44results about "Electrostatic dosimeters" patented technology

The present invention relates to a dosimetry device for verification of quality of a radiation beam in standard and conformal radiation therapy, and for IMRT (Intensity Modulated Radiation Therapy) applications. The device includes an active area comprising individual radiation detectors. The active area comprises a limited number of lines of radiation detectors, and a number of extra radiation detectors dedicated to the energy measurement of electrons or photons. It also comprises a build-up plate with energy degraders. The energy degraders are located upstream from the extra radiation detectors in the path of the radiation beam.

The invention relates to a three-dimensional dosage verification apparatus. The apparatus comprises a computer control platform, a multichannel electrometer provided with a three-dimensional dosage measuring head and a three-dimensional water body provided with a three-dimensional motion support arm; a computer control platform is connected with the multichannel electrometer and the three-dimensional water body; the multichannel electrometer is connected with the three-dimensional dosage measuring head; the three-dimensional water body is fixedly connected with the three-dimensional motion support arm; the three-dimensional dosage measuring head is fixedly connected with the three-dimensional motion support arm; the computer control platform is connected with the three-dimensional dosage measuring head through the multichannel electrometer to form a measuring function; and the computer control platform controls the three-dimensional dosage measuring head to perform space translational motion through the three-dimensional motion support arm. The invention provides a multimode three-dimensional measuring apparatus based on the water body and an ionization chamber detector, and a radiation treatment plan three-dimensional verification apparatus and method based on a heavy ion stereo measuring method and a three-dimensional gamma factor analysis method. The functions are diversified, the operation is convenient, the verification result is visual and accurate, the efficiency is high, the cost is low, and the system errors are small.

The invention provides a real-time monitoring method of each component beam intensity and injection dosage of mixed ion beams. The monitoring method is based on the fact that magnification coefficient is only related with intrinsic property of incidence ions if material quality and thickness of a solid slice remain unchanged when the ions penetrate through the solid slice, and magnification coefficient of the beams changes with change of the material quality or the thickness of the solid slice. Change of strength or integral quantity of the beams around the time when the incident mixed ions penetrate through the solid slice is measured according to the physical law and characteristics, so that beam strength or injection dose of each ion component can be determined when the mixed ion beams irradiate samples. The real-time monitoring method has no special limit on type and number of each component ion of the mixed ion beam to be measured, mutual proportional relation between beam strength and stability. The real-time monitoring method is simple and clear, low in cost and reliable in use.

The invention provides a body cavity inner dose sensor capable of being inserted in a catheter (attached image B) of an applicator (attached image A). In a high dose rate brachytherapy process, the dose sensor is implanted in a body cavity of a patient through the applicator so as to achieve real-time continuous detection of body cavity internal irradiation dose values of a radioactive source to a target tumor. A detector has the advantages of being good in instantaneity, small in volume, high in sensitivity and stability, easy to integrate and the like. Simultaneously, a high dose rate brachytherapy system integrating the body cavity inner dose sensor is further provided.

The invention belongs to the technical field of radiation monitoring and particularly relates to an automatic measurement system and method of an extrapolation ionization chamber. The system comprises an electrometer which is connected with the extrapolation ionization chamber, a direct-current power supply unit of the electrometer is connected with an electrode plate of the extrapolation ionization chamber and used for providing power for the extrapolation ionization chamber, a charge measurement unit of the electrometer is connected with a collector electrode of the extrapolation ionization chamber and used for measuring ionization current of the extrapolation ionization chamber, the electrometer is connected with a computer which is used for controlling performing of measuring operation, the extrapolation ionization chamber is provided with a counter electrode distance adjusting device, the counter electrode distance adjusting device is connected with a programmable logic controller (PLC), and the PLC is connected with the computer. According to the automatic measurement system and method of the extrapolation ionization chamber, the operation is simplified, measuring errors are reduced, and the measuring stability is improved.

The invention relates to the technical field of proton adsorbed dose research, and specifically relates to a high-energy proton beam density distribution testing device. The device comprises a vacuum cavity, a Faraday cup, a multi-dimensional moving platform, a shielding box and a static electrometer, wherein the Faraday cup is fixed in the vacuum cavity through the multi-dimensional moving platform, and is enabled to be opposite to a proton beam in the vacuum cavity. The Faraday cup is connected with the input end of the static electrometer in the shielding box, and a grounding end of the static electrometer and the Faraday cup are connected with a side wall of the vacuum cavity through grounding lines. A motor controller in the shielding box is connected with the multi-dimensional moving platform, and can control the multi-dimensional moving platform to move. The device provided by the invention can test the density distribution of the high-energy proton beam in the vacuum cavity, and can achieve the comprehensive assessment of a charge environment in an electronic sample room. The impact on the device from the external interference is small, and the device can effectively detect the density distribution of the high-energy proton beam.

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.

The invention discloses an emergency radiation monitoring and announcing system suitable for high-temperature reactor off-site emergency simplification. The system comprises a monitoring terminal which monitors the intensity of radiation around a high-temperature gas-cooled reactor, a processing server which is arranged near the high-temperature gas-cooled reactor and connected with the monitoring terminal and is used for receiving and processing a monitoring signal of the monitoring terminal, a decision server which is connected with the processing server and is used for receiving the processed monitoring signal and issuing a decision order, a mobile terminal which is connected with the processing server and is used for receiving a notification signal of the processing server, and an instruction terminal which is connected with the processing server and is used for receiving an instruction signal of the processing server and giving an instruction. Thus, only few monitoring terminals need to be set inside a nuclear power plant or in a near area outside a nuclear power plant, the monitoring scope is small, and the number of monitoring terminals used is small. The use cost of the whole system is reduced, and the whole emergency system is simple in structure and flexible in use.

A new type of radon progeny monitor called an electret radon progeny integrating sampling unit (E-RPISU) using an electret ion chamber to measure radon progeny concentration. A conventional 1 LPM particulate air sampling system is used to collect the radon progeny on a roughly 3.5 cm² filter that is mounted on a side of an electret ion chamber such that the collected progeny are exposed to the inside of the chamber. Alpha radiation emitted by the progeny collected on the filter ionizes the air in the approximately 220 ml chamber. Ions of opposite polarity collect on the surface of the electret of suitable thickness and reduce its surface voltage. A specially built surface voltmeter is used to measure the electret voltage before and after sampling. The electret voltage drop that occurs during the sampling period is proportional to the time integrated progeny concentration. A similar unit with a screen in the place of filter is used to measure unattached progeny concentration. Another similar unit without filter is used to provide background response to compute net progeny concentration and also to compute radon concentration.

The invention discloses a device for measuring quantity of personal radioactive rays. The device comprises a shell and a circuit board arranged in the shell, wherein, a G-M (Geiger-Muller) counter tube window is arranged at the side part of the shell; the circuit board comprises a singlechip, a liquid crystal display (LCD), a display driver, a G-M counter tube and a key switch; the output terminal of a step-up transformer is electrically connected with the input terminal of a rectifying and filtering circuit; the output terminal of the rectifying and filtering circuit is electrically connected with one end of the G-M counter tube; the other end of the G-M counter tube is electrically connected with the positive electrode of a third diode; the negative electrode of the third diode is electrically connected with one end of a third capacitor; the other end of the third capacitor is electrically connected with the base electrode of a triode; a fourth capacitor is electrically connected with the SCM; an alarm indication circuit comprises a light-emitting diode (LED) and a buzzer which are connected in parallel; the parallel circuit for the LED and the buzzer is electrically connected with the singlechip; and the G-M counter tube window is positioned outside the middle part of the G-M counter tube. The device disclosed by the invention has the advantages of high sensitivity and wide measurement range.

The invention relates to the field of environment protection and monitoring devices and particularly relates to a miniature radiation environment automatic monitoring station. The miniature radiation environment automatic monitoring station comprises a high pressure ionization chamber, a sodium iodide spectrometer, an automatic weather station, a control system, a communication module and a power supply system. The automatic weather station measures meteorological parameters under an environment. The high pressure ionization chamber and the sodium iodide spectrometer measure the [gamma] dose rate. The sodium iodide spectrometer is used for exploring natural nuclide, industrial nuclide, medical nuclide, artificial nuclide and the like. A data collector performs collection, storage, operation, analysis and processing of monitoring data of the radiation environment automatic monitoring station. The monitoring data is processed by a computer and then is sent via the communication module, so that the integrated control of an overall monitoring process is completed. The miniature radiation environment automatic monitoring station is novel in structure, high in integrated level, small in size, light in weight, convenient to transport and high in intelligentization degree, can be used in severe environments, and has a great popularization value.

The invention discloses a wide-range coaxial through-wall double ionization chamber region gamma radiation detection method. The method comprises the following steps of: 1, constructing a detector; 2, making a high-range zeroing circuit work and solidifying the high-range zeroing circuit work; 3, installing a detector; 4, setting the working time interval of a low-range zeroing circuit, and starting the detector; 5, making the low-range zero setting circuit work; 6, gating a first high-range signal acquisition circuit; 7, gating a second high-range signal acquisition circuit; 8, gating a second low-range signal acquisition circuit; 9, gating a first low-range signal acquisition circuit; and 10, ending the timing of the low-range zeroing circuit, and circulating the steps 5-9 to realize the long-term continuous detection of the gamma radiation in a wide-range coaxial through-wall double-ionization chamber region. The four gamma radiation detection circuits for different grades are circularly switched; in order to ensure that the circuits fail due to negative drift of field effect geminate transistors during background measurement in each cycle, the low-range zeroing circuit is specially designed to adjust the zero point of the geminate transistors, and zeroing processing is carried out on the low-range signal acquisition circuit.

Disclosed is a method for the detection of radiation-induced damage on a biomaterial using a magnetic sensor, and a magnetic sensor biochip for biodosimetry. Designed to utilize a magnetic sensor in detecting damage to biomaterials in vitro, the method and magnetic sensor biochip can accurately determine the degree of damage irrespective of the self-recovery of the organism. Thanks to their high sensitivity, the method and biochip can detect the biomaterial damage by exposure to even a low dose of radiation.

An energy cell, employed as a passive energy source or a detector for sensing high energy photons, takes advantage of the differing electrical properties of metals to produce an induced electromagnetic force charge when exposed to dosages of high energy photons such as x-ray or gamma rays.

The invention belongs to the technical field of radiation monitoring, and particularly relates to a beta radiation dose equivalent magnitude transmission ionization chamber which comprises an annular ionization chamber outer wall (9), an ionization chamber base (6) arranged on a bottom end opening of the ionization chamber outer wall (9) in a sealed mode, a high-voltage electrode (5) arranged in the ionization chamber outer wall (9) and parallel to the ionization chamber base (6) and a collector assembly. And the collector assembly is close to the ionization chamber base (6). According to the invention, the personal dose equivalent Hp (0.07) and the personal dose equivalent Hp (3) can be directly measured; according to the invention, the transmission ionization chamber is directly connected with the electrometer of a general type by using the three coaxial cables; the method does not need to be equipped with special signal reading equipment, and has the characteristics of flexibility and easiness in use.

The invention discloses a device for measuring the rotary output dose of a spiral fault treatment device, and the device comprises a die body and a first plunger, a first plunger groove is disposed in the axial direction of the die body, the first plunger groove is disposed at the axis of the die body, and the first plunger is disposed in the first plunger groove and coincides with the first plunger groove. An electrometer slot is arranged in the middle of the first plunger. Due to the fact that the size of the electrometer slot can be designed to be the size of an ionization chamber of a conventional electrometer, universality is improved. Secondly, when the device is used for measuring the rotary output dose of the spiral fault treatment device, the electrometer is located below the axis of the die body, and after the first plunger is taken out and inserted upside down, and the first plunger is inserted into the first plunger groove, the electrometer slot and the die body are coaxial; the measuring device is beneficial for measuring the change index of the linearly moving treatment beam along with the change of the equipment angle position and the rotation of the frame.

The invention provides a detection device and detection system for a medical accelerator. The detection device comprises a first fixed portion, a second fixed portion, a first sliding portion, at least one first driven wheel, a second sliding portion, at least one second driven wheel, at least one driving wheel, a mounting bracket, a third fixed portion, a third sliding portion, a fourth fixed portion, a fourth sliding portion and an ionization chamber, wherein the first fixed portion and the second fixed portion are located at two sides of the bottom end of an accelerator support respectively, the first sliding portion is slidably connected with the first fixed portion; the at least one first driven wheel is installed at the first sliding portion, the second sliding portion is slidably connected with the second fixed portion, the at least one second driven wheel is installed at the second sliding portion, the at least one driving wheel is installed at the second sliding portion, the mounting bracket is connected with the first sliding portion and the second sliding portion, the third fixed portion is mounted at the top end of the mounting bracket and parallel to a horizontal plane, the third sliding portion is slidably connected with the third fixed portion, the fourth fixed portion is installed at the third sliding portion and vertical to the third sliding portion, the fourth sliding portion is slidably connected with the fourth fixed portion, and the ionization chamber is installed at the bottom end of the fourth sliding portion and acquires radiation data of the accelerator. With the detection device and detection system provided by the invention adopted, harm to testing personnel can be reduced, and real-time detection for the medical accelerator can be realized.

The invention relates to a radial measuring instrument for measuring radial dosage. The radial measuring instrument for measuring radial dosage comprises a photoelectric sensor, a first amplifying circuit, an integral circuit, a second amplifying circuit, a analog to digital to digital (A /D) converter, a single chip and a displaying circuit. The first amplifying circuit is composed of a first differential amplification circuit, a first calibration voltage circuit and a first inverse proportion amplifying circuit. The second amplifying circuit is composed of a second differential amplification circuit, a second calibration voltage circuit and a second inverse proportion amplifying circuit. The radial measuring instrument for measuring the radial dosage is characterized by further comprising a first alarm circuit and a second alarm circuit. The input end of the first alarm circuit is connected with the output end of the first inverse proportion amplifying circuit. The input end of the second alarm circuit is connected with the output end of the second inverse proportion amplifying circuit. The radial measuring instrument for measuring the radial dosage has the advantages that manpower and material resources of making radial exposure charts are reduced and work efficiency is improved.