CN109655871B - Electrostatic collection type radon measuring method and device with high detection efficiency and without influence of humidity - Google Patents

Electrostatic collection type radon measuring method and device with high detection efficiency and without influence of humidity Download PDF

Info

Publication number
CN109655871B
CN109655871B CN201910055066.3A CN201910055066A CN109655871B CN 109655871 B CN109655871 B CN 109655871B CN 201910055066 A CN201910055066 A CN 201910055066A CN 109655871 B CN109655871 B CN 109655871B
Authority
CN
China
Prior art keywords
radon
crystal layer
scintillation crystal
detection efficiency
measuring chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910055066.3A
Other languages
Chinese (zh)
Other versions
CN109655871A (en
Inventor
李志强
陈纪友
王文静
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hengyang Normal University
Original Assignee
Hengyang Normal University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hengyang Normal University filed Critical Hengyang Normal University
Priority to CN201910055066.3A priority Critical patent/CN109655871B/en
Publication of CN109655871A publication Critical patent/CN109655871A/en
Application granted granted Critical
Publication of CN109655871B publication Critical patent/CN109655871B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • G01T1/20—Measuring radiation intensity with scintillation detectors
    • G01T1/2006—Measuring radiation intensity with scintillation detectors using a combination of a scintillator and photodetector which measures the means radiation intensity

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Measurement Of Radiation (AREA)

Abstract

The invention discloses a high-detection-efficiency electrostatic collection type radon measuring method and device without being influenced by humidity, relates to the technical field of nuclear radiation detection, and adopts a collection area and depth under normal pressureThe measurement chamber with larger degree ratio is used for electrostatic collection; positively charged by reducing radon decay by reducing the depth of the measurement chamber218Po collection time and reduction of positively charged218Po and negatively charged OH‑The method has the advantages that the detection efficiency is improved by increasing the diameter of the measurement chamber and arranging the scintillation crystal layer on the whole top surface of the measurement chamber, the detection area is increased, meanwhile, the wavelength shift optical fiber is laid on the whole back surface of the scintillation crystal layer to collect the flash of the scintillation crystal layer generated by the impact of α particles, so that the detection sensitivity is improved, the detection efficiency is not changed along with the change of the environmental humidity, compared with the method of adopting low-pressure electrostatic measurement, the method has no special requirement on the sealing performance of the measurement chamber when the measurement is carried out under normal pressure, the design and processing difficulty of the measurement chamber is lower, and the popularization and application are more convenient.

Description

Electrostatic collection type radon measuring method and device with high detection efficiency and without influence of humidity
Technical Field
The invention relates to the technical field of nuclear radiation detection, in particular to a high-detection-efficiency electrostatic collection type radon measuring method and device which are not influenced by humidity.
Background
Accurate and reliable measurement of radon is the basis for any study and application of radon. The deep research on the radon measurement principle and method can provide theoretical basis and technical means for new methods and new technical research in the fields of radon monitoring and protection, tracing application and the like, and has great scientific significance and practical value.
In recent years radon monitoring has expanded to new fields and levels, and new measurement methods and instruments have appeared, which have unique advantages, but also have some defects to be perfected and improved. For example, the influence of temperature and humidity on the detection efficiency of the electrostatic collection radon measuring instrument can be reduced by using a small measuring cavity, but the volume of the measuring cavity of the method is far smaller than that of other instruments, so that the detection sensitivity of the instrument is low, and the statistical fluctuation is large. Chinese patent document CN103116179A discloses a method and device for measuring radon by electrostatic collection method without being affected by environmental temperature and humidity, which adopts a design structure of a low-pressure electrostatic measurement cavity, and although the low-pressure measurement cavity can eliminate the influence of air humidity on the detection efficiency and sensitivity of the radon measuring instrument by electrostatic collection method, it is not necessary to dry the measurement cavity by using a drying tube before measurement so that the air humidity is reduced below a specified threshold (the process generally exceeds 1 hour), thereby improving the measurement efficiency. If the influence of the effect is reduced or compensated by increasing the volume of the measurement cavity, the influence of humidity on the detection efficiency and sensitivity of the electrostatic collection radon measuring instrument can be eliminated only by further reducing the air pressure of the measurement cavity.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electrostatic collection type radon measuring method which is not influenced by humidity, and compared with the existing radon measuring method, the radon measuring method has higher measuring efficiency and higher sensitivity. Based on the radon measuring method, the invention also provides an electrostatic collection type radon measuring device.
In order to solve the technical problem, the invention adopts the following scheme: the electrostatic collection type radon measuring method with high detection efficiency and no influence of humidity adopts a measuring chamber with a larger ratio of collection area to depth to carry out electrostatic collection under normal pressure, and applies negative high voltage of more than 1kv to the measuring chamber; positively charged by reducing radon decay by reducing the depth of the measurement chamber218Po collection time and reduction of positively charged218Po and negatively charged OH-The detection efficiency is improved by increasing the diameter of the measurement chamber and arranging the scintillation crystal layer on the whole top surface of the measurement chamber to increase the detection area, and meanwhile, the wavelength shift optical fiber is laid on the whole back surface of the scintillation crystal layer to collect the flash of the scintillation crystal layer generated by the impact of α particles, so that the detection sensitivity is improved, and the detection efficiency is not changed along with the change of the environmental humidity in the electrostatic collection type radon measurement process.
Wherein, the volume of the measuring chamber adopted in the front is not less than 0.5L, and the depth is not more than 5 cm.
Furthermore, the radon-containing air is led into the measuring chamber through the daughter filter at a certain flow rate by a sampling pump,222first generation daughter generated by Rn decay218Po positive charge and adsorb to scintillation crystal layer under the effect of electrostatic field on, when its daughter further decay, α particle striking scintillation crystal layer production flash of light of production, the flash of light that scintillation crystal layer produced is collected through the wavelength displacement optic fibre that sets up at the scintillation crystal layer back, accomplish photoelectric conversion through photomultiplier or silicon photomultiplier, accomplish the particle energy by electronics readout system again and distinguish and count, obtain α particle count, determine radon concentration according to α particle count and radon concentration's relation at last.
Wherein the scintillation crystal layer is a silver-doped zinc sulfide layer.
Preferably, the measuring chamber used has a volume of 1-2L and a depth of 3.5-4.5 cm.
Based on the same technical concept as the radon measuring method, the invention also provides a high-detection-efficiency electrostatic collection type radon measuring device which is not influenced by humidity, and the device comprises: the measuring chamber is applied with negative high voltage larger than 1kv, the volume of the measuring chamber is not less than 0.5L, the depth of the measuring chamber is not more than 5cm, the whole top of the measuring chamber is provided with a scintillation crystal layer, the back of the scintillation crystal layer is paved with a wavelength displacement optical fiber, the tail end of the wavelength displacement optical fiber is connected to the photomultiplier or the silicon photomultiplier, the photomultiplier or the silicon photomultiplier is connected with the electronic reading system, the measuring chamber is provided with an air inlet and an air outlet, the air inlet is connected with an air inlet pipeline, and the air inlet pipeline is provided with a sampling pump and a daughter filter;
the radon-containing air passes through the daughter filter at a certain flow rate by a sampling pump and then enters the measuring chamber,222first generation daughter generated by Rn decay218The Po with positive charge is adsorbed to the scintillation layer under the action of electrostatic field, and when its daughter is further decayed, the α particles produced are collidedThe scintillation crystal layer is struck to generate flash, the flash generated by the scintillation crystal layer is collected through the wavelength displacement optical fiber, photoelectric conversion is completed through the photomultiplier or the silicon photomultiplier, then particle energy discrimination and counting are completed through the electronics reading system, α particle counting is obtained, and finally radon concentration is determined according to the relation between α particle counting and radon concentration.
The back of the scintillation crystal layer is provided with a bottom plate made of transparent organic glass, the outer side of the bottom plate is provided with a reflective cover plate, the bottom plate is tightly attached to the scintillation crystal layer, the upper surface of the bottom plate and the lower surface of the reflective cover plate are provided with optical fiber positioning grooves, and the wavelength displacement optical fibers are laid between the bottom plate and the reflective cover plate and are fixed in the optical fiber positioning grooves.
Preferably, the measuring chamber has a volume of 1-2L and a depth of 3.5-4.5 cm.
Further, the scintillation crystal layer is a silver-doped zinc sulfide layer.
The working principle of the invention is as follows: the sampling pump makes radon-containing air flow at a certain flow rate (such as Q ═ 3 L.min)-1) Enters the measuring chamber after passing through the high-efficiency filter,222first generation daughter generated by Rn decay218Po with positive charges is adsorbed to the surface of the scintillation crystal layer at the top of the measuring chamber under the action of an electrostatic field, when the daughter of the Po with positive charges is further decayed, the generated high-energy α particles impact the scintillation crystal layer to form flashes, the flashes are collected by a wavelength shifting optical fiber at the back of the scintillation crystal layer and transmitted to a photomultiplier or a silicon photomultiplier for photoelectric conversion, electric signals with corresponding intensity are generated, the electric signals are screened to obtain α particle count, and finally, the radon concentration is determined according to the relation (instant factor) between the α particle count and the radon concentration222The principle formula of Rn concentration is as follows:
Figure BDA0001952148210000041
Figure BDA0001952148210000042
is the radon concentration of the detected environment, delta NPIndicating radon decayFirst generation daughter of variants218Total α particles of 6.00MeV generated by further decay of Po, K is radon measuring scale factor, η in formula (1) represents detection efficiency, V represents measuring chamber volume, first generation daughter of radon decay218The α particles of 6.00MeV produced upon further decay of Po are not detected in their entirety, the detected particles218α particle number Δ N generated by Po decayP(T0)′＝ηVΔNP(T0) The formula (1) can be changed into:
Figure BDA0001952148210000051
the radon concentration of the detected environment can be calculated according to the detected alpha particle count through the formulas (1) and (2).
The invention is based on the radon measurement by α energy spectrum method and electrostatic collection method, the scintillation crystal layer has short light emitting time, high light emitting efficiency, almost 100% of detection efficiency for heavy charged particles and extremely insensitive to gamma rays, so that the invention can be used for measuring α particles218Po collection time and reduction of positively charged particles during collection218Po and negatively charged OH-Ion collision and compound probability have improved detection efficiency greatly, through the means greatly increased detection area that sets up scintillation crystal layer and lay wavelength displacement optic fibre at scintillation crystal layer back at the whole face in measuring chamber top for the statistics fluctuation is little, and detectivity is higher. Compared with the mode of adopting low-pressure electrostatic measurement, the measurement process of the invention is carried out under normal pressure, no special requirement is made on the sealing performance of the measurement chamber, and the design and processing difficulty of the measurement chamber is lower.
Drawings
FIG. 1 is a schematic view of the overall structure of a radon measuring chamber;
FIG. 2 is a schematic view of the overall structure of a scintillation crystal layer and a wavelength-shifting optical fiber arranged on the top of a radon measuring chamber;
FIG. 3 is an exploded view of FIG. 2;
in the figure:
1-measuring chamber 2-sampling pump 3-daughter filter
4-photomultiplier 5-wavelength-shift optical fiber 6-scintillation crystal layer
7-negative plate 8-reflecting cover plate 1 a-air inlet
1 b-exhaust port.
Detailed Description
In order to facilitate a better understanding of the improvements of the present invention over the prior art for those skilled in the art, the present invention is further described below with reference to the accompanying drawings and examples.
It should be noted in advance that the "high detection efficiency" of the present invention is higher than that of the conventional electrostatic collection type radon measurement method, and the radon measurement method related to the present invention (the ratio of the collection area to the depth is larger) is higher than that of the conventional electrostatic collection chamber (the ratio of the collection area to the depth is smaller) in the detection efficiency of the same sensitive volume, so the present invention is called "high detection efficiency electrostatic collection type radon measurement".
Fig. 1-3 show the structure of a radon measuring chamber 1 and a scintillation crystal layer 6 and a wavelength shift fiber 5 arranged on the top of the radon measuring chamber 1 in the electrostatic collection type radon measuring device of the present invention, specifically, a negative high voltage greater than 1kv is applied to the measuring chamber 1, the volume of the measuring chamber 1 is not less than 0.5L (the volume of a conventional electrostatic measuring chamber is mostly 0.5-1L), the depth is not more than 5cm, the scintillation crystal layer 6 is arranged on the whole top of the measuring chamber 1, the wavelength shift fiber 5 is laid on the back of the scintillation crystal layer 6, the end of the wavelength shift fiber 5 is connected to a photomultiplier tube 4 or a silicon photomultiplier (the silicon photomultiplier is not shown in the drawing), the photomultiplier tube 4 or the silicon photomultiplier is connected to an electronic reading system (the electronic reading system is the prior art, but not shown in the drawing), the measuring chamber 1 is provided with an air inlet 1a and an air outlet 1b, the air inlet 1a is connected with an air inlet pipeline, and a sampling pump 2 and a daughter filter 3 are arranged on the air inlet pipeline.
Radon-containing air is made to pass through the daughter filter 3 at a certain flow rate by the sampling pump 2 and then enter the measuring chamber 1,222first generation daughter generated by Rn decay218Po positive charge is adsorbed on scintillation crystal layer 6 under the effect of electrostatic field, when its daughter further decays, α particles that produce strike scintillation crystal layer 6 and produce the flash of light, collect the flash of light that scintillation crystal layer 6 produced through wavelength shift optic fibre 5, accomplish photoelectric conversion through photomultiplier 4 or silicon photomultiplier, accomplish the particle energy by electronics readout system again and distinguish and count, obtain α particle count, determine radon concentration according to the relation of α particle count and radon concentration at last.
222The Rn concentration calculation formula is as follows:
Figure BDA0001952148210000071
Figure BDA0001952148210000072
is the radon concentration of the detected environment, delta NPFirst generation daughter representing radon decay218Total α particles of 6.00MeV generated by further decay of Po, K is radon measuring scale factor, η in formula (1) represents detection efficiency, V represents measuring chamber volume, first generation daughter of radon decay218The α particles of 6.00MeV produced by further decay of Po are not detected in their entirety and the detected particles are218α particle number Δ N generated by Po decayP(T0)′＝ηVΔNP(T0) The formula (1) can be changed into:
Figure BDA0001952148210000073
the radon concentration of the detected environment can be calculated according to the detected alpha particle count through the formulas (1) and (2).
The installation mode of the wavelength shifting optical fiber 5 is as shown in fig. 2 and 3, a bottom plate 7 made of transparent organic glass is arranged on the back of the scintillation crystal layer 6, a reflective cover plate 8 is arranged on the outer side of the bottom plate 7, the bottom plate 7 is tightly attached to the scintillation crystal layer 6, optical fiber positioning grooves are formed in the upper surface of the bottom plate 7 and the lower surface of the reflective cover plate 8, and the wavelength shifting optical fiber 5 is laid between the bottom plate 7 and the reflective cover plate 8 and fixed in the optical fiber positioning grooves. In a preferred embodiment, the scintillation crystal layer 6 is a silver-doped zinc sulfide layer, but of course halide scintillation crystal materials may also be selected.
The electrostatic collection type radon measuring device adopts a measuring chamber with a larger ratio of collection area to depth to perform electrostatic collection under normal pressure, and applies negative high voltage more than 1kv to the measuring chamber; positively charged by reducing radon decay by reducing the depth of the measurement chamber218Po collection time and reduction of positively charged218Po and negatively charged OH-The detection efficiency is improved by increasing the diameter of the measurement chamber and arranging a scintillation crystal layer on the whole top surface of the measurement chamber to increase the detection area, and meanwhile, a wavelength displacement optical fiber is laid on the whole back surface of the scintillation crystal layer to collect the flash of the scintillation crystal layer generated by the impact of α particles, so that the detection sensitivity is improved, the detection efficiency is not changed along with the change of the environmental humidity in the static collection type radon measurement process, compared with a low-pressure static measurement mode, the measurement process is carried out under normal pressure, no special requirement is required on the sealing property of the measurement chamber, and the design and processing difficulty of the measurement chamber is lower.
The measurement effect of the electrostatic collecting radon measuring device of the above-described structure is verified by 3 embodiments as follows.
Example 1:
in the embodiment, the radon measuring chamber 1 has a diameter of 112.5mm and a depth of 50mm, the volume of the measuring chamber 1 is about 0.5L, a scintillation crystal layer 6 is arranged on the whole top of the measuring chamber 1, a wavelength shifting optical fiber 5 is laid on the back of the scintillation crystal layer 6, the tail end of the wavelength shifting optical fiber 5 is connected to a photomultiplier tube 4, and the photomultiplier tube 4 is connected with an electronic reading system, as shown in the attached drawings 1-3. The test conditions were: the test is divided into six groups, all the test groups are carried out under the conditions of normal pressure and 18 ℃, three groups are measured by adopting the device involved in the embodiment, and the other three groups are used as a control group and are measured by adopting a RAD7 radon measuring instrument. When the RAD7 radon measuring instrument is used for measurement, the radon chamber air needs to be dried by a dryer. In the three measurement processes of the device involved in the embodiment, the relative humidity of the air in the radon chamber is respectively controlled to be 0%, 50% and 100%, and the flow rate of the radon-containing air introduced into the measurement chamber 1 is controlled to be 3L/min; in the three measurement processes of the control group, the radon-containing air flow rate introduced into the measurement cavity is controlled at 1L/min according to the equipment requirement. When the relative humidity is 0%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 2%; when the relative humidity is 50%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 2.2%; when the relative humidity is 100%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 2.1%. From the above test results, even if the relative humidity is increased from 0% to 100%, the deviation of the measurement result between the device of the present embodiment and the RAD7 radon meter (the air introduced into the RAD7 radon meter is dried by the dryer) is substantially stabilized at 2.1%, and considering the detection error of the detector and the discrimination and statistical error of the electronic reading system, it can be considered that the detection efficiency of the device of the present embodiment does not change with the change of the environmental humidity during the radon measurement process.
Example 2:
the radon measuring chamber 1 in this embodiment has a diameter of 564mm and a depth of 20mm, the volume of the measuring chamber 1 is about 5L, and other structures of the radon measuring device and the test method and conditions are the same as those of embodiment 1. When the relative humidity is 0%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 1.8%; when the relative humidity is 50%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 1.9%; when the relative humidity is 100%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 1.9%. From the above test results, even if the relative humidity is increased from 0% to 100%, the deviation of the measurement result between the device of the present embodiment and the RAD7 radon meter (the air introduced into the RAD7 radon meter is dried by the dryer) is substantially stabilized at 1.9%, and considering the detection error of the detector and the discrimination and statistical error of the electronic reading system, it can be considered that the detection efficiency of the device of the present embodiment does not change with the change of the environmental humidity during the radon measurement process.
Example 3:
the radon measuring chamber 1 in this embodiment has a diameter of 564mm and a depth of 40mm, the volume of the measuring chamber 1 is about 10L, and other structures of the radon measuring device and the test method and conditions are the same as those of embodiment 1. When the relative humidity is 0%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 2%; when the relative humidity is 50%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 2%; when the relative humidity is 100%, the deviation between the result measured by the device in the embodiment and the result measured by the RAD7 radon measuring instrument is about 2.2%. From the above test results, even if the relative humidity is increased from 0% to 100%, the deviation of the measurement result between the device of the present embodiment and the RAD7 radon meter (the air introduced into the RAD7 radon meter is dried by the dryer) is substantially stabilized at 2.1%, and considering the detection error of the detector and the discrimination and statistical error of the electronic reading system, it can be considered that the detection efficiency of the device of the present embodiment does not change with the change of the environmental humidity during the radon measurement process.
In summary, the invention adopts the measuring chamber with larger diameter-depth ratio for electrostatic collection, and the positively charged radon generated by decay can be reduced by increasing the diameter of the measuring chamber and reducing the depth of the measuring chamber218Po collection time and reduction of positively charged particles during collection218Po and negatively charged OH-Ion collision and compound probability have improved detection efficiency greatly, through the means greatly increased detection area that sets up scintillation crystal layer and lay wavelength displacement optic fibre at scintillation crystal layer back at the whole face in measuring chamber top for the statistics fluctuation is little, and detectivity is higher. Compared with the mode of adopting low-pressure electrostatic measurement, the measurement process of the invention is carried out under normal pressure, no special requirement is made on the sealing performance of the measurement chamber, the design and processing difficulty of the measurement chamber is lower, and the invention is more beneficial to popularization and application.
The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.
Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims (8)

1. The electrostatic collection type radon measuring method with high detection efficiency and without being influenced by humidity is characterized in that: under normal pressure, a measuring chamber with the volume not less than 0.5L and the depth not more than 5cm is adopted for electrostatic collection, and negative high voltage more than 1kv is applied to the measuring chamber; positively charged by reducing radon decay by reducing the depth of the measurement chamber218Po collection time and reduction of positively charged218Po and negatively charged OH-The detection efficiency is improved by increasing the diameter of the measurement chamber and arranging the scintillation crystal layer on the whole top surface of the measurement chamber to increase the detection area, and meanwhile, the wavelength shift optical fiber is laid on the whole back surface of the scintillation crystal layer to collect the flash of the scintillation crystal layer generated by the impact of α particles, so that the detection sensitivity is improved, and the detection efficiency is not changed along with the change of the environmental humidity in the electrostatic collection type radon measurement process.
2. The electrostatic collection radon measuring method with high detection efficiency free from the influence of humidity according to claim 1, wherein: the radon-containing air passes through the daughter filter at a certain flow rate by a sampling pump and then enters the measuring chamber,222first generation daughter generated by Rn decay218Po is positively charged and adsorbed onto the scintillation layer under the action of an electrostatic field, and when its daughter decays further, the α particles produced strike the scintillation layer to produce a flash of light, which is collected by a wavelength-shifting fiber placed on the back of the scintillation layer, through a photoelectric cellAnd a multiplier tube or a silicon photomultiplier completes photoelectric conversion, an electronic reading system completes particle energy discrimination and counting to obtain α particle counts, and finally the radon concentration is determined according to the relationship between the α particle counts and the radon concentration.
3. The electrostatic collection radon measuring method with high detection efficiency free from the influence of humidity according to claim 1 or 2, wherein: the scintillation crystal layer is a silver-doped zinc sulfide layer.
4. The electrostatic collection radon measuring method with high detection efficiency free from the influence of humidity according to claim 1, wherein: the volume of the measuring chamber is 1-2L, and the depth is 3.5-4.5 cm.
5. High detection efficiency static collection formula emanometer device that does not receive humidity influence, its characterized in that includes: the measuring chamber is applied with negative high voltage larger than 1kv, the volume of the measuring chamber is not less than 0.5L, the depth of the measuring chamber is not more than 5cm, the whole top of the measuring chamber is provided with a scintillation crystal layer, the back of the scintillation crystal layer is paved with a wavelength displacement optical fiber, the tail end of the wavelength displacement optical fiber is connected to the photomultiplier or the silicon photomultiplier, the photomultiplier or the silicon photomultiplier is connected with the electronic reading system, the measuring chamber is provided with an air inlet and an air outlet, the air inlet is connected with an air inlet pipeline, and the air inlet pipeline is provided with a sampling pump and a daughter filter;
the radon-containing air passes through the daughter filter at a certain flow rate by a sampling pump and then enters the measuring chamber,222first generation daughter generated by Rn decay218Po positive charge is adsorbed on scintillation crystal layer under the effect of electrostatic field, and when its daughter further decayed, α particle striking scintillation crystal layer that produces produced glistens, the flash of light that scintillation crystal layer produced is collected through wavelength shift optic fibre, accomplish photoelectric conversion through photomultiplier or silicon photomultiplier, accomplish the particle energy by electronics readout system again and distinguish and count, obtain α particle count, according to α at lastThe radon concentration is determined by the relationship between the particle count and the radon concentration.
6. The electrostatic collection radon measuring device with high detection efficiency free from the influence of humidity according to claim 5, wherein: the back on scintillation crystal layer is equipped with the film that transparent organic glass made, the outside of film is equipped with the reflection of light apron, scintillation crystal layer is hugged closely to the film be equipped with the optic fibre constant head tank on the upper surface of film and the lower surface of reflection of light apron, wavelength displacement optic fibre is laid between film and reflection of light apron and is fixed in the optic fibre constant head tank.
7. The electrostatic collection radon measuring device with high detection efficiency free from the influence of humidity according to claim 5, wherein: the measuring chamber has a volume of 1-2L and a depth of 3.5-4.5 cm.
8. The electrostatic collection radon measuring device with high detection efficiency free from the influence of humidity according to claim 5, wherein: the scintillation crystal layer is a silver-doped zinc sulfide layer.
CN201910055066.3A 2019-01-21 2019-01-21 Electrostatic collection type radon measuring method and device with high detection efficiency and without influence of humidity Active CN109655871B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910055066.3A CN109655871B (en) 2019-01-21 2019-01-21 Electrostatic collection type radon measuring method and device with high detection efficiency and without influence of humidity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910055066.3A CN109655871B (en) 2019-01-21 2019-01-21 Electrostatic collection type radon measuring method and device with high detection efficiency and without influence of humidity

Publications (2)

Publication Number Publication Date
CN109655871A CN109655871A (en) 2019-04-19
CN109655871B true CN109655871B (en) 2020-08-11

Family

ID=66120199

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910055066.3A Active CN109655871B (en) 2019-01-21 2019-01-21 Electrostatic collection type radon measuring method and device with high detection efficiency and without influence of humidity

Country Status (1)

Country Link
CN (1) CN109655871B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112230265B (en) * 2020-09-07 2024-04-09 核工业北京化工冶金研究院 Radon measuring chamber
CN114637040B (en) * 2022-03-01 2024-06-18 衡阳师范学院 Rapid value setting method for scintillation chamber radon measuring instrument

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3404301C2 (en) * 1984-02-08 1994-01-20 Kernforschungsz Karlsruhe Passive dosimeter
CN85107800B (en) * 1985-10-23 1988-04-20 成都地质学院 Apparatus and operation for detecting rn and its daughter in the soil
US6346709B1 (en) * 2000-03-01 2002-02-12 The United States Of America As Represented By The Secretary Of The Army Alpha, beta, and gamma monitor for measuring concentrations of ionizing radiation emitters in ambient air or other media
CN102141527B (en) * 2010-12-28 2012-11-14 衡阳师范学院 Method for rapidly measuring radon concentration by zero-order approximation
CN105353397B (en) * 2015-10-15 2018-05-25 中国科学院上海应用物理研究所 A kind of radon and thorium emanation continuous measuring device and method based on static collection
CN106707325B (en) * 2016-12-02 2019-02-01 南华大学 For measuring the method and system of dielectric surface radon release total amount in certain period of time

Also Published As

Publication number Publication date
CN109655871A (en) 2019-04-19

Similar Documents

Publication Publication Date Title
CN109655871B (en) Electrostatic collection type radon measuring method and device with high detection efficiency and without influence of humidity
CN203376483U (en) Fine gamma ray full-spectrum fast radon-measurement apparatus
CN109655874B (en) Radon measuring device and method for scintillation chamber
CN105353397B (en) A kind of radon and thorium emanation continuous measuring device and method based on static collection
CN109581471A (en) A kind of multi-layer combined calorimeter
CN101957328A (en) Method and device for continuously and reliably measuring density of radon in air
US4185199A (en) Method of continuously determining radiation working level exposure
CN109444946A (en) A kind of intelligence radon thorium analyzer
CN104597479A (en) Neutron position detection device
CN106291657A (en) A kind of based on the radiant spectral analysis system closing bundle flash fiber
CN205941332U (en) Water chlorophyll concentration normal position detection device
Azevedo et al. TRITIUM-a real-time tritium monitor system for water quality surveillance
CN109696701B (en) Radon self decay rapid detection device and method based on radon daughter inhibition
CN115453610A (en) Neutron full-section detector and detection method thereof
CN113433581B (en) Low-background alpha and beta ray detection device
JP2013174474A (en) Radiation detector
CN2537986Y (en) Radon-thorium analyzer
CN214845799U (en) Radioactive fission gas detection device
CN113484895B (en) Alpha surface pollution detector and detection method for high radon background
CN109655872B (en) Device and method for rapidly measuring radon
RU30008U1 (en) Neutron detector
RU2377598C2 (en) Scintillation detector
CN211955843U (en) Low background anti-coincidence gas-blocking type proportional counter for measuring alpha and beta surface pollution
CN211741592U (en) Multi-path intelligent radon-thorium analyzer
Azevedo et al. Development of a real-time tritium-in-water monitor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant