital sign helps determine the vital sign over an entire period of motion. The augmented vital sign is a result of a combination of a first value and a second value, the combination including a product of the activity weight factor and an activity-derived vital sign and a product of the vital sign signal and the activity weight factor less than one.

The utility model discloses a device for measuring the activity of a cobalt-60 industrial source. The device comprises a radioactive source bracket and an activity measuring assembly, wherein the activity measuring assembly and the radioactive source bracket are arranged at an interval. A shielding assembly is arranged on the side, away from the radioactive source support, of the activity measuring assembly and used for absorbing rays penetrating through the detection end of the activity measuring assembly. The activity measurement assembly comprises a detection probe, a ray collimation assembly and an installation sleeve shell arranged on the ray collimation assembly in a sleeving mode. The ray collimation assembly is provided with a ray collimation channel. And the detection probe is arranged at the tail end of the ray collimation channel. The ray collimation assembly comprises a plurality of diaphragms which are arranged at intervals, and the diaphragms made of metal tungsten are adopted, so that rays in other directions can be blocked by the diaphragms made of the metal tungsten when being reflected after being in contact with the inner wall, the rays in other directions are effectively prevented from being received by a detection probe, and the detection accuracy is improved. Therefore, the detection result is prevented from being influenced.

The invention discloses a TDCR circular shift wave coupling measurement method under low luminous efficiency, and the method comprises the steps: carrying out the counting measurement of a background solution and a series of quenching sources through a TDCR circular shift wave coupling module, drawing a shift wave quenching correction curve, and further calculating the transition of a sample. The invention also discloses a TDCR circular wave-shifting coupling measurement device under low luminous efficiency, the device comprises a sample bottle and three PMTs which are placed at an included angle of 120 degrees by taking the sample bottle as a center, and the outer wall of the sample bottle is surrounded by an optical coupling silicone oil ring layer and an outer wave-shifting agent layer from inside to outside in sequence. According to the invention, the circular wave shifting module design is adopted, the TDCR technology is combined, so that the Cerenkov measurement efficiency is higher, the device is suitable for activity measurement when the Cerenkov luminous efficiency of nuclides is lower, such as Sr-90 and F-18, the device is matched with multiple bottles of quenching sources to carry out quenching correction, the activity measurement precision is higher, and the stability is better.

The invention provides a nuclide activity measurement method based on a neural network, and relates to the technical field of nuclide activity measurement, and the method comprises the steps: constructing a coincidence measurement system, obtaining a plurality of groups of counting parameters of nuclides under different beta detection efficiencies through the system, and carrying out the correction processing of the counting parameters, and inputting the corrected counting parameter into a one-dimensional convolutional neural network model, and obtaining the nuclide real activity based on a condition that model output extrapolation is performed until beta detection efficiency is 100%. According to the method, the neural network is adopted to replace a traditional extrapolation fitting method, the nonlinear relation between the nuclide counting rate and the activity is automatically learned, the accuracy and robustness of activity measurement are remarkably improved, the method does not depend on an explicit function form, abnormal data can be effectively handled, the accuracy of beta, gamma and coincidence counting rates is ensured, and the method is suitable for popularization and application. The interference of environmental background and cosmic rays is effectively inhibited, the signal-to-noise ratio is increased, the measurement efficiency is improved, the operation is simpler and more convenient, and the method is suitable for various nuclear technology application scenes.

The present invention relates to a radiopharmaceutical dose calculation method and apparatus for pre-injection analysis for imaging. The calculation method comprises: acquiring the current radioactivity of a radiopharmaceutical and a weight and a height of the currently medicated patient; generating a first standard curve on the basis of data in a data lookup table; generating a second standard curve on the basis of a total activity dose formula; and plotting the first standard curve and the second standard curve into a same coordinate system to form two standard curves whose envelopes define a safe medication range and which do not completely overlap, and determining, on the basis of the standard curves, a desired volume of the radiopharmaceutical to be withdrawn for the current injection for the patient. The calculation apparatus can execute the calculation method. The present invention not only improves accuracy of radiopharmaceutical dose calculation, but also significantly improves system operating efficiency and user experience. By means of accurate activity measurement and accurate patient information entry, the system can quickly generate a personalized dose scheme, thereby reducing errors caused by manual operation and improving use safety and effectiveness.

The application belongs to the technical field of lunar soil measurement, and particularly relates to an analysis method for non-destructive measurement of stable metal isotope ratio in lunar soil, which comprises the following steps: step S1, placing a sample (2) to be measured into a reactor (1) to perform irradiation operation, wherein the sample (2) comprises a lunar soil sample and an earth sample, and the earth sample comprises standard substance and neutron fluence rate parameter monitoring material; step S2, after the irradiation operation is completed, cooling is performed, and then a HPGe detector (4) is combined with a digital multi-channel spectrometer (7) to perform radioisotope activity measurement on the activated lunar soil sample; step S3, after the radioisotope activity measurement is completed, the ratio of stable isotope A and stable isotope B in the lunar soil sample is calculated; and step S4, the difference between the isotope ratio of the lunar soil sample and the isotope ratio of the earth sample is calculated. The non-destructive isotope ratio measurement method provided by the application is complementary to the mass spectrometry method such as ICPMS, and more nuclear technology scientific data is provided for non-destructive analysis of lunar soil.

The invention relates to a single-nuclide gamma radioactive sample activity measuring system and method, and the system comprises a shielding box body which is located outside a measuring cavity; the measuring cavity comprises a cube detection area formed by six flat-plate-shaped detectors; the height-adjustable bracket is arranged on the flat-plate-shaped detector at the bottom during use and is used for placing a sample to be detected; and the weight sensor is arranged in the shielding box body and is supported at the bottom of the measuring cavity. The measurement method comprises the following steps: calculating the relative deviation of the detection efficiency of each point location and a central point location in a detection area by adopting a Monte Carlo simulation method, and finding a sensitive area; simulating and calculating self-absorption correction factors of different characteristic samples in the sensitive area, and constructing a database; and experimental measurement: placing a sample to be measured in the sensitive area for measurement, automatically weighing, calling the database through sample parameters, and automatically calculating to obtain a measurement result. The method has the advantages of low requirement on sample positioning precision, simplicity and convenience in operation, short measurement time and high efficiency.

The utility model relates to the technical field of radiopharmaceutical activity measurement, in particular to a radiopharmaceutical activity measuring device which comprises a measuring host and an ionization chamber, the measuring host and the ionization chamber are both installed on a base, and a taking and placing mechanism used for taking and placing a sample is arranged on the base on the left side of the ionization chamber. The picking and placing mechanism comprises a bottom plate, an electric push rod is fixedly arranged at the edge of the left side of the bottom plate, a lifting connecting plate is fixedly arranged at the upper end of the electric push rod, a second shaft seat is embedded in the bottom plate on the right side of the electric push rod, a shaft bush is assembled in the second shaft seat, and a supporting rod capable of sliding up and down is inserted in the shaft bush. The upper end of the supporting rod is rotatably connected with the lifting connecting plate through a first shaft seat, and a lifting supporting arm sleeves the annular surface of the supporting rod and is connected with the measuring frame through a plug-in connecting plate. According to the utility model, through the arranged pick-and-place mechanism, a sample automatic pick-and-place function is realized, a sample can be accurately and quickly put into or taken out of the measurement cavity of the ionization chamber, the operation is convenient, and the measurement efficiency is improved.