CN106932812A - A kind of precession hole drilling type active charcoal bag gamma-ray spectrometry surveys radon method - Google Patents
A kind of precession hole drilling type active charcoal bag gamma-ray spectrometry surveys radon method Download PDFInfo
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- CN106932812A CN106932812A CN201511020303.0A CN201511020303A CN106932812A CN 106932812 A CN106932812 A CN 106932812A CN 201511020303 A CN201511020303 A CN 201511020303A CN 106932812 A CN106932812 A CN 106932812A
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- active charcoal
- charcoal bag
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- gamma
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Classifications
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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
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2294—Sampling soil gases or the like
Abstract
The invention belongs to uranium exploration field, and in particular to a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry surveys radon method.The method of the present invention is comprised the following steps：Customization screw type drill bit, active charcoal bag, Self-enclosing transparent plastic bag and gauze bag, ground gamma spectrometer radon decay daughter region of interest thorium decay daughter region of interest is set, determine that ground gamma spectrometer peels off when radon consistence conversion coefficient, encapsulation active charcoal bag, field data collection, data processing and amendment.The method of the present invention is in air-liquid state or particulate radon in can effectively trapping ground vapour, by measuring radon decay daughter214Bi characteristic energy peak net counting rates, radon consistence is converted into after being corrected treatment, significantly simplify the troublesome operation that conventional activated carbon surveys radon method, significantly reduces survey radon financial cost, effectively increases the reliability for surveying radon data.
Description
Technical field
The invention belongs to uranium exploration technical field, and in particular to a kind of precession hole drilling type active charcoal bag gamma
Power spectrum surveys radon method.
Background technology
Property charcoal to survey radon method be a kind of method of prospecting in uranium exploration field, be that a kind of accumulation absorption type surveys radon side
Method, for drawing-in type instantaneous detecting radon technology, the method is influenceed smaller by radon day change, can be preferably
Indicate URANIUM DEPOSITS IN THE DEPTH information.
Radon Measurement Using Activated is the embedding activated-carbon device in soil, is caught using the strong adsorptivity of activated carbon
Radon gas in collection ground vapour, by the method for gamma-spectrometry measurement device Soil-crop system.Traditional activated carbon is surveyed
Radon method exists following not enough：First, activated carbon measuring instrument pig screening arrangement is heavy, not side is carried
Just；Second, being limited by pig, Activated Carbon Instrument for testing Radon device probe crystal volume is too small, actual-structure measurement
Fluctuation is larger, increased statistic fluctuation error；Third, dress activated carbon plastic bottle to fill charcoal amount few, install
In plastic bottle after activated carbon activated carbon thickness reach 3.5cm, it is embedding after bottom of bottle absorption radon gas amount it is obvious
More than the radon gas amount adsorbed near bottleneck, while activated carbon absorbs gamma rays in itself, actual measurement is bottle
Bottom is inwardly near probe measurement, and the error for so causing is larger；Fourth, relatively time-consuming using manually digging pit
Arduously, that and often cheats is deep mixed；Second, activated carbon capturing device it is excessively cumbersome, it is necessary to drier,
Silk floss, plastic bottle, cup etc., carry and assembling is inconvenient.
In sum, uranium exploration field need badly development it is more convenient, more accurately activated carbon e measurement technology grind
Hair.
The content of the invention
The technical problem to be solved in the invention is：A kind of precession hole drilling type active charcoal bag gamma-ray spectrometry is provided
Radon method is surveyed, the method conveniently can accurately carry out activated carbon and survey in radon, effectively extraction ground vapour222Rn。
Technical scheme is as described below：
A kind of precession hole drilling type active charcoal bag gamma-ray spectrometry surveys radon method, comprises the following steps：
Step 1
Screw type drill bit needed for customization drilling；
Step 2
Customization active charcoal bag, is carried out in the center of active charcoal bag upper surface or the center of lower surface
Mark；
Step 3
Customization gauze bag and Self-enclosing transparent plastic bag；
Step 4
Selection ground gamma spectrometer, it is desirable to which ground gamma spectrometer road location is more than 256 roads；Probe crystal
Can be BGO crystal or NaI crystal, BGO crystal probe volume requirements are in 100cm3More than, NaI
Crystal probe volume requirement is in 300cm3More than；
Step 5
Ground gamma spectrometer selected by step 4 is set214Bi region of interest,39K region of interest and208Tl
Region of interest；
Step 6
The ground gamma spectrometer that step 5 sets is demarcated, determines that instrument peels off when radon consistence
Conversion coefficient；
Step 7
Activated carbon is placed in the removal of impurity is gone in baking box, the baked activated carbon for weighing equal quality after cooling
Respectively loaded on the interior simultaneously package of active charcoal bag described in each step 2；
Step 8
Field condition positions measuring point, mark point wire size；
Step 9
Guard station sets the relatively low workplace of uranium, thorium, a potassium background value in the wild, shuts door and window；One
The groove consistent with active charcoal bag dimensions is dug out at the center of block cystosepiment, and cystosepiment is fixed on into work
Between on ground；The active charcoal bag that step 7 installs activated carbon is lain in groove, activated carbon is surrounded by mark
The one of note faces up；The mark position of ground gamma spectrometer alignment probe active charcoal bag is placed, measurement
Active charcoal bag workplace background values；
Step 10
Field condition finds measuring point described in step 8, records the point wire size and embedding date-time t of the measuring point1
Gauze bag in rear enclosure；Punched in measuring point using screw type drill bit, it is after having openning hole that active charcoal bag is markd
One faces down lies in bottom hole, and covers active charcoal bag using plastic sheeting, on the plastic sheeting for covering again
A little soil isolation overhead gas are put, while being covered with plastic sheeting again in earth's surface aperture, aperture is slightly above periphery；
Step 11
The embedding active charcoal bag of step 10 is taken out behind embedding some days, it is then quick to load the transparent modeling of Self-enclosing
Pocket is simultaneously sealed, and records active charcoal bag take-off time t2；
Step 12
The active charcoal bag that step 11 is taken out is taken back into workplace described in step 9, active charcoal bag is markd
One faces up is placed in the groove of cystosepiment plate, by bottom surface gamma spectrometer center probe alignment active charcoal bag
Mark position place, measurement214The net counting rate of Bi region of interest, and record time when starting measurement
t3；
Step 13
Step 12 is measured214The net counting rate of Bi region of interest subtracts the active charcoal bag of step 9 measurement
Workplace background is worth to measuring point radon counting rate Np；
Step 14
The measuring point radon counting rate N that step 13 is obtainedpDivided byIt is modified,
Revised counting rate N is obtained, wherein, λRnIt is radon decay coefficient；
Step 15
Revised counting rate N is multiplied by the radon consistence conversion coefficient that step 6 is demarcated, radon consistence is obtained.
Preferably：In step 1, drill bit diameter of inner pipe 2cm, the 60cm~80cm long are adopted
Use steel material；Screw blade, piece 8cm~10cm wide, using manganese steel material are inlayed outside inner tube；
Drill bit inner tube end perforations diameter 3mm；The steel T-shaped being connected with drill bit has also been customized in step 1
Handle, handle 50cm long, intermediate bar 10cm~40cm long, diameter 1.9cm；T-shaped handle and brill
Connected using threaded connection or using perforation between head；The perforation connection, refer in drill bit inner tube and
T-shaped handle intermediate bar perforation, both penetration hole diameters are identical, diameter 3mm~4mm, handle intermediate bar
A hole can be worn per 10cm, it is separately secondary with diameter 3.7mm~threaded pegs of 3.9mm and supporting nut one,
By pipe end in peg and the T-shaped handle intermediate bar of perforation connection and drill bit.
Preferably：In step 2, the sindon for selecting good permeability and being difficult clay makes work
Property charcoal bag；Active charcoal bag volume specification requirement thickness is 1cm, and capacity is 50cm3~150cm3, shape
For the cylinder or polygon cylinder of 50g~100g activated carbon granules can be filled.
Preferably：In step 5,214Bi region of interest energy range is 1659keV~1860keV,
Correspondence road location scope is 553CH~620CH；208Tl region of interest energy range be 2409keV~
2808keV, correspondence road location scope is 803CH~936CH；39K region of interest energy ranges are
1368keV~1569keV, correspondence road location scope is 456CH~523CH.
Preferably：In step 7, removed using the method baked 4~8 hours in 200 DEG C of baking boxs
The impurity of charcoal absorption；Often the quality of bag activated carbon is equal, is 50g~100g.
Preferably：In step 9, the length of cystosepiment is more than or equal to 15cm, and width is more than or equal to
15cm, thickness is more than or equal to 1.5cm.
Preferably：In step 10, punching depth is 0~80cm.
Preferably：The embedding activated carbon of step 10 is taken out in step 11, after embedding 2~10 days
Bag.
Preferably：In step 12, measurement is twice214The net counting rate of Bi region of interest, measurement
Result takes the average value for measuring twice.
Beneficial effects of the present invention are：
A kind of precession hole drilling type active charcoal bag gamma-ray spectrometry of the invention surveys radon method, drilled using screw type,
The measurement apparatus of active charcoal bag, Portable gamma spectrometer composition, can effectively trap in ground vapour in air-liquid
State or particulate radon, by measuring radon decay daughter214Bi characteristic energy peak net counting rates, are corrected treatment
After be converted into radon consistence, significantly simplify conventional activated carbon survey radon method troublesome operation, significantly reduce
Radon financial cost is surveyed, the reliability for surveying radon data is effectively increased.
Brief description of the drawings
Fig. 1 is that existing Radon Measurement Using Activated and precession hole drilling type active charcoal bag gamma-ray spectrometry of the invention survey radon
The radon consistence curve comparison figure that method is obtained.
Specific embodiment
Radon method is surveyed to a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry of the invention with reference to embodiment
It is described in detail.
A kind of precession hole drilling type active charcoal bag gamma-ray spectrometry of the invention surveys radon method, comprises the following steps：
Step 1
Screw type drill bit needed for customization drilling.
In the present embodiment, the drill bit diameter of inner pipe 2cm, 60cm~80cm long, using steel material；
Screw blade, piece 8cm~10cm wide, using manganese steel material are inlayed outside inner tube；Pipe end in drill bit
Penetration hole diameter 3mm.
In addition, customizing the steel T-shaped handle being connected with drill bit, handle 50cm long, intermediate bar is long
10cm~40cm, diameter 1.9cm.
Connected using threaded connection or using perforation between T-shaped handle and drill bit.The perforation connection,
Refer to that, in drill bit inner tube and T-shaped handle intermediate bar perforation, both penetration hole diameters are identical, diameter 3mm~
4mm, handle intermediate bar can wear a hole per 10cm, separately match somebody with somebody diameter 3.7mm~threaded pegs of 3.9mm
And the supporting pair of nut one, by pipe end in peg and the T-shaped handle intermediate bar of perforation connection and drill bit.
Step 2
Customization active charcoal bag, the sindon for selecting good permeability and being difficult clay makes active charcoal bag.
In the present embodiment, active charcoal bag volume specification requirement thickness is 1cm, and capacity is 50cm3~150cm3,
It is shaped as filling the cylinder or polygon cylinder of 50g~100g activated carbon granules, and in active charcoal bag
The center of end face or the center of lower surface are marked.
In the present embodiment, the active charcoal bag is the cuboid of the generous 9cm × 7cm × 1cm of length.
Step 3
Customization gauze bag and Self-enclosing transparent plastic bag, gauze bag and Self-enclosing transparent plastic bag specification are bigger
In active charcoal bag described in step 2.Gauze bag is in embedding fashionable dress active charcoal bag, it is to avoid active charcoal bag is by soil
Deng Substances Pollution.Active charcoal bag of the Self-enclosing transparent plastic bag for collection sealing after embedding.
Step 4
Selection ground gamma spectrometer, it is desirable to which ground gamma spectrometer road location is more than 256 roads；Probe crystal
Can be BGO crystal or NaI crystal, BGO crystal probe volume requirements are in 100cm3More than, NaI
Crystal probe volume requirement is in 300cm3More than；Ground gamma spectrometer is needed with natural peak automatic steady
Compose, can automatically read and store full modal data, composing the functions such as region of interest data, date-time entirely.
In the present embodiment, the portable bottom surface ray spectrometric survey instrument of RS230 types is selected, the instrument road location is
1024 roads, probe crystal is BGO crystal, crystal volume 103.24cm3, with natural peak automatic steady
Compose, can automatically read and store full modal data, composing the functions such as region of interest data, date-time entirely.
Step 5
Ground gamma spectrometer region of interest is set, ground gamma spectrometer selected by step 4 is set214Bi
Region of interest,39K region of interest and208Tl region of interest.
In the present embodiment,214Bi (characteristic energy peak is 1.76MeV) region of interest energy range is
1659keV~1860keV, correspondence road location scope is 553CH~620CH；208(characteristic energy peak is Tl
2.62MeV) region of interest energy range is 2409keV~2808keV, and correspondence road location scope is
803CH~936CH；39K (characteristic energy peak is 1.46MeV) region of interest energy range is
1368keV~1569keV, correspondence road location scope is 456CH~523CH.
Step 6
The ground gamma spectrometer that step 5 sets is demarcated using master pattern and small-sized radon chamber,
Determine that instrument peels off when radon consistence conversion coefficient.
Step 7
Activated carbon is placed in the removal of impurity is gone in baking box, the baked activated carbon for weighing equal quality after cooling
Respectively loaded on the interior simultaneously package of active charcoal bag described in each step 2.
In the present embodiment, charcoal absorption is removed using the method baked 4~8 hours in 200 DEG C of baking boxs
Impurity.
In the present embodiment, often the quality of bag activated carbon is equal, is 50g~100g.
Step 8
Field condition positions measuring point, is positioned and is done by the latitude and longitude coordinates of design point using GPS and indicates, marks
Note point wire size.
Step 9
Guard station sets the relatively low workplace of uranium, thorium, a potassium background value in the wild, shuts door and window；One
The groove consistent with active charcoal bag dimensions is dug out at the center of block cystosepiment, and cystosepiment is fixed on into work
Between on ground；The active charcoal bag that step 7 installs activated carbon is lain in groove, activated carbon is surrounded by mark
The one of note faces up；The mark position of ground gamma spectrometer alignment probe active charcoal bag is placed, measurement
Active charcoal bag workplace background values.
In the present embodiment, the length of the cystosepiment is more than or equal to 15cm, and width is more than or equal to 15cm,
Thickness is more than or equal to 1.5cm.
Step 10
Field condition finds measuring point described in step 8, does not have markd one side to record the measuring point in active charcoal bag
Point wire size and embedding date-time t1Gauze bag in rear enclosure；Punched in measuring point using screw type drill bit, beaten
Active charcoal bag markd one is faced down behind good hole lies in bottom hole, and activity is covered using plastic sheeting
Charcoal bag, puts a little soil isolation overhead gas, while using plastics again in earth's surface aperture again on the plastic sheeting for covering
Film is covered, and aperture is slightly above periphery, is penetrated into air-isolation and rainwater.
Determined according to the requirement of work area geological environment in the punching depth that measuring point punches using screw type drill bit, this
Depth of being punched in embodiment is 0~80cm.
Step 11
The embedding active charcoal bag of step 10 is taken out after embedding 2~10 days, then quick loading Self-enclosing is transparent
Polybag is simultaneously sealed, and take-off time t is recorded in Self-enclosing transparent plastic bag2。
Step 12
The active charcoal bag that step 11 is taken out is taken back into workplace described in step 9, active charcoal bag is markd
One faces up is placed in the groove of cystosepiment plate, by bottom surface gamma spectrometer center probe alignment active charcoal bag
Mark position place, measurement214The net counting rate of Bi region of interest, and record time when starting measurement
t3。
Measured in the present embodiment, in step 12 twice, measurement result takes the average value for measuring twice.
Step 13
Step 12 is measured214The net counting rate of Bi region of interest subtracts the active charcoal bag of step 9 measurement
Workplace background is worth to measuring point radon counting rate Np。
Step 14
The measuring point radon counting rate N that step 13 is obtainedpDivided byIt is modified,
Revised radon counting rate N is obtained, wherein, λRnIt is radon decay coefficient.
Step 15
Revised counting rate N is multiplied by the radon consistence conversion coefficient that step 6 is demarcated, radon consistence is obtained.
Above description has been described in detail to the present invention in conjunction with the embodiments, but the present invention is not limited to
Embodiment is stated, in the ken that those of ordinary skill in the art possess, this can also not departed from
Made a variety of changes on the premise of invention objective.The content not being described in detail in the present invention can be used
Prior art is realized.
Claims (9)
1. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry surveys radon method, it is characterised in that：Including following
Step：
Step 1
Screw type drill bit needed for customization drilling；
Step 2
Customization active charcoal bag, is carried out in the center of active charcoal bag upper surface or the center of lower surface
Mark；
Step 3
Customization gauze bag and Self-enclosing transparent plastic bag；
Step 4
Selection ground gamma spectrometer, it is desirable to which ground gamma spectrometer road location is more than 256 roads；Probe crystal
Can be BGO crystal or NaI crystal, BGO crystal probe volume requirements are in 100cm3More than, NaI
Crystal probe volume requirement is in 300cm3More than；
Step 5
Ground gamma spectrometer selected by step 4 is set214Bi region of interest,39K region of interest and208Tl
Region of interest；
Step 6
The ground gamma spectrometer that step 5 sets is demarcated, determines that instrument peels off when radon consistence
Conversion coefficient；
Step 7
Activated carbon is placed in the removal of impurity is gone in baking box, the baked activated carbon for weighing equal quality after cooling
Respectively loaded on the interior simultaneously package of active charcoal bag described in each step 2；
Step 8
Field condition positions measuring point, mark point wire size；
Step 9
Guard station sets the relatively low workplace of uranium, thorium, a potassium background value in the wild, shuts door and window；One
The groove consistent with active charcoal bag dimensions is dug out at the center of block cystosepiment, and cystosepiment is fixed on into work
Between on ground；The active charcoal bag that step 7 installs activated carbon is lain in groove, activated carbon is surrounded by mark
The one of note faces up；The mark position of ground gamma spectrometer alignment probe active charcoal bag is placed, measurement
Active charcoal bag workplace background values；
Step 10
Field condition finds measuring point described in step 8, records the point wire size and embedding date-time t of the measuring point1
Gauze bag in rear enclosure；Punched in measuring point using screw type drill bit, it is after having openning hole that active charcoal bag is markd
One faces down lies in bottom hole, and covers active charcoal bag using plastic sheeting, on the plastic sheeting for covering again
A little soil isolation overhead gas are put, while being covered with plastic sheeting again in earth's surface aperture, aperture is slightly above periphery；
Step 11
The embedding active charcoal bag of step 10 is taken out behind embedding some days, it is then quick to load the transparent modeling of Self-enclosing
Pocket is simultaneously sealed, and records active charcoal bag take-off time t2；
Step 12
The active charcoal bag that step 11 is taken out is taken back into workplace described in step 9, active charcoal bag is markd
One faces up is placed in the groove of cystosepiment plate, by bottom surface gamma spectrometer center probe alignment active charcoal bag
Mark position place, measurement214The net counting rate of Bi region of interest, and record time when starting measurement
t3；
Step 13
Step 12 is measured214The net counting rate of Bi region of interest subtracts the active charcoal bag of step 9 measurement
Workplace background is worth to measuring point radon counting rate Np；
Step 14
The measuring point radon counting rate N that step 13 is obtainedpDivided byIt is modified,
Revised counting rate N is obtained, wherein, λRnIt is radon decay coefficient；
Step 15
Revised counting rate N is multiplied by the radon consistence conversion coefficient that step 6 is demarcated, radon consistence is obtained.
2. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry according to claim 1 surveys radon method,
It is characterized in that：
In step 1, the drill bit diameter of inner pipe 2cm, 60cm~80cm long, using steel material；It is interior
The outer edge screw blade of pipe, piece 8cm~10cm wide, using manganese steel material；Pipe end is worn in drill bit
Bore dia 3mm；
The steel T-shaped handle being connected with drill bit is also customized in step 1, handle 50cm long is middle
Bar 10cm~40cm long, diameter 1.9cm；
Connected using threaded connection or using perforation between T-shaped handle and drill bit；The perforation connection,
Refer to that, in drill bit inner tube and T-shaped handle intermediate bar perforation, both penetration hole diameters are identical, diameter 3mm~
4mm, handle intermediate bar can wear a hole per 10cm, separately match somebody with somebody diameter 3.7mm~threaded pegs of 3.9mm
And the supporting pair of nut one, by pipe end in peg and the T-shaped handle intermediate bar of perforation connection and drill bit.
3. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry according to claim 1 surveys radon method,
It is characterized in that：In step 2, the sindon for selecting good permeability and being difficult clay makes active charcoal bag；
Active charcoal bag volume specification requirement thickness is 1cm, and capacity is 50cm3~150cm3, it is shaped to dress
The cylinder or polygon cylinder of 50g~100g activated carbon granules.
4. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry according to claim 1 surveys radon method,
It is characterized in that：In step 5,214Bi region of interest energy range is 1659keV~1860keV, right
Ying Dao locations scope is 553CH~620CH；208Tl region of interest energy range be 2409keV~
2808keV, correspondence road location scope is 803CH~936CH；39K region of interest energy ranges are
1368keV~1569keV, correspondence road location scope is 456CH~523CH.
5. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry according to claim 1 surveys radon method,
It is characterized in that：In step 7, activated carbon is removed using the method baked 4~8 hours in 200 DEG C of baking boxs
The impurity of absorption；Often the quality of bag activated carbon is equal, is 50g~100g.
6. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry according to claim 1 surveys radon method,
It is characterized in that：In step 9, the length of cystosepiment is more than or equal to 15cm, and width is more than or equal to 15cm,
Thickness is more than or equal to 1.5cm.
7. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry according to claim 1 surveys radon method,
It is characterized in that：In step 10, punching depth is 0~80cm.
8. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry according to claim 1 surveys radon method,
It is characterized in that：The embedding active charcoal bag of step 10 is taken out in step 11, after embedding 2~10 days.
9. a kind of precession hole drilling type active charcoal bag gamma-ray spectrometry according to claim 1 surveys radon method,
It is characterized in that：In step 12, measurement is twice214The net counting rate of Bi region of interest, measurement result takes
The average value for measuring twice.
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Cited By (4)
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| CN107632137A (en) * | 2017-08-25 | 2018-01-26 | 核工业北京地质研究院 | Anomaly recognition transient measurement data correcting method in a kind of uranium exploration |
| CN109901211A (en) * | 2017-12-07 | 2019-06-18 | 核工业北京地质研究院 | A kind of fine gamma based on lanthanum bromide crystal is composed entirely surveys radon method |
| CN111562147A (en) * | 2018-04-12 | 2020-08-21 | 福建拓普检测技术有限公司 | Soil radon concentration detection device capable of improving detection accuracy |
| CN112379451A (en) * | 2020-10-30 | 2021-02-19 | 核工业北京地质研究院 | Method for measuring radon gas adsorption of activated carbon bag |
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