CN103616712B - The measuring method of the detection efficiency of Airborne Radioiodine surveying instrument - Google Patents
The measuring method of the detection efficiency of Airborne Radioiodine surveying instrument Download PDFInfo
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- CN103616712B CN103616712B CN201310667210.1A CN201310667210A CN103616712B CN 103616712 B CN103616712 B CN 103616712B CN 201310667210 A CN201310667210 A CN 201310667210A CN 103616712 B CN103616712 B CN 103616712B
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- filter paper
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Abstract
The invention discloses a kind of measuring method of detection efficiency of Airborne Radioiodine surveying instrument, can accurate calibration and the detection efficiency detecting Airborne Radioiodine surveying instrument.Its technical scheme is: adopt radioiodine volume activity to carry out scale with reference to mark and detect with the detection efficiency measuring Airborne Radioiodine surveying instrument.By the generation to gaseous iodine, storage and sampling and the determination to measurement standard, the detection efficiency of Airborne Radioiodine surveying instrument is made to be quantized to weigh.
Description
Technical field
The present invention relates to a kind of instrument measure of effectiveness method, particularly relate to the measuring method of the detection efficiency to Airborne Radioiodine surveying instrument.
Background technology
Nuclear safety is the prerequisite that nuclear industry develops in a healthy way, the safe operation of nuclear reactor is the most important thing guaranteeing nuclear safety, nuclear power station heat island inside and the monitoring of surrounding enviroment fission products, and the radioactivity of recirculated water is monitored, be the ruuning situation on nuclear reactor, one of important evidence assessed is done on the impact of surrounding enviroment and the public.
Iodine-131 nucleic is one of main fission products.The radioactive isotope of iodine has
125i,
129i,
131i, the Airborne Radioiodine in nuclear power station gaseous effluent stream or ambient atmosphere mainly
131i, comprises gaseous state, the iodine of particulate and organic iodine.
The monitoring of Airborne Radioiodine is that nuclear facilities and surrounding enviroment fission products thereof monitor one of indispensable means, is also an important content of radiation environmental monitoring.
In air, the monitoring of radioiodine has two kinds of methods, and one is adopt Airborne Radioiodine surveying instrument to carry out real time on-line monitoring, and two is do spectral measurement with after air sampler sampling to sampling filter paper.
The collector that Airborne Radioiodine surveying instrument filter screen, active carbon filter paper and iodine box (activated-carbon filter box) form carries out continuous acquisition, and semiconductor detector is measured in real time to collector.
Counting rate after instrument deduction background obtains activity measurement value divided by detection efficiency, and obtained the cumulative volume of sampled air by sampling flow and the product of time, activity measurement value and the ratio of sampled air volume are sampled air
131i nucleic volume activity.
Visible, accurate calibration Airborne Radioiodine surveying instrument detection efficiency ensures monitoring result gordian technique accurately.
Summary of the invention
The object of the invention is to solve the problem, provide a kind of measuring method and system of detection efficiency of Airborne Radioiodine surveying instrument, can accurate calibration and the detection efficiency detecting Airborne Radioiodine surveying instrument.
Technical scheme of the present invention is: the measuring method that present invention is disclosed a kind of detection efficiency of Airborne Radioiodine surveying instrument, comprising:
Step 1: carry out gas and carry
131the generation of I and collection;
Step 2: the mensuration of radioactivity;
Step 3: the scale of the detection efficiency of Airborne Radioiodine surveying instrument and detection.
According to an embodiment of the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention, step 1 comprises:
Be NaI's by chemical form in reaction vessel
131i solution and Fe
2(SO
4)
3reaction produces I
2, the iodine distillation that reaction generates forms gaseous state
131i
2, conveying is stored in iodine indoor;
The mode that iodine collector is sampled with simulated atmosphere is gathered from iodine room by recycle design
131i.
According to an embodiment of the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention, in the cavity of iodine room, adopt electric heating temperature control mode, iodine room is connected with inner loop mode with reaction vessel.
According to an embodiment of the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention, iodine collector is combined by filter screen, active carbon filter paper, filter box.
According to an embodiment of the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention, step 2 comprises:
Active carbon filter paper is cut into the circle identical with iodine collector internal diameter, by known specific activity
131i solution quantitative and even to drop on filter paper and dries, and can be obtained the radioactivity in filter paper source by the specific activity of the amount of solution dropped on filter paper and solution;
The activity value in filter paper source is measured with high-purity oleic acid;
In the altitude range of iodine box inner chamber, successively set filter paper source height with a predetermined interval, filter paper is filled down to detector surface with activated charcoal, according to the detection efficiency of gamma ray spectrometer during measurement result acquisition filter paper spacing detector surface differing heights;
By the activity value in filter paper source, gamma ray spectrometer to the detection efficiency in differing heights filter paper source, by covering card analog computation determination high-purity oleic acid in iodine collector
131the detection efficiency of I radioactivity;
To determine that the high-purity oleic acid of detection efficiency measures in iodine collector
131i radioactivity.
According to an embodiment of the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention, step 3 comprises:
Will
131the I radioactivity iodine collector of definite value is arranged on the corresponding position of Airborne Radioiodine surveying instrument and measures, and the instrument counting rate after deduction background and the ratio of radioactivity are detection efficiency.
The present invention contrasts prior art following beneficial effect: the solution of the present invention adopts radioiodine volume activity to carry out scale with reference to mark and detect with the detection efficiency measuring Airborne Radioiodine surveying instrument.By the generation to gaseous iodine, storage and sampling and the determination to measurement standard, the detection efficiency of Airborne Radioiodine surveying instrument is made to be quantized to weigh.
Accompanying drawing explanation
Fig. 1 shows the process flow diagram of the preferred embodiment of the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention.
Fig. 2 shows the schematic diagram of the preferred embodiment of the measuring system of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention.
Fig. 3 shows the structural drawing of iodine of the present invention generation and acquisition subsystem.
Fig. 4 shows the schematic diagram of iodine collector of the present invention.
Fig. 5 shows the structural representation of iodine room of the present invention.
Fig. 6 shows the structural drawing of detection efficiency measurement subsystem of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Fig. 1 shows the flow process of the preferred embodiment of the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention.Refer to Fig. 1, details are as follows for the implementation step of the measuring method of the present embodiment.
Step 1: carry out gas and carry
131the generation of I and collection.
In this step, main implementation process is: be NaI's by chemical form in reaction vessel
131i solution and Fe
2(SO
4)
3reaction produces I
2, the iodine distillation that reaction generates forms gaseous state
131i
2, conveying is stored in iodine indoor; The mode that iodine collector is sampled with simulated atmosphere is gathered from iodine room by recycle design
131i.Iodine collector is combined by filter screen, active carbon filter paper, filter box.And in the cavity of iodine room, adopting electric heating temperature control mode, iodine room is connected with inner loop mode with reaction vessel.
Step 2: the mensuration of radioactivity.
The specific implementation process of this step is: active carbon filter paper is cut into the circle identical with iodine collector internal diameter, by known specific activity
131i solution quantitative and even to drop on filter paper and dries, and can be obtained the radioactivity in filter paper source by the specific activity of the amount of solution dropped on filter paper and solution.The activity value in filter paper source is measured with high-purity oleic acid.In the altitude range of iodine box inner chamber, successively set filter paper source height with a predetermined interval, filter paper is filled down to detector surface with activated charcoal, according to the detection efficiency of gamma ray spectrometer during measurement result acquisition filter paper spacing detector surface differing heights.By the activity value in filter paper source, gamma ray spectrometer to the detection efficiency in differing heights filter paper source, by covering card analog computation determination high-purity oleic acid in iodine collector
131the detection efficiency of I radioactivity.To determine that the high-purity oleic acid of detection efficiency measures in iodine collector
131i radioactivity.
Step 3: the scale of the detection efficiency of Airborne Radioiodine surveying instrument and detection.
In this step, be by
131the I radioactivity iodine collector of definite value is arranged on the corresponding position of Airborne Radioiodine surveying instrument and measures, and the instrument counting rate after deduction background and the ratio of radioactivity are detection efficiency.
Fig. 2 shows the principle of the preferred embodiment of the measuring system of the detection efficiency of Airborne Radioiodine surveying instrument of the present invention.Refer to Fig. 2, the measuring system of the present embodiment comprises iodine and produces and acquisition subsystem 1 and detection efficiency measurement subsystem 2.
The principle of the measuring system of the present embodiment is: with Na
131i solution and and Fe
2(SO
4)
3reaction produces
131i
2, with Fe
2(SO
4)
3reaction produces I
2, distil as inputting reservoir vessel " iodine room " after gaseous state, the mode of sampling with simulated atmosphere with iodine collector, gathers gaseous state and aerosolized from iodine room
131i nucleic, with in high-purity oleic acid Accurate Determining iodine collector
131i nuclide emission activity.
In iodine collector
131i nuclide emission activity through accurate definite value, as scale, the measurement standard detecting Airborne Radioiodine surveying instrument detection efficiency.
As shown in Figure 3, iodine generation and acquisition subsystem 1 comprise reaction vessel 10, iodine room 11 and iodine collector 12 further.Reaction vessel 10 is all connected with iodine room 11 with iodine collector 12.Iodine collector 12 specifically refers to Fig. 4, is combined by filter screen, active carbon filter paper 120 and filter box 121.
The structure of iodine room 11 as shown in Figure 5, is that an inner chamber is in laterally cylindrical shape, volume are (0.5 ~ 1.0) m
3closed container, electric heating temperature control device (temperature control system 114 outside the temperature sensor 110, LED 111, electrical heating wire 112, heat-insulation layer 113 and the cavity that are arranged in cavity as shown in the figure formed) is installed in cavity, DEG C adjustable in (room temperature ~ 80), cavity is that the both sides of plane are provided with view window 115 and thief hatch 116.
Iodine room 11 is connected with inner loop mode with reaction vessel 10, and air pump produces the air-flow of 2l/min flow velocity, is produced by chemical reaction
131i
2send into iodine room 11.The temperature controlled in iodine room 11 is about (60 ~ 70) DEG C, to reduce gaseous state
131i
2sublimate.
Sampling pump is with the sampling flow of (20 ~ 30) l/min, and iodine collector 12 adopts recycle design to gather from iodine room 11
131i, makes the distribution of radioiodine in iodine collector 12 similar to atmospheric environment sampled result.
As shown in Figure 6, detection efficiency measurement subsystem 2 comprises high purity germanium detector 20, prime amplifier 21, Spectroscopy amplifier 22, digitizing gamma ray spectrometer 23, multiple tracks buffer memory and the interface 24 and computing machine 25 that are connected successively further.The input end of high purity germanium detector 20 connects the output terminal of iodine collector 12, and high purity germanium detector 20 is connected with high-voltage power supply 26 with prime amplifier 21.
Active carbon filter paper is cut into the circle identical with iodine collector 12 internal diameter, by known specific activity
131i solution quantitative and even to drop on filter paper and dries, and can be obtained the radioactivity in filter paper source by the specific activity of the amount of solution dropped on filter paper and solution.
The activity in filter paper source is measured with high-purity oleic acid.In the altitude range of iodine box inner chamber, be that interval successively sets filter paper source height with 5mm, filter paper is filled down to detector surface with activated charcoal.By the detection efficiency of gamma ray spectrometer during measurement result acquisition filter paper spacing detector surface differing heights.
By the activity value in filter paper source, gamma ray spectrometer to the detection efficiency in differing heights filter paper source, by covering card analog computation determination high-purity oleic acid in iodine collector
131the detection efficiency of I radioactivity.To determine that the high-purity oleic acid of detection efficiency measures in iodine collector
131i radioactivity.
Will
131the I radioactivity iodine collector of definite value is arranged on the corresponding position of Airborne Radioiodine surveying instrument and measures, and the instrument counting rate after deduction background and the ratio of radioactivity are detection efficiency.
Some technical parameters be applied in the present invention are as follows:
Fe
2(SO
4)
3xH
2o solution: 0.1mol/l, 100ml; NaI solution 0.1mol/l, 10ml
Temperature of reaction: ~ 80 DEG C; Stir or oscillation frequency: 1Hz; Reaction time: 1h; Circulating current between reaction vessel and iodine room: ~ 2l/min.
Under these conditions, I
2generation rate: (70 ~ 85) %.
Iodine room is in laterally cylindrical shape, sealing, inner wall smooth, LED illumination, electrical heating, temperature control: room temperature ~ 80C; There are view window, thief hatch in both sides in plane.
Flow velocity (20 ~ 30) the l/min during sampling of iodine collector.
Above-described embodiment is available to those of ordinary skill in the art to realize and uses of the present invention; those of ordinary skill in the art can be without departing from the present invention in the case of the inventive idea; various modifications or change are made to above-described embodiment; thus protection scope of the present invention not limit by above-described embodiment, and should be the maximum magnitude meeting the inventive features that claims are mentioned.
Claims (5)
1. a measuring method for the detection efficiency of Airborne Radioiodine surveying instrument, comprising:
Step 1: carry out gas and carry
131the generation of I and collection;
Step 2: the mensuration of radioactivity;
Step 3: the scale of the detection efficiency of Airborne Radioiodine surveying instrument and detection;
Wherein step 2 comprises:
Active carbon filter paper is cut into the circle identical with iodine collector internal diameter, by known specific activity
131i solution quantitative and even to drop on filter paper and dries, and can be obtained the radioactivity in filter paper source by the specific activity of the amount of solution dropped on filter paper and solution;
The activity value in filter paper source is measured with high-purity oleic acid;
In the altitude range of iodine box inner chamber, successively set filter paper source height with a predetermined interval, filter paper is filled down to detector surface with activated charcoal, according to the detection efficiency of gamma ray spectrometer during measurement result acquisition filter paper spacing detector surface differing heights;
By the activity value in filter paper source, gamma ray spectrometer to the detection efficiency in differing heights filter paper source, by covering card analog computation determination high-purity oleic acid in iodine collector
131the detection efficiency of I radioactivity; And
To determine that the high-purity oleic acid of detection efficiency measures in iodine collector
131i radioactivity.
2. the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument according to claim 1, it is characterized in that, step 1 comprises:
Be NaI's by chemical form in reaction vessel
131i solution and Fe
2(SO
4)
3reaction produces I
2, the iodine distillation that reaction generates forms gaseous state
131i
2, conveying is stored in iodine indoor;
The mode that iodine collector is sampled with simulated atmosphere is gathered from iodine room by recycle design
131i.
3. the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument according to claim 2, is characterized in that, in the cavity of iodine room, adopt electric heating temperature control mode, iodine room is connected with inner loop mode with reaction vessel.
4. the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument according to claim 2, is characterized in that, iodine collector is combined by filter screen, active carbon filter paper, filter box.
5. the measuring method of the detection efficiency of Airborne Radioiodine surveying instrument according to claim 1, it is characterized in that, step 3 comprises:
Will
131the I radioactivity iodine collector of definite value is arranged on the corresponding position of Airborne Radioiodine surveying instrument and measures, and the instrument counting rate after deduction background and the ratio of radioactivity are detection efficiency.
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| CN201310667210.1A CN103616712B (en) | 2013-12-10 | 2013-12-10 | The measuring method of the detection efficiency of Airborne Radioiodine surveying instrument |
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| CN103616712B true CN103616712B (en) | 2016-04-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300714B (en) * | 2016-04-14 | 2021-08-17 | 中国辐射防护研究院 | Detection efficiency calibration method for radioactive iodine activated carbon sampling filter box |
| CN109814150B (en) * | 2019-01-31 | 2023-02-24 | 上海市计量测试技术研究院 | System and method for measuring time function of output rate of airborne iodine-131 |
| CN110632642A (en) * | 2019-10-29 | 2019-12-31 | 绵阳市维博电子有限责任公司 | Rotary radioactive iodine monitoring system and method |
| CN112558140A (en) * | 2020-12-02 | 2021-03-26 | 中国原子能科学研究院 | Contains an exponential distribution131Preparation method of activated carbon filter box source |
| CN112526579B (en) * | 2020-12-02 | 2022-11-29 | 中国原子能科学研究院 | Method for determining activity and distribution of radioactive iodine-131 in activated carbon filter box |
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