CN206788380U - A kind of lead screen measuring chamber suitable for NaI probes - Google Patents
A kind of lead screen measuring chamber suitable for NaI probes Download PDFInfo
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- CN206788380U CN206788380U CN201720624114.2U CN201720624114U CN206788380U CN 206788380 U CN206788380 U CN 206788380U CN 201720624114 U CN201720624114 U CN 201720624114U CN 206788380 U CN206788380 U CN 206788380U
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Abstract
It the utility model is related to a kind of lead screen measuring chamber suitable for NaI probes, including the lead screen room being arranged in measurement chamber enclosure, one end of the lead screen room is connected with screening cover, NaI probe chambers and the measurement chamber for placing iodine sampling charcoal box are provided with lead screen room, the measurement chamber is close to screening cover one end, shielding bonnet is provided with the rear portion of NaI probe chambers, shields and is provided with the compact heap for being used for compressing NaI probes between bonnet and NaI probe chambers.The measuring chamber can fully meet size, the shielding requirements of selected NaI probes, have the characteristics that small volume, shield thickness, easy for installation, stability is good, ensure that the performance test of iodine adsorber is smoothed out.
Description
Technical field
It the utility model is related to nuclear facilities field air cleaning system measurement apparatus, and in particular to one kind is applied to NaI and visited
The lead screen measuring chamber of head.
Background technology
In order to ensure the safe operation of the nuclear facilities such as military project, nuclear industry, nuclear power station, research reactor, reprocessing plant and checking factory
Whether room has radio active gas contamination, prevents the gaseous state radioactive substances such as radioiodide from entering ambient atmosphere and ensure to enter
Factory building worker safety, multiple core purification of air air supplying and exhausting systems are set up in nuclear facilities factory building.These systems are that core is set
Apply and prevent radioaerosol and radioiodine to enter the last barrier of ambient atmosphere under normal operation and accident condition, ensure it
In good state and ensure personnel region surrounding air be totally reduce radioactive substance release source item and
Ensure the important step of personal security.
To ensure the reliability service of core air cleaning system, it is necessary to carry out the debugging test of iodine adsorber and periodically scene examination
Test whether to evaluate iodine adsorber in the normal condition for meeting design requirement.
Iodine adsorber performance test generally purifies according to standard EJ/T 1183-2005 core air cleaning systems iodine adsorber
The measure of coefficient-Radioactive methyl-iodide method is carried out, will131A certain amount of methyl iodide gas of I marks is injected into iodine adsorber upstream
In ventilating system, while sample is gathered in the upstream and downstream of iodine adsorber respectively with sampling apparatus.After sampling terminates, gamma ray spectrometer is used
The radioactive activity of each efficiently filter membrane and iodine sampling charcoal box is measured respectively, by comparing the total activity of upstream and downstream sample, tries to achieve iodine
The coefficient of purification of absorber (row).
Gamma ray spectrometer is the adaptability pair of one of key equipment of iodine adsorber performance test, its stability and scene
The experiment of nuclear facilities iodine adsorber field performance plays an important role.
Utility model content
The purpose of this utility model essentially consists in be tried for China nuclear facilities field air cleaning system iodine adsorber performance
The measurement demand of iodine sampling charcoal box radioactive activity when testing, there is provided a kind of lead screen measuring chamber suitable for NaI probes, ensure iodine
Absorber performance test is smoothed out.
The technical solution of the utility model is as follows：A kind of lead screen measuring chamber suitable for NaI probes, including it is arranged on survey
The lead screen room in chamber enclosure is measured, one end of the lead screen room is connected with screening cover, and NaI is provided with lead screen room and is visited
Head chamber and the measurement chamber for placing iodine sampling charcoal box, the measurement chamber is close to screening cover one end, after NaI pops one's head in chamber
Portion is provided with shielding bonnet, shields and is provided with the compact heap for being used for compressing NaI probes between bonnet and NaI probe chambers.
Further, as described above suitable for the lead screen measuring chamber of NaI probes, wherein, it is provided with the measurement intracavitary
One layer of stainless steel cladding, for realizing that testing sample is isolated with what NaI popped one's head in.
Further, as described above suitable for the lead screen measuring chamber of NaI probes, wherein, described shielding bonnet shares
Two, in nested structure, the labyrinth structure for drawing NaI probe datas line and power line is formed between two shielding bonnets.
Described two shielding bonnets use the integrated poured shaping of Low background lead.It is bolted, shields between two shielding bonnets
It is bolted between bonnet and lead screen room.
Further, as described above suitable for the lead screen measuring chamber of NaI probes, wherein, the screening cover passes through hinge
It is connected with measurement chamber enclosure；Screening cover inner materials are lead, and shell is mild steel spray painting material.
Further, as described above suitable for the lead screen measuring chamber of NaI probes, wherein, the compact heap is scalable
The cylindrical annular structure of deformation, intermediate annular cavity are used for the data wire and power line for drawing NaI probes.Compact heap is high-elastic rubber
Glue material matter.
Further, as described above suitable for the lead screen measuring chamber of NaI probes, wherein, set in measuring chamber shell upper
There are the suspension ring carried for measuring chamber integral hoisting.
Further, as described above suitable for the lead screen measuring chamber of NaI probes, wherein, set in measuring chamber outer casing underpart
There is measuring chamber fixed mount.
The beneficial effects of the utility model are as follows：The utility model is adopted for iodine used in nuclear facilities iodine adsorber performance test
The characteristics of sample charcoal box, a kind of lead screen measuring chamber suitable for NaI probes is devised, the measuring chamber can fully meet selected
NaI probe size, shielding requirements, have the characteristics that small volume, shielding thickness, easy for installation, stability is good, ensure that iodine suction
The performance test of adnexa is smoothed out.
Brief description of the drawings
Fig. 1 is the lead screen measuring chamber internal structure schematic diagram for being applied to NaI probes in the utility model specific embodiment；
Fig. 2 is the lead screen measuring chamber external structure schematic diagram for being applied to NaI probes in the utility model specific embodiment.
In figure, 1- measurement chamber enclosures, 2- suspension ring, 3- compact heaps, 4-NaI probe chambers, 5- screening covers, 6- measurement chambers, 7-
Stainless steel cladding, 8- lead screens room, 9- shielding bonnets I, 10- labyrinths, 11- shielding bonnets II, 12- bolts, 13- measuring chambers are fixed
Frame, 14- hinges
Embodiment
The utility model is described in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the lead screen measuring chamber provided by the utility model suitable for NaI probes, including it is arranged on survey
The lead screen room 8 in chamber enclosure 1 is measured, one end of the lead screen room 8 is connected with screening cover 5, is provided with lead screen room 8
NaI probe chambers 4 and the measurement chamber 6 for placing iodine sampling charcoal box, the measurement chamber 6 are visited close to the one end of screening cover 5 in NaI
The rear portion of head chamber 4 is provided with shielding bonnet, shields and is provided with the compression for being used for compressing NaI probes between bonnet and NaI probe chambers 4
Block 3.
Lead screen measuring chamber appearance and size is 270 × 522mm of Φ, wherein, measurement chamber enclosure 1 appearance and size be Φ 270 ×
400mm, material are painted for mild steel.The material of compact heap 3 is elastomer, when NaI probe placements in pop one's head in chamber in when, pass through
The dilatation of compact heap causes NaI probes top to be brought into close contact with stainless steel cladding, and compact heap 3 designs for cylindrical annular, in
Between cavity be used for NaI probe data wire and power line lead.
The inner materials of screening cover 5 are lead, are molded using Low background lead one-piece casting, avoid foam inside, ensure that density is equal
Even, lead layer thickness is 100mm, realizes that 4pi directions shield, enclosure material paints for mild steel.Screening cover 5 is fixed by hinge 14
In lead screen room (see Fig. 2), screening cover can free open and close, open screening cover, iodine can be sampled charcoal box and be positioned over measurement chamber
It is interior, screening cover is then shut off, starts to measure.
It is Φ 55mm × 27mm to measure the inside dimension of chamber 6, and for placing iodine sampling charcoal box, measurement intracavitary is provided with one layer of stainless steel
Involucrum 7, realize that testing sample is isolated with what NaI popped one's head in, convenient cleaning and decontamination.
The inner materials of lead screen room 8 are lead, are molded using Low background lead one-piece casting, avoid foam inside, ensure density
Uniformly, lead layer thickness is 100mm, realizes that 4pi directions shield, lead layer is externally provided with mild steel involucrum.The inner chamber of lead screen room 8 is provided with
NaI probe chambers, for disposing NaI to pop one's head in, its inside dimension is consistent with selected NaI probes.
Shield bonnet includes two altogether, respectively shields bonnet I 9 and shielding bonnet II 11, inner materials are lead, are used
Low background lead one-piece casting is molded, and avoids foam inside, ensures even density, and the total lead layer thickness of shielding bonnet I, II is more than
100mm, realize that 4pi directions shield, lead layer is externally provided with mild steel involucrum, shielding bonnet I 9 and shielding bonnet II 11 in nested knot
Structure, two shielding bonnets between form the labyrinth structure 10 for drawing NaI probe datas line and power line.Two shielding bonnets
Between connected by bolt 12, shield and be bolted between bonnet and lead screen room.
Shielding bonnet I, II, compact heap and NaI probe erection sequence be：First by NaI probe placements in probe chamber,
Compact heap is embedded in and is fixed on shielding bonnet II, the data wire of NaI probes, power line are drawn from labyrinth structure, used
Bolt is fixed on bonnet II is shielded on lead screen room, then the data wire of NaI probes, power line are drawn from shielding bonnet I labyrinth
Go out, will shield bonnet I using bolt is fixed on shielding bonnet II, installation.
As shown in Fig. 2 suspension ring 2 are installed on measuring chamber shell upper position, the lifting overall for lead screen measuring chamber is removed
Fortune.The material of measuring chamber fixed mount 13 is mild steel, is weldingly fixed on measuring chamber outer casing underpart, the position for lead screen measuring chamber
It is fixed.
Embodiment 1
Lead screen measuring chamber design machine, from Ortec NaI pop one's head in, first by NaI probe placements in probe chamber,
Compact heap is embedded in and is fixed on shielding bonnet II, the data wire of NaI probes, power line are drawn from labyrinth, use bolt
Shielding bonnet II is fixed on lead screen room, then the data wire of NaI probes, power line are drawn from shielding bonnet I labyrinth, is made
Bonnet I will be shielded with bolt to be fixed on shielding bonnet II, gamma ray spectrometer installation.
New iodine sampling charcoal box sample is put into measurement intracavitary, covers screening cover.Time of measuring and voltage are set, typically
It is set as 3600 seconds, carries out the measurement of background count stability, records the tale and net count of measurement.Duplicate measurements 5 times, meter
Calculate the relative deviation of background count.Measure the relative deviation that the gamma ray spectrometer measured environmental exact details be respectively+2.20% ,-
3.65%th, -2.49% ,+0.49% ,+4.24%, as a result in the range of requirement value ± 5%.Illustrate that the lead screen measures
Room is designed to the requirement for meeting NaI probes.
The iodine for having gathered sample sampling charcoal box is put into measurement intracavitary, covers screening cover.Time of measuring and voltage are set,
It is usually set to 300 seconds, carries out the measurement of sample count stability, records the tale and net count of measurement.Duplicate measurements 5
It is secondary, calculate the relative deviation of sample count.Measure the relative deviation that the gamma ray spectrometer measured sample be respectively+0.45% ,-
0.90%th ,+0.34% ,+0.67% ,+0.77%, as a result in the range of requirement value ± 5%.Illustrate that the lead screen measures
The requirement for being designed to meet NaI probes of room.
Embodiment 2
Certain nuclear power station air cleaning system DVK001PI systems are provided with one-level iodine adsorber framed bent, according to nuclear safety codes and
The regulation of core professional standard, the coefficient of purification of iodine adsorber row need to be measured.
According to the requirement of DVK001PI system iodine adsorber performance test codes, systematic air flow is adjusted to nominal air delivery
In the range of ± 10%, according to measure-radiation of standard EJ/T 1183-2005 core air cleaning system iodine adsorber coefficient of purification
Property methyl iodide method is tested.Methyl iodine generator, upstream and downstream sampling apparatus are connected with system, after confirmation is errorless, started
Upper and lower sampling apparatus, and adjust sampling flow.
Start methyl iodine generator, by the CH of generation3 131I gases are injected into tested ventilating system pipeline by ascending pipe.
After sampling terminates, the radioactivity for measuring each efficiently filter membrane and iodine sampling charcoal box respectively with the gamma ray spectrometer of installation is lived
Degree, by comparing the total activity of upstream and downstream sample, the coefficient of purification for trying to achieve system iodine adsorber row is 1800, more than experiment
The requirement of regulatory requirements value >=100, result of the test are qualified.
Embodiment 3
Certain nuclear power station air cleaning system DVC001PI systems are provided with two-stage level iodine adsorber framed bent, according to nuclear safety codes
With the regulation of core professional standard, the coefficient of purification that the iodine adsorber is arranged need to be measured.
According to the requirement of DVC001PI system iodine adsorber performance test codes, systematic air flow is adjusted to nominal air delivery
In the range of ± 10%, according to measure-radiation of standard EJ/T 1183-2005 core air cleaning system iodine adsorber coefficient of purification
Property methyl iodide method is tested.Methyl iodine generator, upstream and downstream sampling apparatus are connected with system, after confirmation is errorless, started
Upper and lower sampling apparatus, and adjust sampling flow.
Start methyl iodine generator, by the CH of generation3 131I gases are injected into tested ventilating system pipeline by ascending pipe.
After sampling terminates, the radioactivity for measuring each efficiently filter membrane and iodine sampling charcoal box respectively with the gamma ray spectrometer of installation is lived
Degree, by comparing the total activity of upstream and downstream sample, the coefficient of purification for trying to achieve system iodine adsorber row is 14000, more than experiment
The requirement of regulatory requirements value >=1000, result of the test are qualified.
Obviously, those skilled in the art can carry out various changes and modification without departing from this practicality to the utility model
New spirit and scope.So, if belonging to the utility model claims to these modifications and variations of the present utility model
And its within the scope of equivalent technology, then the utility model is also intended to comprising including these changes and modification.
Claims (10)
- A kind of 1. lead screen measuring chamber suitable for NaI probes, it is characterised in that：Including being arranged in measurement chamber enclosure (1) Lead screen room (8), one end of the lead screen room (8) are connected with screening cover (5), and NaI is provided with lead screen room (8) and is visited Head chamber (4) and the measurement chamber (6) for placing iodine sampling charcoal box, the measurement chamber (6) is close to screening cover (5) one end, in NaI The rear portion of probe chamber (4) is shielded between bonnet and NaI probe chambers (4) provided with for compressing NaI probes provided with shielding bonnet Compact heap (3).
- 2. as claimed in claim 1 suitable for the lead screen measuring chamber of NaI probes, it is characterised in that：In the measurement chamber (6) One layer of stainless steel cladding (7) is inside provided with, for realizing that testing sample is isolated with what NaI popped one's head in.
- 3. as claimed in claim 1 or 2 suitable for the lead screen measuring chamber of NaI probes, it is characterised in that：After described shielding Lid shares two, in nested structure, is formed between two shielding bonnets (9,11) for drawing NaI probe datas line and power line Labyrinth structure (10).
- 4. as claimed in claim 3 suitable for the lead screen measuring chamber of NaI probes, it is characterised in that：After described two shieldings Lid (9,11) uses the integrated poured shaping of Low background lead.
- 5. as claimed in claim 3 suitable for the lead screen measuring chamber of NaI probes, it is characterised in that：Two shielding bonnet (9, 11) it is bolted between, shields and be bolted between bonnet and lead screen room (8).
- 6. as claimed in claim 1 suitable for the lead screen measuring chamber of NaI probes, it is characterised in that：The screening cover (5) is logical Hinge (14) is crossed with measurement chamber enclosure to be connected.
- 7. the lead screen measuring chamber for being applied to NaI probes as described in claim 1 or 6, it is characterised in that：In screening cover (5) Portion's material is lead, and shell is mild steel spray painting material.
- 8. as claimed in claim 1 suitable for the lead screen measuring chamber of NaI probes, it is characterised in that：The compact heap (3) is Flexible cylindrical annular structure, intermediate annular cavity are used for the data wire and power line for drawing NaI probes.
- 9. as claimed in claim 1 suitable for the lead screen measuring chamber of NaI probes, it is characterised in that：In measurement chamber enclosure (1) Top, which is provided with, is used for the suspension ring (2) that measuring chamber integral hoisting is carried.
- 10. as claimed in claim 1 suitable for the lead screen measuring chamber of NaI probes, it is characterised in that：In measurement chamber enclosure (1) bottom is provided with measuring chamber fixed mount (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720624114.2U CN206788380U (en) | 2017-06-01 | 2017-06-01 | A kind of lead screen measuring chamber suitable for NaI probes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720624114.2U CN206788380U (en) | 2017-06-01 | 2017-06-01 | A kind of lead screen measuring chamber suitable for NaI probes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206788380U true CN206788380U (en) | 2017-12-22 |
Family
ID=60713984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720624114.2U Active CN206788380U (en) | 2017-06-01 | 2017-06-01 | A kind of lead screen measuring chamber suitable for NaI probes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206788380U (en) |
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2017
- 2017-06-01 CN CN201720624114.2U patent/CN206788380U/en active Active
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