Periodic verification device for scintillator radiation detector

Abstract

The invention particularly relates to a periodic verification device for a scintillator radiation detector. The periodic verification device comprises a 555 timer circuit and an LED lamp, wherein the 555 timer circuit and the LED lamp are embedded in the scintillator radiation detector; the LED lamp is adhered to a light-transmitting area at the front end of a photomultiplier of the scintillator radiation detector; the 555 timer circuit is connected with the LED lamp and provides a flickering light source with adjustable pulse frequency and adjustable brightness for the LED lamp. According to the periodic verification device for the scintillator radiation detector, periodic verification of the scintillator radiation detector is realized, and the stability and reliability of the scintillator radiation detector are verified without radioactive source verification.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear radiation measurement, in particular to a periodic calibration device for a scintillator radiation detector. Background Art

[0002] A large number of scintillator radiation detectors are used in nuclear technology application sites for environmental monitoring or process monitoring. Due to the high cost of installing fixed radioactive sources and their drive devices on site and the complex safety management, the radioactive sources cannot be used in time to calibrate or verify the stability and reliability of scintillator radiation detectors, resulting in the inability to verify the stability and reliability of a large number of scintillator radiation detectors in time. Summary of the invention

[0003] The object of the present invention is to provide a scintillator radiation detector periodic calibration device to achieve periodic calibration of the scintillator radiation detector and verify the stability and reliability of the scintillator radiation detector without radiation source calibration.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A scintillator radiation detector periodic calibration device comprises a 555 timer circuit and an LED lamp embedded in the scintillator radiation detector; the LED lamp is pasted on the front light-transmitting area of ​​a photomultiplier tube of the scintillator radiation detector; the 555 timer circuit is connected to the LED lamp to provide a scintillation light source with adjustable pulse frequency and brightness for the LED lamp.

[0006] As one possible implementation, a 555 timer circuit includes a 555 timer, a first resistor, a second resistor, a first capacitor, a second capacitor, a potentiometer, and a power supply;

[0007] The 555 timer has 8 pins, namely ground, low trigger, output, reset, control, high trigger, discharge and power supply.

[0008] Among them, the grounding end is grounded, the power supply end and the reset end are both externally connected to the power supply, the output end is externally connected to a potentiometer, the potentiometer is connected in series with the LED lamp and then connected to the negative electrode of the power supply; the control end is externally connected to a second capacitor, and the second capacitor is connected to the negative electrode of the power supply; the first resistor, the second resistor and the first capacitor are connected in series in sequence and then connected in parallel with the power supply; the low trigger end is externally connected between the second resistor and the first capacitor; the high trigger end is connected to the low trigger end; and the discharge end is externally connected between the first resistor and the second resistor.

[0009] As one of the possible implementations, the pulse frequency of the flashing light source emitted by the LED lamp is output by a 555 timer;

[0010] The pulse frequency output by the 555 timer is calculated and determined according to the following formula:

[0011] f=1.44 / ((R1+2×R2))×C1

[0012] Wherein, f is the pulse frequency output by the 555 timer, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, and C1 is the capacitance value of the first capacitor.

[0013] As one of the feasible ways, the pulse frequency output by 555 timer is in the range of (100~1000)HZ.

[0014] As one of the feasible ways, the height of the pulse frequency output by the 555 timer is (2-3)V.

[0015] As one possible implementation, an LED lamp is a light emitting diode.

[0016] As one of the achievable ways, the flashing light source emitted by the LED lamp is a blue LED light source, and the spectral wavelength of the flashing light source emitted by the LED lamp matches the photomultiplication period response of the photomultiplier tube of the scintillator radiation detector.

[0017] As one achievable manner, the second capacitor is a 10uF capacitor.

[0018] As one possible implementation, the resistance value of the potentiometer is 10 kΩ.

[0019] As one of the achievable ways, the power supply is a 5V DC power supply, and the ripple of the power supply does not exceed ±10mV.

[0020] Beneficial technical effects of the present invention:

[0021] The scintillator radiation detector periodic calibration device of the present invention is embedded in the scintillator radiation detector, based on a 555 timer circuit and combined with an LED lamp to realize a scintillation light source with adjustable frequency and adjustable brightness; when the stability and reliability of the scintillator radiation detector need to be calibrated, the scintillator radiation detector is periodically calibrated by turning on the power supply of the 555 timer circuit, and the stability and reliability of the scintillator radiation detector are verified without the need for radiation source calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a periodic calibration device for a scintillator radiation detector of the present invention.

[0023] In the figure, B1 is the power supply; R1 is the first resistor; R2 is the second resistor; C1 is the first capacitor; U1 is the 555 timer; R3 is the potentiometer; C2 is the second capacitor; and L1 is the LED lamp. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "left end", "right end", "above", "below", "outside", "inside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figure 1 This embodiment provides a periodic calibration device for a scintillator radiation detector, including a 555 timer circuit and an LED lamp L1 embedded in the scintillator radiation detector; the LED lamp L1 is pasted on the front light-transmitting area of ​​the photomultiplier tube of the scintillator radiation detector; the 555 timer circuit is connected to the LED lamp L1 to provide a scintillation light source with adjustable pulse frequency and adjustable brightness for the LED lamp L1.

[0028] In this embodiment, as one of the implementable ways, the 555 timer circuit includes a 555 timer U1, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a potentiometer R3 and a power supply B1;

[0029] The 555 timer has 8 pins, namely ground, low trigger, output, reset, control, high trigger, discharge and power supply.

[0030] The ground terminal is grounded, the power terminal and the reset terminal are both externally connected to a power supply, the output terminal is externally connected to a potentiometer R3, the potentiometer R3 is connected in series with the LED lamp L1 and then connected to the negative electrode of the power supply B1; the control terminal is externally connected to a second capacitor C2, and the second capacitor C2 is connected to the negative electrode of the power supply B1;

[0031] The first resistor R1, the second resistor R2 and the first capacitor C1 are connected in series in sequence and then in parallel with the power supply B1; the low trigger end is externally connected between the second resistor R2 and the first capacitor C1; the high trigger end is connected to the low trigger end; the discharge end is externally connected between the first resistor R1 and the second resistor R2.

[0032] The 555 timer U1 provides a pulse signal for the LED lamp L1; the first resistor R1, the second resistor R2 and the first capacitor C1 realize the 555 timer pulse frequency adjustment; the potentiometer R3 adjusts the brightness of the LED lamp L1; the second capacitor C2 controls the output voltage of the 555 timer to prevent high-frequency interference; the LED lamp L1 provides a scintillation light source for the calibration of the scintillator radiation detector.

[0033] When the reliability and stability of the scintillator radiation detector needs to be verified, the 555 timer circuit power supply is turned on, and the 555 timer circuit provides a flashing light source with adjustable pulse frequency and brightness for the LED lamp L1 to complete the verification of the scintillator radiation detector.

[0034] In this embodiment, as one of the achievable ways, the pulse frequency of the flashing light source emitted by the LED lamp L1 is output by the 555 timer U1;

[0035] The pulse frequency output by the 555 timer U1 is calculated and determined according to the following formula:

[0036] f=1.44 / ((R1+2×R2))×C1

[0037] Among them, f is the pulse frequency output by the 555 timer U1, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, and C1 is the capacitance value of the first capacitor.

[0038] In this embodiment, as one of the achievable methods, the pulse frequency output by the 555 timer U1 is (100-1000) Hz.

[0039] In this embodiment, as one of the achievable methods, the height of the pulse frequency output by the 555 timer U1 is (2-3)V.

[0040] In this embodiment, as one of the achievable ways, the LED lamp L1 is a light emitting diode.

[0041] In this embodiment, as one of the achievable ways, the flashing light source emitted by the LED lamp L1 is a blue LED light source, and the spectral wavelength of the flashing light source emitted by the LED lamp L1 matches the photomultiplication period response of the photomultiplier tube of the scintillator radiation detector.

[0042] In this embodiment, as one achievable manner, the second capacitor C2 is a 10uF capacitor.

[0043] In this embodiment, as one of the achievable ways, the resistance value of the potentiometer R3 is 10 kΩ.

[0044] In this embodiment, as one of the achievable ways, the power supply B1 is a 5V DC power supply, and the ripple of the power supply B1 does not exceed ±10mV.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A scintillator radiation detector periodic calibration device, characterized in that: The invention comprises a 555 timer circuit and an LED lamp embedded in a scintillator radiation detector; the LED lamp is pasted on the light-transmitting area at the front end of the photomultiplier tube of the scintillator radiation detector; the 555 timer circuit is connected with the LED lamp to provide a flashing light source with adjustable pulse frequency and brightness for the LED lamp.

2. The scintillator radiation detector periodic calibration device according to claim 1, characterized in that: The 555 timer circuit includes a 555 timer, a first resistor, a second resistor, a first capacitor, a second capacitor, a potentiometer and a power supply; The 555 timer has 8 pins, namely ground, low trigger, output, reset, control, high trigger, discharge and power supply. Among them, the grounding end is grounded, the power supply end and the reset end are both externally connected to the power supply, the output end is externally connected to a potentiometer, the potentiometer is connected in series with the LED lamp and then connected to the negative electrode of the power supply; the control end is externally connected to a second capacitor, and the second capacitor is connected to the negative electrode of the power supply; the first resistor, the second resistor and the first capacitor are connected in series in sequence and then connected in parallel with the power supply; the low trigger end is externally connected between the second resistor and the first capacitor; the high trigger end is connected to the low trigger end; and the discharge end is externally connected between the first resistor and the second resistor.

3. The scintillator radiation detector periodic calibration device according to claim 2, characterized in that: The pulse frequency of the flashing light source emitted by the LED lamp is output by the 555 timer; The pulse frequency output by the 555 timer is calculated and determined according to the following formula: f=1.44 / ((R1+2×R2))×C1 Wherein, f is the pulse frequency output by the 555 timer, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, and C1 is the capacitance value of the first capacitor.

4. The scintillator radiation detector periodic calibration device according to claim 3, characterized in that: The pulse frequency output by the 555 timer is (100~1000)HZ.

5. The periodic calibration device for scintillator radiation detector according to claim 2, characterized in that: The output pulse frequency of the 555 timer is between (2 and 3)V.

6. The periodic calibration device for scintillator radiation detector according to claim 2, characterized in that: The second capacitor is a 10uF capacitor.

7. The periodic calibration device for scintillator radiation detector according to claim 2, characterized in that: The resistance value of the potentiometer is 10kΩ.

8. The periodic calibration device for scintillator radiation detector according to claim 2, characterized in that: The power supply is a 5V DC power supply, and the ripple of the power supply does not exceed ±10mV.

9. The scintillator radiation detector periodic calibration device according to claim 1, characterized in that: LED lights are light emitting diodes.

10. The scintillator radiation detector periodic calibration device according to claim 1, characterized in that: The flashing light source emitted by the LED lamp is a blue LED light source, and the spectrum wavelength of the flashing light source emitted by the LED lamp matches the photomultiplication period response of the photomultiplier tube of the scintillator radiation detector.

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