CN109655865A - Po-218, Po-214 tale closed loop measure the device and method of radium concentration in water - Google Patents
Po-218, Po-214 tale closed loop measure the device and method of radium concentration in water Download PDFInfo
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Abstract
Po-218, Po-214 tale closed loop measure the device and method of radium concentration in water, including water sample measurement bottle, bottle cap, air inlet pipe sleeve, outlet pipe sleeve, air inlet pipe, escape pipe, air pump, static collection emanometer, flowmeter, the first three-way magnetic valve and the second three-way magnetic valve；Measuring device is placed in isoperibol, the the second outlet side opening for controlling the first three-way magnetic valve and the second three-way magnetic valve is communicated with atmospheric environment, or the first three-way magnetic valve of control and the first outlet side of the second three-way magnetic valve are unfolded into closed loop gas circuit, air pump control air enters water sample measurement bottle and is bubbled, radon in water sample to be measured is carried out, enter air pump by escape pipe, subsequently into static collection emanometer, enters back into the inlet end of air inlet pipe.It is decayed to count according to environment temperature, the volume of water sample to be measured, the volume of closed loop gas circuit, static collection emanometer and Po-218, Po-214 and calculates radium concentration in water.Apparatus of the present invention structure is simple, easy to operate, and time of measuring is short.
Description
Technical field
The present invention relates to a kind of nuclear radiation detection technology, especially a kind of Po-218, Po-214 tale closed loop measurement
The device and method of radium concentration in water.
Background technique
Radium (Ra-226) is a kind of extremely toxic close bone alpha activity nucleic, its a large amount of deposits in vivo can induce osteocarcinoma
Or leukaemia, to be detrimental to health.Radium (Ra-226) is generally higher in underground water activity, than general surface water (river water,
Lake water, seawater etc.) the high 1-2 order of magnitude of activity；The drinking water source in many areas is underground water, some areas underground in the world
Naturally the radium element containing high concentration or the exploitation with different mineral products such as uranium mine etc. have a large amount of radium element activated in water
Discharge into underground water so that there are biggish security risks when doing drinking water source using underground water by people, thus into
The concentration to the radium element contained in local underground water is needed to carry out long-term monitoring when row drinking water source is chosen.The prior art
The measuring device and measuring method of radium concentration of element are complicated in water and time of measuring is long, need in a kind of achievable rapid survey water
The device and method of radium concentration.
Summary of the invention
A kind of Po-218, Po-214 tale is provided and is closed the purpose of the present invention is overcoming the above-mentioned insufficient of the prior art
Ring type measures the device and method of radium concentration in water, utilizes radium concentration in Po-218, Po-214 tale closed loop measurement water
Device radium concentration in accurate water can quickly be obtained by this method.
The technical scheme is that Po-218, Po-214 tale closed loop measure the device of radium concentration in water, including
Water sample measure bottle, bottle cap, air inlet pipe sleeve, outlet pipe sleeve, air inlet pipe, escape pipe, air pump, static collection emanometer, flowmeter,
First three-way magnetic valve and the second three-way magnetic valve.
Air inlet pipe sleeve and outlet pipe sleeve are separately mounted on bottle cap, and air inlet pipe is inserted in air inlet pipe and puts on, and escape pipe is inserted in out
On air pipe sleeve, escape pipe is connected by the inlet end of hose and air pump, and the outlet side of air pump passes through hose and the first threeway electromagnetism
The inlet end of valve connects, and the first outlet side of the first three-way magnetic valve is connected by the inlet end of hose and static collection emanometer
It connects, the second outlet side of the first three-way magnetic valve is communicated with atmospheric environment, and the outlet side of static collection emanometer passes through hose
It being connect with the inlet end of flowmeter, the outlet side of flowmeter is connect by hose with the inlet end of the second three-way magnetic valve, and second
First outlet side of three-way magnetic valve is connected by hose and the inlet end of air inlet pipe, the second outlet side of the second three-way magnetic valve
It is communicated with atmospheric environment.
The method that radium concentration in Po-218, Po-214 tale closed loop measurement water is carried out using above-mentioned measuring device, packet
Measurement process and calculating process are included, the specific steps of which are as follows:
One, measurement process
A, the device that Po-218, Po-214 tale closed loop measure radium concentration in water is placed on to the environment of constant temperature, and
Measure environment temperature；
B, water sample to be measured is poured into water sample measurement bottle, and covers tightly bottle cap, the gas outlet of air inlet pipe in water sample to be measured simultaneously
Close to the bottom of bottle of water sample measurement bottle, the air inlet of escape pipe is located on water sample liquid level to be measured；
C, the second outlet side of the first three-way magnetic valve, the second three-way magnetic valve is opened respectively, closes the first threeway electromagnetism
First outlet side of valve, the second three-way magnetic valve, booster air pump, the flow rate for controlling air pump keeps it very big, so that air passes through
Air inlet pipe, which enters in water sample to be measured, to be bubbled, while the radon in water sample to be measured being carried out, and is entered air pump by escape pipe and is entered
Then first three-way magnetic valve enters atmospheric environment from the second outlet side of the first three-way magnetic valve, since the flow rate of air pump is non-
Chang great, after air pump starts 5-30 minutes, it can be seen that the concentration of radon is 0 in gas circuit；
D, the second outlet side of the first three-way magnetic valve, the second three-way magnetic valve is closed respectively, opens the first threeway electromagnetism
First outlet side of valve, the second three-way magnetic valve controls air pump tune by obtaining meter readings to form closed loop gas circuit
Small flow rate is bubbled so that air is entered in water sample to be measured by air inlet pipe, while the radon in water sample to be measured being carried out, and passes through
Escape pipe enters air pump and enters the first three-way magnetic valve, then enters electrostatic collection from the first outlet side of the first three-way magnetic valve
After method emanometer, then by flowmeter, the second three-way magnetic valve is entered from the outlet side of flowmeter, then from the second threeway electromagnetism
First outlet side of valve is again introduced into air inlet pipe；When turning air pump flow rate down, the flow rate of air pump keeps moderate, so that electrostatic collection
Method emanometer measures the variation synchronous with the gaseous state radon consistence in water sample measurement bottle of intracavitary radon consistence；
E, it is measured using compared with short cycle of measurement, measurement period T is 2-20 minutes；
Two, calculating process
According to the reading of environment temperature, the volume of water sample to be measured, the volume of closed loop gas circuit and static collection emanometer
Calculate the radium concentration in water sample.
Water sample measures the radon in the water in bottle from the decay of radium in water.If the volume of water sample is V, radium activity is in water
ARa, then radium concentration C in waterRaAre as follows:
CRa=ARa/V (1)
Water sample measures radon consistence C ' in the water in bottleRnChanging rule are as follows:
dC'Rn/ dt=CRaλRn-λRn(C'Rn+CRnV1/V)-λlCRnV1/V (2)
λ in formulaRnIt is the decay coefficient of radon；CRnIt is the concentration of radon in closed loop gas circuit；V1It is the volume of closed loop gas circuit, closed loop gas
The volume on road includes the conduit volume of hose, the conduit volume of air inlet pipe, the conduit volume of escape pipe, static collection emanometer
The sum of the volume of volume and water sample the measurement bottle ullage space of internal measurement chamber；λlIt is leadage coefficient；
Temperature when according to measurement tables look-up to obtain concentration ratio X when water radon and gaseous state radon balance, has:
C'Rn=XCRn (3)
Formula (3) are substituted into formula (2) to obtain:
Enable Effective Decay Constant λeAre as follows:
Formula (4) simplifies are as follows:
Initial radon consistence is 0, the solution of formula (6) are as follows:
Since the flow rate of air pump is moderate, measured it can be seen that static collection emanometer measures intracavitary radon consistence and water sample
The synchronous variation of gaseous state radon consistence in bottle.According to the measuring principle of static collection emanometer, the gas of static collection emanometer
State radon consistence actual measurement is the concentration for measuring intracavitary Po-218, the intracavitary Po-218 concentration of the measurement of static collection emanometer
CPo(t) changing rule are as follows:
Formula (7) are substituted into formula (8) to obtain
The initial concentration of Po-218 is 0, the solution of formula (9) are as follows:
Obtaining measuring in chamber in static collection emanometer according to radon decay chain has:
CPb(t)、CBi(t) be respectively Pb-214, Bi-214 concentration；λPb、λBiIt is the decay of Pb-214, Bi-214 respectively
Constant.
After Bi-214 decay is Po-214, Po-214 half-life period only has 164us, it can be seen that the concentration of Bi-214 is exactly
The concentration of Po-214；That is:
CPo214(t) be Po-214 concentration.
When initial measurement, the concentration of Pb-214, Bi-214, Po-214 are 0, are solved according to formula (11), (13):
Static collection emanometer first carries out under conditions of radon reaches balance with Po-218, Po-214 in Standard Radon Chamber
Measurement calibration in 30-120 minutes, obtains:
C0=k1m1=k2m2 (16)
m1、m2Respectively the unit time of Po-218, Po-214 decay emission high-energyα-particle counts； C0For Standard Radon Chamber
Radon consistence；k1、k2For scale factor.
Since measurement period T is shorter, the average counter rate of each measurement period is the counting rate at the measurement period midpoint.It is right
Have in n-th of measurement period:
m1(n)、m2It (n) is respectively the counting rate of Po-218, Po-214 in n-th of measurement period radioactive decay.By formula
(10), (15) substitute into formula (17), then carry out nonlinear data fitting according to the data of formula (17) to all measurement periods and obtain water
Middle radium concentration.
The invention has the following advantages over the prior art:
1, the apparatus structure of radium concentration is simple in Po-218, Po-214 tale closed loop of the invention measurement water, operation
Convenient, time of measuring is short.
2, radium densimeter in water is calculated by the method that Po-218, Po-214 tale closed loop measures radium concentration in water
Calculation process is simple, and the radium concentration results of acquisition are accurate, can be by continue for a long time to radium concentration in the underground water water sample of somewhere
Property monitoring, analysis formulates the drinking water standard of health for country, and is water pollution control, national disease prevention and treatment, agriculture
Animal husbandry water etc. provides foundation, it is ensured that groundwater environment and Drinking Water for Residents safety.
Detailed construction of the invention is further described below in conjunction with the drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that Po-218, Po-214 tale closed loop of the present invention measures the device of radium concentration in water.
Specific embodiment
As shown in Figure 1, Po-218, Po-214 tale closed loop measure the device of radium concentration in water, including water sample measurement
Bottle 1, bottle cap 2, air inlet pipe sleeve 3, outlet pipe sleeve 4, air inlet pipe 5, escape pipe 6, air pump 7, static collection emanometer 8, flowmeter
9, the first three-way magnetic valve 10 and the second three-way magnetic valve 11.
Air inlet pipe sleeve 3 and outlet pipe sleeve 4 are separately mounted on bottle cap 2, and air inlet pipe 5 is inserted on air inlet pipe sleeve 3, escape pipe 6
It is inserted on outlet pipe sleeve 4, escape pipe 6 is connect by hose with the inlet end of air pump 7, and the outlet side of air pump 7 passes through hose and the
The inlet end of one three-way magnetic valve 10 connects, and the first outlet side of the first three-way magnetic valve 10 is surveyed by hose and static collection
The inlet end of radon instrument 8 connects, and the second outlet side of the first three-way magnetic valve 10 is communicated with atmospheric environment, static collection emanometer
8 outlet side is connect by hose with the inlet end of flowmeter 9, and the outlet side of flowmeter 9 passes through hose and the second threeway electromagnetism
The inlet end of valve 11 connects, and the first outlet side of the second three-way magnetic valve 11 is connect by hose with the inlet end of air inlet pipe 5, the
Second outlet side of two three-way magnetic valves 11 is communicated with atmospheric environment.
The method that radium concentration in Po-218, Po-214 tale closed loop measurement water is carried out using above-mentioned measuring device, packet
Measurement process and calculating process are included, the specific steps of which are as follows:
One, measurement process
A, the device that Po-218, Po-214 tale closed loop measure radium concentration in water is placed on to the environment of constant temperature, and
Measure environment temperature；
B, water sample to be measured is poured into water sample measurement bottle 1, and covers tightly bottle cap 2, the gas outlet of air inlet pipe 5 is in water sample to be measured
And close to the bottom of bottle of water sample measurement bottle 1, the air inlet of escape pipe 6 is located on water sample liquid level to be measured；
C, the second outlet side of the first three-way magnetic valve 10, the second three-way magnetic valve 11 is opened respectively, closes the first threeway
The flow rate of first outlet side of solenoid valve 10, the second three-way magnetic valve 11, booster air pump 7, control air pump 7 keeps it very big, makes
Air is obtained by being bubbled in the entrance of air inlet pipe 5 water sample to be measured, while the radon in water sample to be measured being carried out, passes through escape pipe 6
Enter the first three-way magnetic valve 10 into air pump 7, then enter atmospheric environment from the second outlet side of the first three-way magnetic valve 10,
Since the flow rate of air pump 7 is very big, after air pump 7 starts 5-30 minutes, it can be seen that the concentration of radon is 0 in gas circuit；
D, the second outlet side of the first three-way magnetic valve 10, the second three-way magnetic valve 11 is closed respectively, opens the first threeway
First outlet side of solenoid valve 10, the second three-way magnetic valve 11, to form closed loop gas circuit, by obtain the reading of flowmeter 9 come
Control air pump 7 turns flow rate down, is bubbled so that air is entered in water sample to be measured by air inlet pipe 5, while by the radon in water sample to be measured
It is carried out, the first three-way magnetic valve 10 is entered into air pump by escape pipe 6, then from the first of the first three-way magnetic valve 10
After outlet side enters static collection emanometer 8, then by flowmeter 9, the second threeway electromagnetism is entered from the outlet side of flowmeter 9
Then valve 11 is again introduced into air inlet pipe 5 from the first outlet side of the second three-way magnetic valve 11；When turning 7 flow rate of air pump down, air pump
7 flow rate keeps moderate, so that static collection emanometer 8 measures the gaseous state radon in intracavitary radon consistence and water sample measurement bottle 1
The synchronous variation of concentration；
E, it is measured using short cycle of measurement, measurement period T is 2-20 minutes；
Two, calculating process
According to the reading of environment temperature, the volume of water sample to be measured, the volume of closed loop gas circuit and static collection emanometer 8
Calculate the radium concentration in water sample.
Water sample measures the radon in the water in bottle 1 from the decay of radium in water.If the volume of water sample is V, radium activity in water
For ARa, then radium concentration C in waterRaAre as follows:
CRa=ARa/V (1)
Water sample measures radon consistence C ' in the water in bottle 1RnChanging rule are as follows:
dC'Rn/ dt=CRaλRn-λRn(C'Rn+CRnV1/V)-λlCRnV1/V (2)
λ in formulaRnIt is the decay coefficient of radon；CRnIt is the concentration of radon in closed loop gas circuit；V1It is the volume of closed loop gas circuit, closed loop gas
The volume on road includes the conduit volume of hose, the conduit volume of air inlet pipe 5, the conduit volume of escape pipe 6, static collection survey radon
The sum of the volume of volume and water sample measurement 1 ullage space of bottle of 8 internal measurement chamber of instrument；λlIt is leadage coefficient.
Temperature when according to measurement tables look-up to obtain concentration ratio X when water radon and gaseous state radon balance, has:
C'Rn=XCRn (3)
Formula (3) are substituted into formula (2) to obtain:
Enable Effective Decay Constant λeAre as follows:
Formula (4) simplifies are as follows:
Initial radon consistence is 0, the solution of formula (6) are as follows:
Since the flow rate of air pump 7 is moderate, surveyed it can be seen that static collection emanometer 8 measures intracavitary radon consistence and water sample
The synchronous variation of gaseous state radon consistence in measuring bottle 1.According to the measuring principle of static collection emanometer 8, static collection emanometer 8
Gaseous state radon consistence actual measurement be the concentration for measuring intracavitary Po-218, the intracavitary Po- of the measurement of static collection emanometer 8
218 concentration CsPo(t) changing rule are as follows:
Formula (7) are substituted into formula (8) to obtain
The initial concentration of Po-218 is 0, the solution of formula (9) are as follows:
Obtaining measuring in chamber in static collection emanometer 8 according to radon decay chain has:
CPb(t)、CBi(t) be respectively Pb-214, Bi-214 concentration；λPb、λBiIt is the decay of Pb-214, Bi-214 respectively
Constant.
After Bi-214 decay is Po-214, Po-214 half-life period only has 164us, it can be seen that the concentration of Bi-214 is exactly
The concentration of Po-214；That is:
CPo214(t) be Po-214 concentration.
When initial measurement, the concentration of Pb-214, Bi-214, Po-214 are 0, are solved according to formula (11), (13):
Static collection emanometer 8 first in Standard Radon Chamber under conditions of radon and Po-218, Po-214 reach balance into
Row measurement in 30-120 minutes calibration, obtains:
C0=k1m1=k2m2 (16)
m1、m2Respectively the unit time of Po-218, Po-214 decay emission high-energyα-particle counts； C0For Standard Radon Chamber
Radon consistence；k1、k2For scale factor.
Since measurement period T is shorter, the average counter rate of each measurement period is the counting rate at the measurement period midpoint.It is right
Have in n-th of measurement period:
m1(n)、m2It (n) is respectively the counting rate of Po-218, Po-214 in n-th of measurement period radioactive decay.By formula
(10), (15) substitute into formula (17), then carry out nonlinear data fitting according to the data of formula (17) to all measurement periods and obtain water
Middle radium concentration.
Claims (2)
1.Po-218, Po-214 tale closed loop measure water in radium concentration device, it is characterized in that: include water sample measurement bottle,
Bottle cap, air inlet pipe sleeve, outlet pipe sleeve, air inlet pipe, escape pipe, air pump, static collection emanometer, flowmeter, the one or three are powered
Magnet valve and the second three-way magnetic valve；
Air inlet pipe sleeve and outlet pipe sleeve are separately mounted on bottle cap, and air inlet pipe is inserted in air inlet pipe and puts on, and escape pipe is inserted in escape pipe
It puts on, escape pipe is connected by the inlet end of hose and air pump, and the outlet side of air pump passes through hose and the first three-way magnetic valve
First outlet side of inlet end connection, the first three-way magnetic valve is connect by hose with the inlet end of static collection emanometer,
Second outlet side of the first three-way magnetic valve is communicated with atmospheric environment, and the outlet side of static collection emanometer passes through hose and stream
The inlet end of meter connects, and the outlet side of flowmeter is connect by hose with the inlet end of the second three-way magnetic valve, the second threeway
First outlet side of solenoid valve is connected by the inlet end of hose and air inlet pipe, the second outlet side of the second three-way magnetic valve and big
Compression ring border communicates.
2. carrying out radium concentration in Po-218, Po-214 tale closed loop measurement water using measuring device described in claim 1
Method, characterized in that including measurement process and calculating process, the specific steps of which are as follows:
One, measurement process
A, the device that Po-218, Po-214 tale closed loop measure radium concentration in water is placed on the environment of constant temperature, and measured
Environment temperature；
B, water sample to be measured is poured into water sample measurement bottle, and covers tightly bottle cap, the gas outlet of air inlet pipe is in water sample to be measured and close
Water sample measures the bottom of bottle of bottle, and the air inlet of escape pipe is located on water sample liquid level to be measured；
C, it opens the second outlet side of the first three-way magnetic valve, the second three-way magnetic valve respectively, closes the first three-way magnetic valve, the
First outlet side of two three-way magnetic valves, booster air pump, the flow rate for controlling air pump keeps it very big, so that air passes through air inlet pipe
Into being bubbled in water sample to be measured, while the radon in water sample to be measured being carried out, air pump is entered into the one or three by escape pipe
Then three-way electromagnetic valve enters atmospheric environment from the second outlet side of the first three-way magnetic valve, since the flow rate of air pump is very big, gas
After pump startup 5-30 minutes, it can be seen that the concentration of radon is 0 in gas circuit；
D, it closes the second outlet side of the first three-way magnetic valve, the second three-way magnetic valve respectively, opens the first three-way magnetic valve, the
Stream is turned down to control air pump by obtaining meter readings to form closed loop gas circuit in first outlet side of two three-way magnetic valves
Rate is bubbled so that air is entered in water sample to be measured by air inlet pipe, while the radon in water sample to be measured being carried out, and passes through outlet
Pipe enters air pump and enters the first three-way magnetic valve, then enters static collection from the first outlet side of the first three-way magnetic valve and surveys
After radon instrument, then by flowmeter, the second three-way magnetic valve is entered from the outlet side of flowmeter, then from the second three-way magnetic valve
First outlet side is again introduced into air inlet pipe；When turning air pump flow rate down, the flow rate of air pump keeps moderate, so that static collection is surveyed
Radon instrument measures the variation synchronous with the gaseous state radon consistence in water sample measurement bottle of intracavitary radon consistence；
E, it is measured using short cycle of measurement, measurement period T is 2-20 minutes；
Two, calculating process
It is calculated according to the reading of environment temperature, the volume of water sample to be measured, the volume of closed loop gas circuit and static collection emanometer
Radium concentration in water sample；
Water sample measures the radon in the water in bottle from the decay of radium in water；If the volume of water sample is V, radium activity is A in waterRa,
Then radium concentration C in waterRaAre as follows:
CRa=ARa/V (1)
Water sample measures radon consistence C ' in the water in bottleRnChanging rule are as follows:
dC'Rn/ dt=CRaλRn-λRn(C'Rn+CRnV1/V)-λlCRnV1/V (2)
λ in formulaRnIt is the decay coefficient of radon；CRnIt is the concentration of radon in closed loop gas circuit；V1It is the volume of closed loop gas circuit, closed loop gas circuit
Volume include the conduit volume of hose, the conduit volume of air inlet pipe, the conduit volume of escape pipe, inside static collection emanometer
Measure the volume of chamber and the sum of the volume of water sample measurement bottle ullage space；λlIt is leadage coefficient；
Temperature when according to measurement tables look-up to obtain concentration ratio X when water radon and gaseous state radon balance, has:
C'Rn=XCRn (3)
Formula (3) are substituted into formula (2) to obtain:
Enable Effective Decay Constant λeAre as follows:
Formula (4) simplifies are as follows:
Initial radon consistence is 0, the solution of formula (6) are as follows:
Since the flow rate of air pump is moderate, it can be seen that static collection emanometer measures in intracavitary radon consistence and water sample measurement bottle
The synchronous variation of gaseous state radon consistence；According to the measuring principle of static collection emanometer, the gaseous state radon of static collection emanometer
Concentration actual measurement is the concentration for measuring intracavitary Po-218, the intracavitary Po-218 concentration C of the measurement of static collection emanometerPo
(t) changing rule are as follows:
Formula (7) are substituted into formula (8) to obtain
The initial concentration of Po-218 is 0, the solution of formula (9) are as follows:
Obtaining measuring in chamber in static collection emanometer according to radon decay chain has:
CPb(t)、CBi(t) be respectively Pb-214, Bi-214 concentration；λPb、λBiIt is the decay coefficient of Pb-214, Bi-214 respectively；
After Bi-214 decay is Po-214, Po-214 half-life period only has 164us, it can be seen that the concentration of Bi-214 is exactly Po-214
Concentration；That is:
CPo214(t) be Po-214 concentration；
When initial measurement, the concentration of Pb-214, Bi-214, Po-214 are 0, are solved according to formula (11), (13):
Static collection emanometer first carries out 30- under conditions of radon and Po-218, Po-214 reach balance in Standard Radon Chamber
Measurement calibration in 120 minutes, obtains:
C0=k1m1=k2m2 (16)
m1、m2Respectively the unit time of Po-218, Po-214 decay emission high-energyα-particle counts；C0It is dense for Standard Radon Chamber radon
Degree；k1、k2For scale factor；
Since measurement period T is shorter, the average counter rate of each measurement period is the counting rate at the measurement period midpoint；For
N measurement period has:
m1(n)、m2It (n) is respectively the counting rate of Po-218, Po-214 in n-th of measurement period radioactive decay；By formula (10),
(15) formula (17) are substituted into, then according to formula (17) nonlinear data fitting is carried out to data of all measurement periods to obtain radium in water dense
Degree.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655866A (en) * | 2018-12-21 | 2019-04-19 | 衡阳师范学院 | Closed loop electrostatic collection two-stage method measures the device and method of radium concentration in water |
| CN109655862A (en) * | 2018-12-21 | 2019-04-19 | 衡阳师范学院 | Closed loop static collection partial integration measures the device and method of radium concentration in water |
| CN109655864A (en) * | 2018-12-21 | 2019-04-19 | 衡阳师范学院 | Po-218, Po-214 tale closed loop two-stage method measure the device and method of radium concentration in water |
| CN109655868A (en) * | 2018-12-21 | 2019-04-19 | 衡阳师范学院 | The device and method of radium concentration in closed loop static collection rapid survey water |
| CN109655863A (en) * | 2018-12-21 | 2019-04-19 | 衡阳师范学院 | The square law device and method of radium concentration in two period measurement water of closed loop electrostatic collection |
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| CN109655868B (en) * | 2018-12-21 | 2022-08-02 | 衡阳师范学院 | Method for rapidly measuring radium concentration in water by closed-loop electrostatic collection method |
| CN109655866B (en) * | 2018-12-21 | 2022-08-12 | 衡阳师范学院 | Method for measuring radium concentration in water by closed-loop electrostatic collection two-stage method |
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