CN113238272A - Radon exhalation rate measuring instrument - Google Patents
Radon exhalation rate measuring instrument Download PDFInfo
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- CN113238272A CN113238272A CN202110460862.2A CN202110460862A CN113238272A CN 113238272 A CN113238272 A CN 113238272A CN 202110460862 A CN202110460862 A CN 202110460862A CN 113238272 A CN113238272 A CN 113238272A
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- radon
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/167—Measuring radioactive content of objects, e.g. contamination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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Abstract
The invention relates to the technical field of radon measurement, and provides a radon exhalation rate measuring instrument which comprises an exhalation cover, a radon measurement chamber and a detector.
Description
Technical Field
The invention relates to the technical field of radon measurement, in particular to a radon exhalation rate measuring instrument.
Background
The existing radon measuring instrument mainly uses the radon measuring principle that air on the surface of an object to be measured flows into a radon measuring chamber, as shown in fig. 1, the radon measuring instrument and a precipitation cover are separately arranged, an air pump is arranged in the radon measuring instrument, and the air on the surface of the object to be measured flows into the radon measuring instrument under the action of the air pump to be measured.
However, the forced air circulation inevitably generates pressure difference, when the pressure on the surface of the object to be detected is different from that in the natural state, the content of radon gas on the surface of the object to be detected is also different from that in the natural state, and the detection accuracy is influenced by the measurement method.
Disclosure of Invention
In order to solve the problems, the invention provides a radon exhalation rate measuring instrument which comprises an exhalation cover, a radon measurement chamber and a detector, wherein a collecting electric field is formed by arranging the radon measurement chamber in the exhalation cover and enabling a voltage difference to exist between the detector and the radon measurement chamber, and radon daughter generated after radon decay is provided with positive charges and tends to the side with low potential in the electric field, so that the radon exhalation rate of the surface of an object to be measured in a natural state is measured.
In some embodiments of the present application, a radon exhalation rate measuring instrument is disclosed for detecting a radon exhalation rate of a material to be measured, and is characterized by comprising: the precipitation cover is of a shell structure with an opening formed in one surface, and the opening is attached to the surface of the material to be detected; the radon measuring chamber is arranged inside the precipitation cover and used for detecting the concentration of radon; and the probe of the detector is arranged in the shell, and the probe and the radon measuring cavity form a collecting electric field.
In some embodiments of the present application, the radon measuring chamber is a housing with a first voltage value, the detector is disposed inside the radon measuring chamber, and the detector has a second voltage value, wherein the first voltage value is greater than the second voltage value.
In some embodiments of the present application, a through hole is provided on the housing of the radon measuring chamber, and the through hole is provided in plurality.
In some embodiments of the present application, the extraction hood is provided as an insulating material.
In some embodiments of the present application, the precipitation shield is a metallic material and is grounded.
In some embodiments of the present application, the detector is a negative high voltage detector, the radon measuring chamber is located inside the precipitation cover, and the precipitation cover is made of a conductive material and grounded.
In some embodiments of this application, still including the protection shield, the protection shield sets up the opening part will the opening with the radon measuring cavity is kept apart, just be provided with the air vent on the protection shield, the air vent is provided with a plurality ofly, makes the opening part with the radon measuring cavity keeps the circulation of air.
In some embodiments of the present application, the negative high voltage detector includes a negative high voltage power supply, a high voltage filtering and voltage dividing circuit, a charge sensitive amplifier and a probe, the negative high voltage power supply is connected to the high voltage filtering and voltage dividing circuit, and the negative high voltage power supply provides negative high voltage for the high voltage filtering and voltage dividing circuit; the probe is electrically connected with the high-voltage filter circuit and is used for loading negative high voltage; the charge sensitive amplifier is electrically connected with the high-voltage filtering and voltage-dividing circuit and is used for amplifying the electric signal detected by the probe.
Compared with the prior art, the radon exhalation rate measuring instrument provided by the embodiment of the invention has the beneficial effects that:
the radon measuring chamber is arranged inside the precipitation cover, and the radon measuring chamber and the detector form a collecting electric field, so that the precipitation rate of radon of a measured object in a natural state is measured, and the measurement accuracy is improved; by enabling the voltage value of the radon measuring chamber to be larger than that of the detector, radon daughter with positive charges tends to the detector, and the integrity of radon exhalation rate measurement is guaranteed; the precipitation cover is made of an insulating material or is grounded, so that the safety of the radon precipitation rate measuring instrument is further ensured, and the use danger caused by electric leakage is avoided; still through directly setting up the precipitation cover as the radon measuring cavity, precipitation cover ground connection, the detector sets up to negative high voltage detector, has simplified overall structure and insulating step, has reached same detection effect.
Drawings
FIG. 1 is a schematic diagram of a radon exhalation rate measuring instrument of the prior art;
FIG. 2 is a schematic diagram of a radon exhalation rate measuring instrument in the embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a radon exhalation rate measuring instrument in embodiment 2 of the present invention;
fig. 4 is a schematic diagram of a negative high voltage detector in an embodiment of the invention.
In the figure, 100, an object to be measured; 200. a precipitation cover; 300. a radon measuring chamber; 400. a detector; 410. a negative high voltage detector; 411. a negative high voltage power supply; 412. a high-voltage filtering voltage-dividing circuit; 413. a charge sensitive amplifier; 414. a probe; 500. and (5) protecting the board.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The following is a description of preferred embodiments of the present invention with reference to the accompanying drawings.
In some embodiments of the present application, as shown in fig. 2, a radon exhalation rate measuring instrument is disclosed, which comprises: the radon measuring device comprises a precipitation cover 200, a radon measuring chamber 300 and a detector 400, wherein the precipitation cover 200 is of a shell structure with an opening formed in one surface, the opening is attached to the surface of an object 100 to be measured when the radon measuring device is used, the radon measuring chamber 300 is arranged inside the precipitation cover 200, a probe 414 of the detector 400 is arranged inside the precipitation cover 200, the probe 414 and the radon measuring chamber 300 have different voltages, a voltage difference is formed between the probe 414 and the radon measuring chamber 300, and a collecting electric field is formed.
There will be several scenarios for the construction of the exhalation hood 200 and radon measuring chamber 300:
example 1:
as shown in fig. 2, the radon measuring chamber 300 is a housing structure and is disposed inside the precipitation housing 200, wherein the housing of the radon measuring chamber 300 is charged and the charge amount is a first voltage value, the detector 400 has two parts, namely a processing circuit and a probe 414, the probe 414 partially extends into the radon measuring chamber 300 and has a second voltage value, wherein the first voltage value is greater than the second voltage value, and the radon measuring chamber 300 with a positive high voltage and the probe 414 with a low voltage form an electrostatic field.
The housing of the radon measuring chamber 300 is provided with a plurality of through holes which are distributed at each position of the housing, so that the outside air can be freely diffused into the radon measuring chamber 300.
Still be provided with protection shield 500 in appearing cover 200, protection shield 500 sets up the opening part at appearing cover 200, the lid is established at the opening part, keep apart opening and external intercommunication department and radon measuring cavity 300, be provided with the air vent on protection shield 500 simultaneously, the air vent on protection shield 500 is provided with a plurality ofly, make opening and radon measuring cavity 300 keep the circulation of air, make the radon molecule on object 100 surface that awaits measuring normally enter into radon measuring cavity 300, keep apart electrified part and external simultaneously, in order to avoid using accidental contact to take place danger.
Because the radon measuring chamber 300 has positive high voltage, an insulating material needs to be arranged between the radon measuring chamber 300 and the precipitation cover 200, and in addition, the precipitation cover 200 is arranged to be the insulating material or when the precipitation cover 200 is made of a metal material, the precipitation cover 200 is grounded, so that the external voltage of the precipitation cover 200 is ensured to be zero, and the use safety of the radon precipitation rate measuring instrument is ensured.
The radon daughter generated by decay of radon has positive charges, and after the radon daughter with the positive charges enters the radon measuring chamber 300, the radon daughter with the positive charges is far away from the shell with the positive high voltage and tends to the probe 414 with the low voltage, so that the radon daughter is collected by the probe 414, and then the electrical signal of the radon daughter is transmitted to the processing circuit, and the radon exhalation rate of the object to be measured in a natural state is obtained.
Example 2:
as shown in FIG. 3, the inside of the shell of the precipitation hood 200 is the radon measuring chamber 300, the probe 414 of the detector 400 is arranged inside the precipitation hood 200, the detector 400 is a negative high voltage detector 410, the shell of the precipitation hood 200 is made of a conductive material, the precipitation hood 200 is grounded, and the zero voltage shell and the negative high voltage detector 400 form a collecting electric field for collecting the radon daughter of positive charges.
Because the shell is subjected to grounding treatment and has zero voltage, the precipitation cover 200 does not need insulation treatment, the structure and the volume of the measuring instrument with the radon precipitation rate are greatly simplified, and the insulation process is simplified.
Still be provided with protection shield 500 in appearing cover 200, protection shield 500 sets up the opening part at appearing cover 200, the lid is established at the opening part, keep apart opening and external intercommunication department and radon measuring cavity 300, be provided with the air vent on protection shield 500 simultaneously, the air vent on protection shield 500 is provided with a plurality ofly, make opening and radon measuring cavity 300 keep the circulation of air, make the radon molecule on object 100 surface that awaits measuring normally enter into radon measuring cavity 300, keep apart electrified part and external simultaneously, in order to avoid using accidental contact to take place danger.
As shown in fig. 4, the negative high voltage detector 410 includes a negative high voltage power supply 411, a high voltage filtering voltage-dividing circuit 412, a charge sensitive amplifier 413 and a probe 414, the negative high voltage power supply 411 is connected to the high voltage filtering voltage-dividing circuit 412, and the negative high voltage power supply 411 provides a negative high voltage for the high voltage filtering voltage-dividing circuit 412; the probe 414 is electrically connected with the high-voltage filter circuit, and the probe 414 is used for loading negative high voltage; the charge sensitive amplifier 413 is electrically connected with the high-voltage filtering and voltage-dividing circuit 412 and is used for amplifying the electric signal detected by the probe 414; the negative high voltage power supply 411, the high voltage filter voltage division circuit 412 and the charge sensitive amplifier 413 are arranged inside the negative high voltage detector 410, and the probe 414 is arranged outside the negative high voltage detector 410.
The high-voltage filter voltage-dividing circuit 412 and the charge sensitive amplifier 413 are arranged in the negative high-voltage detector 410, so that the circuit stability and the stability of an electric signal of the negative high-voltage detector 410 are improved.
In summary, the embodiment of the present invention provides a radon exhalation rate measuring instrument, wherein a radon measurement chamber 300 is disposed inside a exhalation cover 200, and the radon measurement chamber 300 and a detector 400 form a collecting electric field, so as to measure the exhalation rate of radon of a measured object in a natural state, thereby improving the measurement accuracy; by enabling the voltage value of the radon measuring chamber 300 to be larger than that of the detector 400, radon daughter with positive charges tends to the detector 400, and the integrity of radon exhalation rate measurement is guaranteed; the precipitation cover 200 is made of insulating materials or the precipitation cover 200 is grounded, so that the safety of the radon precipitation rate measuring instrument is further ensured, and the use danger caused by electric leakage is avoided; the precipitation cover 200 is directly arranged into the radon measuring chamber 300, the precipitation cover 200 is grounded, and the detector 400 is arranged into the negative high-voltage detector 410, so that the overall structure and the insulation step are simplified, and the same detection effect is achieved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. A radon exhalation rate measuring instrument is used for detecting radon exhalation rate of a material to be measured, and is characterized by comprising:
the precipitation cover is of a shell structure with an opening formed in one surface, and the opening is attached to the surface of the material to be detected;
the radon measuring chamber is arranged inside the precipitation cover and used for detecting the concentration of radon;
and a probe of the detector is arranged in the precipitation cover, and the probe and the radon measuring chamber form a collecting electric field.
2. The radon exhalation rate measuring instrument as recited in claim 1, wherein said radon measuring chamber is a housing having a first voltage value, said detector is disposed inside said radon measuring chamber, and said detector has a second voltage value, wherein said first voltage value is a positive voltage value and is greater than said second voltage value.
3. The radon exhalation rate measuring instrument as claimed in claim 2, wherein a plurality of through holes are provided on the housing of the radon measuring chamber.
4. The radon exhalation rate measuring instrument as claimed in claim 2, wherein said exhalation mask is provided as an insulating material.
5. The radon exhalation rate measuring instrument as claimed in claim 2, wherein said exhalation mask is a metallic material and is grounded.
6. The radon exhalation rate measuring instrument as claimed in claim 1, wherein said detector is configured as a negative high voltage detector, said radon measuring chamber is defined inside said exhalation hood, and said exhalation hood housing is made of conductive material and grounded.
7. The radon exhalation rate measuring instrument as claimed in claim 2 or 6, further comprising a protection plate disposed at said opening for isolating said opening from said radon measurement chamber, and a plurality of ventilation holes disposed on said protection plate for keeping said opening and said radon measurement chamber in air communication.
8. The radon exhalation rate measuring instrument as claimed in claim 6, wherein said negative high voltage detector comprises a negative high voltage power supply, a high voltage filter voltage dividing circuit, a charge sensitive amplifier and a probe, said negative high voltage power supply is connected to said high voltage filter voltage dividing circuit, said negative high voltage power supply provides a negative high voltage for said high voltage filter voltage dividing circuit; the probe is electrically connected with the high-voltage filter circuit and is used for loading negative high voltage; the charge sensitive amplifier is electrically connected with the high-voltage filtering and voltage-dividing circuit and is used for amplifying the electric signal detected by the probe.
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CN202110460862.2A CN113238272A (en) | 2021-04-27 | 2021-04-27 | Radon exhalation rate measuring instrument |
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Citations (8)
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