Abstract: A pressure-regulating large-area windowless airflow proportional counter is provided, which includes a chamber, a metal tray, a side cover, a gas cylinder, and a voltage input and signal output terminal. The chamber has a side opening. A large-area source is placed on the metal tray and the metal tray is moved into or out of the chamber via the side opening. The side cover is fixed to the side opening by an O-ring via a locking device to form an airtight structure. The gas cylinder is used to supply a dedicated gas into the chamber. The voltage-input/signal-output terminal is used to supply voltage to an anode wire net. The free electrons generated by the large-area source due to the free phenomenon are collected by the anode wire net, and outputted to a voltage signal processing module through the voltage-input/signal-output terminal for analysis of pulse height or pulse count.

Abstract: A pressure-regulating large-area windowless airflow proportional counter is provided, which includes a chamber, a metal tray, a side cover, a gas cylinder, and a voltage input and signal output terminal. The chamber has a side opening. A large-area source is placed on the metal tray and the metal tray is moved into or out of the chamber via the side opening. The side cover is fixed to the side opening by an O-ring via a locking device to form an airtight structure. The gas cylinder is used to supply a dedicated gas into the chamber. The voltage-input/signal-output terminal is used to supply voltage to an anode wire net. The free electrons generated by the large-area source due to the free phenomenon are collected by the anode wire net, and outputted to a voltage signal processing module through the voltage-input/signal-output terminal for analysis of pulse height or pulse count.

Abstract: A device for measuring low currents is proposed to include: a transimpedance amplifier to convert an analog current signal into an analog voltage signal; an analog-to-digital converter to acquire a graph that plots a curve representing variation of the analog voltage signal using digital codes; a statistic module to acquire a set of crossing numbers by: for each of the digital codes, making a straight line that has a constant value equaling the digital code across time in the graph, and counting a number of crossings of the curve with the straight line; and an analysis module to analyze distribution of the crossing numbers, and to output an output code based on the distribution of the crossing numbers.

Abstract: A calibration and measurement system for measuring a radioactive specific activity of an analyte pipe includes a calibration pipe, a standard radiation source, a radiation detector, a robot connected and a processing unit. The diameter of the inner wall of the calibration pipe is the same as the analyte pipe. The standard radiation source is surfaced over the inner wall of the calibration pipe and with a standard radioactive activity of a radioactive nuclide. The radiation detector is with a detection efficiency for detecting radiation. The radiation detector is for measuring the standard radioactive activity of the radioactive nuclide and a calibration net count rate thereof or measuring a radiation net count rate of the analyte pipe. The robot is connected with the radiation detector and moves in the calibration pipe or the analyte pipe. The processing unit calculates the detection efficiency and the radioactive specific activity.

Abstract: The invention provides a calibration method for bulk radiation wastes. The calibration method for bulk radiation method for bulk radiation wastes including the following steps. First, pluralities of objects are provided. Then, the plurality of objects arranged into calibration member. In addition, a measurement system and a measurement method for bulk radiation wastes are provided.

Abstract: A device for measuring low currents is proposed to include: a transimpedance amplifier to convert an analog current signal into an analog voltage signal; an analog-to-digital converter to acquire a graph that plots a curve representing variation of the analog voltage signal using digital codes; a statistic module to acquire a set of crossing numbers by: for each of the digital codes, making a straight line that has a constant value equaling the digital code across time in the graph, and counting a number of crossings of the curve with the straight line; and an analysis module to analyze distribution of the crossing numbers, and to output an output code based on the distribution of the crossing numbers.

Abstract: By using a scintillation surveymeter with good calibration performance evaluation for a secondary standard radiation field, and a working standard part obtaining an ambient dose equivalent rate, in cooperation with a portable irradiator, and an irradiator lifter, a laser range finder and a laser locator of a relevant radiation source, in-situ calibration is capable of being performed on fixed, or large-scale, or continuous monitoring type radiation monitors to be calibrated stationed in nuclear power plants, nuclear medical departments, and other nuclear facility operating institutions. Moreover, a time-efficient and effective in-situ calibration method is further provided, which can be performed based upon a standard calibration field that is achieved using a portable 137Cs radiation source.

Abstract: By using a scintillation surveymeter with good calibration performance evaluation for a secondary standard radiation field, and a working standard part obtaining an ambient dose equivalent rate, in cooperation with a portable irradiator, and an irradiator lifter, a laser range finder and a laser locator of a relevant radiation source, in-situ calibration is capable of being performed on fixed, or large-scale, or continuous monitoring type radiation monitors to be calibrated stationed in nuclear power plants, nuclear medical departments, and other nuclear facility operating institutions. Moreover, a time-efficient and effective in-situ calibration method is further provided, which can be performed based upon a standard calibration field that is achieved using a portable 137Cs radiation source.

Abstract: A computerized chart recorder is revealed, comprises a signal conversion unit, an operation control unit, a printing control unit, and a database. A signal conversion unit receives measurement signals of a measurement instrument, and converts the measurement signals to signal conversion data. A operation control unit receives the signal conversion data required for printing, produces corresponding chart data, and prints the curve of signal variations, which can be also displayed on a human-machine interface unit. Whether to store the data or to print can be determined. Besides, the data can be also transmitted to a printing control unit. When the printing control unit is activated, it can receive the chart data and the quality assurance data, and control a printing unit to emulate the chart recorder for executing chart recording. In addition, the quality assurance data can be printed as well for complying with the requirements of the quality-assurance operations.

Abstract: A metal volume source calibration phantom includes a container, a plurality kinds of metal plates stacked up inside the container, and at least one slab of radioactive source, each of which is disposed between the adjacent metal plates and includes a plurality of radionuclides. By means of inserting different numbers of the plurality kinds of metal plates inside the container, it is capable of obtaining the metal volume source calibration phantoms with different densities. In addition, a method for calibrating the metal volume source calibration phantom is also provided, which starts by the step of providing the metal calibration phantoms with different densities by inserting different numbers of a plurality kinds of metal plates and at least one slab of radioactive source into the container, and then detecting counting efficiency with respect to the metal volume calibration phantoms having different densities by a waste curie monitor so as to establish the correlation between density and counting efficiency.

Abstract: A computerized chart recorder is revealed, comprises a signal conversion unit, an operation control unit, a printing control unit, and a database. A signal conversion unit receives measurement signals of a measurement instrument, and converts the measurement signals to signal conversion data. A operation control unit receives the signal conversion data required for printing, produces corresponding chart data, and prints the curve of signal variations, which can be also displayed on a human-machine interface unit. Whether to store the data or to print can be determined. Besides, the data can be also transmitted to a printing control unit. When the printing control unit is activated, it can receive the chart data and the quality assurance data, and control a printing unit to emulate the chart recorder for executing chart recording. In addition, the quality assurance data can be printed as well for complying with the requirements of the quality-assurance operations.

Abstract: A metal volume source calibration phantom includes a container, a plurality kinds of metal plates stacked up inside the container, and at least one slab of radioactive source, each of which is disposed between the adjacent metal plates and includes a plurality of radionuclides. By means of inserting different numbers of the plurality kinds of metal plates inside the container, it is capable of obtaining the metal volume source calibration phantoms with different densities. In addition, a method for calibrating the metal volume source calibration phantom is also provided, which starts by the step of providing the metal calibration phantoms with different densities by inserting different numbers of a plurality kinds of metal plates and at least one slab of radioactive source into the container, and then detecting counting efficiency with respect to the metal volume calibration phantoms having different densities by a waste curie monitor so as to establish the correlation between density and counting efficiency.

Abstract: An ionization chamber includes a chamber, two outer electrode plates and a center electrode plate. The center electrode plate is disposed at the center of the chamber, and signals produced in the chamber can be collected completely by the center electrode plate to avoid signal losses and improve the accuracy of the test result of the ionization chamber. The center electrode plate also can maintain a constant internal volume of the chamber and prevent a change of effective volume within the chamber due to a change of electric field and enhance the stability of the test result of the ionization chamber. A guard electrode is wrapped by an insulation pin of the electrode and the outer insulation ring to form an insulation shield that can greatly reduce current leakage of the protection electrode and improve the accuracy of the test result of the ionization chamber.

Abstract: A rod radiation source and its calibration phantom structure mainly have an anti-leak filter layer on one side of a lower lamination layer, and have the anti-leak filter layer evenly deposited with plural drops of liquid radiation sources with each drop of radiation source neighboring but not overlapping, and use an upper lamination layer to cover the anti-leak filter layer to protect each radiation source, and have the above assembly rolled into a rod as a rod radiation source. In another cylindrical container that has a stack of plural sheets, the rod radiation sources get evenly distributed along the axle center and pass each sheet to form a calibration phantom structure for a rod radiation source.

Abstract: A rod radiation source and its calibration phantom structure mainly have an anti-leak filter layer on one side of a lower lamination layer, and have the anti-leak filter layer evenly deposited with plural drops of liquid radiation sources with each drop of radiation source neighboring but not overlapping, and use an upper lamination layer to cover the anti-leak filter layer to protect each radiation source, and have the above assembly rolled into a rod as a rod radiation source. In another cylindrical container that has a stack of plural sheets, the rod radiation sources get evenly distributed along the axle center and pass each sheet to form a calibration phantom structure for a rod radiation source.

Abstract: A drum-type volume source calibration phantom is provided, which comprises a drum-type container; a plurality of plate groups stacking up inside the drum-type container, at least one slab of radioactive source, each of which is disposed between the adjacent plate groups and comprises a plurality of radionuclides. The present invention further provides a calibration method that starts by the step of providing a radioactivity test for each drum-type volume calibration phantom. Then, a calibration relationship of density vs. counting efficiency corresponding to the several different drum-type volume source calibration phantoms is performed in a waste curie monitor. Finally, a characteristic of photonic energy dependency is measured for a modification factor.

Abstract: A volume calibration phantom comprises a container; a plurality of plates stacking up inside the container; and at least one slab of radioactive source, each of which is disposed between the adjacent plates and comprises a plurality of radionuclides. With the volume calibration phantoms, the present invention further provides a calibration method which is an improvement over conventional calibration methods of space geometric center point source and relative penetration factor ratios. The method comprises the steps of generating a calibration curve of density vs.

Abstract: A volume calibration phantom is disclosed in the present invention, which comprises a container; a plurality of plates stacking up inside the container; and at least one slab of radioactive source, each of which is disposed between the adjacent plates and comprises a plurality of radionuclides. With the volume calibration phantoms, the present invention further provides a calibration method which is an improvement over conventional calibration methods of space geometric center point source and relative penetration factor ratios. The method comprises the steps of generating a calibration curve of density vs.

Abstract: A penetration ionization chamber includes a chamber, two outer electrode plates and a center electrode plate. The center electrode plate is disposed at the center of the chamber, and signals produced in the chamber can be collected completely by the center electrode plate to avoid signal losses and improve the accuracy of the test result of the ionization chamber. The center electrode plate also can maintain a constant internal volume of the chamber and prevent a change of effective volume within the chamber due to a change of electric field and enhance the stability of the test result of the ionization chamber. A protection electrode is wrapped by an insulation pin of the electrode and the outer insulation ring to form an insulation shield that can greatly reduce current leakage of the protection electrode and improve the accuracy of the test result of the ionization chamber.