CN2904006Y - Radioactivity aviluating test box for indoor enviornment - Google Patents

Abstract

The utility model provides an indoor environment radioactivity evaluation measurement box, which comprises a box body, a box cover, a sealing ring, and a detecting element. A detection element is arranged on the inner side box bottom, a groove is arranged on the outer side of the box bottom, the detection element is arranged in the groove. The box mouth is arranged with external screw, and a internal screw is arranged on the box cover, a blowhole is arranged on the box cover surface, and inner side of the blowhole is covered with filter membrane; a seal ring is arranged around inner side of the box cover bottom, the vertically distributed supports are arranged on the edge of the box cover external surface, the box cover is fastened with the box body through screw. The measurement box can be used independently, and also can be used in combination of two boxes; can precisely detect [222]<Rn> activity concentration, [220]<Rn> activity concentration and Gamma external dose rate, and a deposition rate research detector of the [220]<Rn> daughter [212]<Po> is also arranged. The utility model has advantages of simple structure, easy processing, low manufacture cost; and also can be used to beautify the indoor environment after tying decoration on the support column.

Description

The indoor environment radioactivity is estimated measuring box

Technical field

The utility model relates to a kind of passive accumulation formula pick-up unit of indoor environment radiomaterial, and particularly a kind of being applicable to can be detected indoor environment simultaneously ²²²The Rn activity concentration, ²²⁰The Rn activity concentration, ²²⁰The Rn daughter ²¹²The measuring box of the deposition of Po and γ external irradiation dose rate.

Background technology

From 1860s, ²²²The harm of Rn obtains paying attention to, ²²²The measuring technique of Rn and daughter thereof constantly develops, ²²²The Rn measurement mainly contains active and two kinds of methods of passive type, ²²²The passive accumulation formula measuring method of Rn is very reliable when estimation human body radioactive dose, normal the method that adopts in the evaluation of Indoor Niton.The passive type solid state nuclear track detector kind of countries in the world development is a lot, mainly can be divided into three types: the radon method is surveyed in (1) direct or similar direct exposure, as Chinese patent ZL 03250229.X (September 22 2004 Granted publication day, denomination of invention " room gross activity detector "), the accuracy of measuring is relatively poor, and existing national standard does not adopt the method; (2) survey the radon agar diffusion method, survey radon cup (German radiation research center Urban M. and Piesch E. development), deliver for 97 pages at " radiation protection dosage " (Radiation ProtectionDosimetry) first phase the 2nd in 1981 volume, because in the air as KFK ²²⁰Rn has influenced ²²²The measurement of Rn, its measurement result is generally higher; (3) Guo of Japan Nagoya university, Q., T.Iida, scholars such as K.Okamoto nineteen ninety-five " nuclear science technology magazine " (J.Nucl.sci.Technol.) the semisphere stainless steel delivered of the 794-803 page or leaf of the 32nd phase survey the radon device, owing to be subject to the influence of factors such as humidity, efficiency of measurement is low, mainly is limited to small-scale laboratory study.

Summary of the invention

Goal of the invention of the present utility model provides a kind of indoor use that is applicable to, can accurately detect ²²²The Rn activity concentration, ²²⁰Rn activity concentration and γ external irradiation dose rate, and be provided with ²²⁰The daughter of Rn ²¹²The detector of Po deposition research is intended to solve the detector that can measure above-mentioned four evaluation indexes simultaneously of domestic and international shortage, with the indoor radioactive level of comprehensive evaluation.

The utility model is achieved through the following technical solutions:

A kind of indoor environment radioactivity is estimated measuring box, by box body 2, lid 1, O-ring seal 8, detecting element is formed, it is characterized in that: the inside bottom centre of box body 2 is provided with detecting element, the bottom outside of box body 2 is provided with groove A7 or groove B15, in groove A7 or the groove B15 detecting element is set, the opening part of box body 2 is provided with external thread, lid 1 is provided with internal thread, lid 1 surface is provided with air hole A9 or air hole B12, inboard filter membrane A5 or the filter membrane B11 of covering of air hole A9 or air hole B12, around lid 1 inside bottom O-ring seal 8 is set, lid 1 outside surface edge is provided with the vertical distribution supporter, and lid 1 passes through screw threads for fastening with box body 2.

Preferably, mass thickness is set is 1.64mg/cm to the inside bottom of box body 2 ²CR-39 track sheet A6 or track sheet B13 that aluminium foil covers, in the exterior bottom of box body mass thickness being set is 11.16mg/cm ²CR-39 track sheet C14 or thermoluminescence dosage sheet 10[LiF (MgCuP) that aluminium foil covers] as detecting element, inboard filter membrane A5 or the filter membrane B11 of covering of air hole A9 or air hole B12, the lid outside surface is provided with the spill and/or the contour supporter of convex of vertical distribution, the length of supporter is 2～30mm, wherein supporter can be convex post 4 and concave column 3 interval symmetric offset spread, also can be convex post 4 or concave column 3 simultaneously, lid 1 passes through screw threads for fastening with box body 2.

When above-mentioned measuring box uses separately, with the supporter on lid 1 outside surface down, be placed on apart from wall a distance and just can carry out the detection of corresponding purpose.When detecting a plurality of test item simultaneously, two measuring boxes are plugged on together, form an opening gas inverting chamber between two measuring boxes, make the lid 1 ventilation A9 of one of them measuring box be limited to 4～5mm, the lid 1 air hole B12 that makes another measuring box reaches maximal value according to the design of lid 1, can on support column, fasten hanging wire 16 and ornament 17, the extended line of hanging wire 16 is vertically divided two lids, 1 line of centres equally during vertical hanging, two measuring boxes that will link together are then placed or are hung on apart from wall a distance, are used in the measuring chamber ²²⁰The Rn activity concentration, ²²²The Rn activity concentration, ²¹²The γ external irradiation dose rate of natural radionuclides such as the radium of the deposition of Po and building materials etc., thorium, potassium emission.

The beneficial effects of the utility model are: (1) can measure indoor environment simultaneously ²²²Rn concentration, ²²⁰Rn concentration, ²²⁰The Rn daughter ²¹²The deposition of Po and γ external irradiation dose rate four indices; (2) right ²²²The Rn activity concentration, ²²⁰The measurement of Rn activity concentration almost is to enter two in same point to detect box, the measuring position accurate positioning, so calculate ²²²The Rn activity concentration, ²²⁰Rn activity concentration numerical value is more accurate, and comparability is stronger; (3) measuring box can be used singly or in combination according to research, measurement purpose, and is very convenient; (4) by University Of Nanhua's standard radon chamber preliminary experiment scale, ²²²The detection efficiency of Rn is 5.14tracks cm ^-2(kBqm ^-3h ^-1) ^-1, be the Japanese similar detector efficiency 2.62tracks cm of present domestic use ^-2(kBqm ^-3h ^-1) ^-11.96 times.(5) the utility model is simple in structure, is easy to processing, and manufacturing cost is very low, can also beautify living environment after fastening ornament on the support column.

Description of drawings

Further specify below in conjunction with accompanying drawing.

Fig. 1 is the evaluation of indoor environment radioactivity ²²²Rn measuring box structural representation.

Fig. 2 is that the indoor environment radioactivity is estimated composite measurement box structural representation.

Among the figure: 1, lid 2, box body 3, concave column 4, convex post 5, filter membrane A

6, CR-39 track sheet A 7, groove A 8, O-ring seal 9, air hole A

10, thermoluminescence dosage sheet 11, filter membrane B 12, air hole B 13, CR-39 track sheet B

14, CR-39 track sheet C 15, groove B 16, hanging wire 17, ornament

18, stator

Specific embodiment

Embodiment 1:

Measuring box box body 2 is made by ABS plastic, and box body 2 is made into cup shell, and box body 2 be 4.1cm deeply, at the bottom of the box and the angle of box wall be 100 °.Inside bottom at measuring box is provided with CR-39 track sheet A6 (covering 1.64mg/cm ²Aluminium foil) as detecting element, opening part in cup shell is provided with external thread, size according to box body 2 is made lid 1, on lid 1 internal thread is set, it is 4.5mm air hole A9 that lid 1 surperficial central authorities are provided with diameter, and air hole A9 goes up and covers filter membrane nitrocellulose A5 (MEMBRANE FILTER, aperture 0.8 μ m), around lid 1 inside bottom O-ring seal 8 is set, lid 1 outside surface is provided with contour support column, and lid 1 passes through screw threads for fastening with box body 2.Support column is placed on indoor down apart from just carrying out on wall certain distance, liftoff about the 1 meter desktop ²²²The detection of Rn activity concentration.

Embodiment 2:

Get the measuring box in the example 1, the contour support column of lid 1 outside surface is concave column 3 and/or convex post 4, and the external diameter of convex post 4 equates that with the internal diameter of concave column 3 (hollow-core construction of the external form of convex post 4 and concave column 3 is consistent, can be cylindrical, also can be prismatic), make its symmetric offset spread at interval.Get the same box body of another one 2, side bottom is provided with same CR-39 track sheet B13 as detecting element within it, get above-mentioned lid 1, only the air hole B12 that diameter is 48.0mm is set with lid 1 difference in the example 1 for central authorities, the support column of above-mentioned two detection boxes by lid 1 outside surface closely is plugged on together, fasten hanging wire 16 on a pair of therein support column that is plugged on together, after hanging up ornament 17 on the support column of symmetry, be fixed on ceiling with gelatin sponge stator 18 and (press research apart from the position of wall a distance, Testing requirement is determined), lay the regular hour according to measurement requirement and (to be generally 3 months, 6 months, 12 months), change the dosage sheet and generally be no more than 6 months.After placement finished, with the measurement of the CR-39 track sheet A6 in the measuring box box body in the example 12 was the placement location place ²²²The Rn activity concentration, what the CR-39 track sheet B13 in the another one box body 2 measured is the placement location place ²²²Rn, ²²⁰Rn mixing activity concentration can carry out chemical etching at certain etching condition, and use ordinary optical microscope to survey and read track density, by ²²²Rn, ²²⁰The calibration factor of Rn calculates respectively ²²²Rn, ²²⁰The activity concentration of Rn.

Because almost being the same point at interior space certain position place, detected gas enters two detection boxes, so not only accurate positioning ( ²²⁰The Rn activity concentration is index percent in the distance of the distribution of the interior space and wall and subtracts, so the accuracy of measuring position is very important, accurate positioning, measurement data just has comparability), and calculate ²²²The Rn activity concentration, ²²⁰Rn activity concentration numerical value is more accurate, and comparability is stronger.

Embodiment 3:

In embodiment 2, each and every one box body 2 outer bottoms are provided with groove B15 at another, cover 11.16mg/cm ²Aluminium foil CR-39 track sheet C14 is used for a certain position in the measuring cell ²¹²The deposition of Po is to research and analyse indoor a certain position ²²⁰The Rn activity concentration with ²¹²The relation of the α particle deposition of Po emission cooperates and measures ²²⁰The centinormal 1 measurement of Rn daughter balance is under the research certain condition ²²⁰Rn daughter balance N with ²¹²The relation of the deposition of Po is measured for using this deposition device ²²⁰The measuring box that the centinormal 1 further research of Rn daughter balance facilitates.

Embodiment 4:

In embodiment 3, at another box body 2 outer bottoms groove A7 is set, cover LiF (MgCuP) thermoluminescence dosage sheet 10, be used to detect indoor environment γ external irradiation dose rate, so just can measure indoor environment simultaneously ²²²The Rn activity concentration, ²²⁰The Rn activity concentration, ²²⁰The Rn daughter ²¹²The deposition of Po and γ external irradiation dose rate four indices.

Claims (6)

1, a kind of indoor environment radioactivity is estimated measuring box, by box body (2), lid (1), O-ring seal (8), detecting element is formed, it is characterized in that: the inside bottom centre of box body (2) is provided with detecting element, the bottom outside of box body (2) is provided with groove A (7) or groove B (15), in groove A (7) or the groove B (15) detecting element is set, the opening part of box body (2) is provided with external thread, lid (1) is provided with internal thread, lid (1) surface is provided with air hole A (9) or air hole B (12), inboard filter membrane A (5) or the filter membrane B (11) of covering of air hole A (9) or air hole B (12), O-ring seal (8) is set around lid (1) inside bottom, lid (1) outside surface edge is provided with the vertical distribution supporter, and lid (1) passes through screw threads for fastening with box body (2).

2, indoor environment radioactivity according to claim 1 is estimated measuring box, and it is characterized in that: the length of supporter is 2～30mm.

3, indoor environment radioactivity according to claim 2 is estimated measuring box, and it is characterized in that: lid (1) outside surface supporter is contour concave column (3) and/or convex post (4).

4, indoor environment radioactivity according to claim 3 is estimated measuring box, it is characterized in that: lid (1) its concave column of outside surface supporter (3) and/or convex post (4) be symmetric offset spread at interval, concave column (3) and/or convex post (4) can closely be pegged graft, and form an opening gas inverting chamber between two measuring boxes.

5, estimate measuring box according to each described indoor environment radioactivity in the claim 3, it is characterized in that: two indoor environment radioactivity are estimated measuring box and are plugged on together by concave column (3) and/or convex post (4), form an opening gas inverting chamber between two measuring boxes.

6, estimate measuring box according to claim 4 or 5 described indoor environment radioactivity, it is characterized in that: can fasten hanging wire (16) and ornament (17) on concave column (3), the extended line of hanging wire during vertical hanging (16) is vertically divided two lids (1) line of centres equally.

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