JPH0337108Y2 - - Google Patents
Info
- Publication number
- JPH0337108Y2 JPH0337108Y2 JP1982103181U JP10318182U JPH0337108Y2 JP H0337108 Y2 JPH0337108 Y2 JP H0337108Y2 JP 1982103181 U JP1982103181 U JP 1982103181U JP 10318182 U JP10318182 U JP 10318182U JP H0337108 Y2 JPH0337108 Y2 JP H0337108Y2
- Authority
- JP
- Japan
- Prior art keywords
- radiation source
- metal
- polymer compound
- fire detector
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005855 radiation Effects 0.000 claims description 33
- 229910052751 metal Inorganic materials 0.000 claims description 29
- 239000002184 metal Substances 0.000 claims description 29
- 150000001875 compounds Chemical class 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 12
- 239000010410 layer Substances 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims 1
- 239000000941 radioactive substance Substances 0.000 claims 1
- 239000012857 radioactive material Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910001252 Pd alloy Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052695 Americium Inorganic materials 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- LXQXZNRPTYVCNG-UHFFFAOYSA-N americium atom Chemical compound [Am] LXQXZNRPTYVCNG-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Fire-Detection Mechanisms (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Description
【考案の詳細な説明】
この考案はイオン化式火災感知器に使用される
放射線源の改良に関するものである。[Detailed description of the invention] This invention relates to an improvement of a radiation source used in an ionization type fire detector.
従来よりイオン化式火災感知器の放射線源に
は、放射性物質が監視時あるいは火災時などに飛
散するのを防止するために放射性物質を金属で挟
持したいわゆる密封放射線源が使用されている。
この密封放射線源は、銀などで形成される厚さ
0.2〜0.5mm程度の金属ベース上にアメリシウム
241（Am241）などでなる厚さ数μｍ程度の放射性
物質層が設けられ、さらにその上に放射線を透過
させながら放射性物質の飛散を防止する金やパラ
ジウム合金でなる厚さ数μｍ程度の被覆金属層が
設けられて形成される積層体を所望の大きさに切
断し、この切断の際に被覆金属層あるいは金属ベ
ースの切断縁面が延展して放射性物質層の切断面
を被覆することにより製作される。ところでこの
ように製作される密封放射線源は、放射性物質層
の切断面の密封を切断時における金属の延性を利
用して行なつているため、金属が十分に延展しな
かつたり、あるいは延展した金属が他方の金属に
十分に密着しなかつたりして空隙が生じているも
のがあつた。このため、このような放射線源を組
み込んだ火災感知器をコンビナート地帯や温泉地
帯など悪硫酸ガスなどの腐食性ガスが発生する場
所で使用すると、上記空隙より腐食性ガスが内部
に侵入して金属ベースなどが腐食され、この結果
放射線源が黒色化を呈して放射線量が低下し、火
災感知器は誤報を生じるようになつたり不動作状
態となつたりする問題がある。このため、金属ベ
ースと被覆金属層とを加熱して溶融密着すること
も考えられているが、金属を高温に加熱して溶融
させなければならず高価な装置を必要とするとと
もに作業が面倒であるため実用的でない欠点があ
る。また上記のように製作された放射線源を更に
金やステンレスなどの金属で被覆することも考え
られるが、この場合には放射線放出面を被覆する
金属が厚く放射線の減衰量が大きいので放射線の
量を多くしなければならない欠点がある。また放
射性物質層の切断面が被覆金属層と金属ベースと
によつて完全に密封されている放射線源であつて
も、被覆金属層が放射線を透過させるためごく薄
いので、このため電極板などに放射線源を固定す
る際に工具あるいは固定用爪片によつて目に見え
ないような損傷を受け、この損傷箇所より腐食性
ガスが放射線源内に侵入して腐食が生じる問題も
ある。 BACKGROUND ART Conventionally, a so-called sealed radiation source in which a radioactive material is sandwiched between metals has been used as a radiation source for an ionization fire detector to prevent the radioactive material from scattering during monitoring or in the event of a fire.
This sealed radioactive source is made of silver, etc.
Americium on a metal base of about 0.2~0.5mm
241 (Am 241 ), etc., with a thickness of several micrometers, and on top of that, a coating of gold or palladium alloy with a thickness of several micrometers, which prevents the scattering of radioactive materials while allowing radiation to pass through. By cutting the laminate formed with the metal layer into a desired size, and at the time of cutting, the cut edge of the coating metal layer or metal base extends to cover the cut surface of the radioactive material layer. Manufactured. By the way, the sealed radiation source manufactured in this way uses the ductility of the metal at the time of cutting to seal the cut surface of the radioactive material layer, so the metal may not spread sufficiently or the spread metal may In some cases, the metal did not adhere sufficiently to the other metal, resulting in voids. Therefore, if a fire detector incorporating such a radiation source is used in a place where corrosive gas such as bad sulfuric acid gas is generated, such as an industrial complex or a hot spring area, the corrosive gas may enter the interior through the above-mentioned void and damage the metal. The base etc. are corroded, and as a result, the radiation source exhibits a black coloration, the radiation dose decreases, and there is a problem that the fire detector starts to generate false alarms or becomes inoperable. For this reason, it has been considered to heat the metal base and the coating metal layer to melt and adhere them, but this requires expensive equipment and is cumbersome as it requires heating the metal to a high temperature to melt it. There are drawbacks that make it impractical. It is also possible to further coat the radiation source manufactured as described above with a metal such as gold or stainless steel, but in this case, the metal covering the radiation emitting surface is thick and the attenuation of radiation is large, so the amount of radiation is The disadvantage is that it requires a lot of Furthermore, even if the cut surface of the radioactive material layer is a radiation source that is completely sealed by the metal coating layer and the metal base, the metal coating layer is very thin because it allows radiation to pass through, so it cannot be used on electrode plates, etc. There is also the problem that when fixing the radiation source, invisible damage is caused by tools or fixing claws, and corrosive gas enters the radiation source through this damaged location, causing corrosion.
この考案は上記の点にかんがみ、耐腐食性の高
い、また取り付けの際に損傷を受けにくいイオン
化式火災感知器の放射線源を提供するものであ
る。 In view of the above points, this invention provides a radiation source for an ionization fire detector that is highly corrosion resistant and less likely to be damaged during installation.
以下この考案の１実施例を図面により説明する
と、Am241などでなる放射性物質層１１が銀ある
いはその他の金属でなる厚さ0.2〜0.5mm程度の金
属ベース１２と金やパラジウム合金あるいはその
他の金属でなる厚さ数μｍ程度の被覆金属層１３
とで挟持されてなる放射線源１が、高い耐食性を
有するプラスチツクなどの高分子化合物製の２枚
のシート２１，２２間に挿入される。そしてこの
放射線源１が挿入された２枚の高分子化合物製シ
ート２１，２２はその周縁部２３が加熱されて溶
着され、放射線源１の全面が高分子化合物によつ
て被覆密封される。 One embodiment of this invention will be described below with reference to the drawings. A radioactive material layer 11 made of Am 241 or the like is made of a metal base 12 of about 0.2 to 0.5 mm thick made of silver or other metal, and a metal base 12 of gold, palladium alloy, or other metal. A coating metal layer 13 with a thickness of about several μm consists of
The radiation source 1 is inserted between two sheets 21 and 22 made of a polymer compound such as plastic that has high corrosion resistance. The peripheral edges 23 of the two polymer compound sheets 21 and 22 into which the radiation source 1 has been inserted are heated and welded, and the entire surface of the radiation source 1 is covered and sealed with the polymer compound.
このように高分子化合物によつて全面が被覆密
封される放射線源は、高分子化合物の被覆層を厚
くしてもその原子および分子密度は金属に比べ小
さいので放射線の強さが減衰されることがなく、
しかも腐食性ガスに対し高い耐食性が得られる効
果がある。また、放射線源を電極板などに取り付
ける際には、高分子化合物の被覆層が緩衝材とし
ての役割を果たすので、損傷されにくい効果が生
じる。 In a radiation source whose entire surface is covered and sealed with a polymer compound, even if the coating layer of the polymer compound is thick, its atomic and molecular density is smaller than that of metal, so the intensity of the radiation is attenuated. There is no
Moreover, it has the effect of providing high corrosion resistance against corrosive gases. Furthermore, when attaching the radiation source to an electrode plate or the like, the coating layer of the polymer compound serves as a buffer material, making it less likely to be damaged.
なお、放射線源を高分子化合物で被覆密封する
のに、上記実施例以外に、耐食性のある例えばエ
ポキシ系樹脂の溶液中に浸漬させるなどして高分
子化合物の被覆を形成するようにしてもよい。 Note that in order to coat and seal the radiation source with a polymer compound, in addition to the above embodiments, a coating of a polymer compound may be formed by immersing it in a solution of a corrosion-resistant epoxy resin, for example. .
この考案によれば、高い耐腐食性を有し、かつ
損傷を受けにくいイオン化式火災感知器の放射線
源が得られる。 According to this invention, it is possible to obtain a radiation source for an ionization fire detector that has high corrosion resistance and is less susceptible to damage.
図面は、この考案によるイオン化式火災感知器
の放射線源の１実施例の断面図である。
１１……放射性物質、１２……金属ベース、１
３……被覆金属層、２１，２２……高分子化合物
のシート。
The drawing is a sectional view of one embodiment of the radiation source of the ionization fire detector according to this invention. 11...Radioactive material, 12...Metal base, 1
3...Coating metal layer, 21, 22... Sheet of polymer compound.
Claims (1)
つて挟持されてなる放射線源の全面に耐腐食性
を有する高分子化合物の被覆層が設けられ、該
被覆層によつて放射線源が密封されてなること
を特徴とするイオン化式火災感知器の放射線
源。 ２ 放射線源を高分子化合物のシートで被覆して
なる実用新案登録請求の範囲第１項記載のイオ
ン化式火災感知器の放射線源。 ３ 放射線源を液状の高分子化合物に浸漬して被
覆層を形成してなる実用新案登録請求の範囲第
１項記載のイオン化式火災感知器の放射線源。[Claims for Utility Model Registration] 1. A radiation source in which a radioactive substance is sandwiched between a metal base and a coating metal layer is provided with a coating layer of a polymer compound having corrosion resistance on the entire surface, and the coating layer is Therefore, a radiation source for an ionization fire detector is characterized in that the radiation source is sealed. 2. A radiation source for an ionization fire detector according to claim 1 of the utility model registration, which comprises covering the radiation source with a sheet of a polymer compound. 3. A radiation source for an ionization fire detector according to claim 1, which is obtained by immersing the radiation source in a liquid polymer compound to form a coating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10318182U JPS5911390U (en) | 1982-07-09 | 1982-07-09 | Ionization fire detector radiation source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10318182U JPS5911390U (en) | 1982-07-09 | 1982-07-09 | Ionization fire detector radiation source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5911390U JPS5911390U (en) | 1984-01-24 |
| JPH0337108Y2 true JPH0337108Y2 (en) | 1991-08-06 |
Family
ID=30242864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10318182U Granted JPS5911390U (en) | 1982-07-09 | 1982-07-09 | Ionization fire detector radiation source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5911390U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5440788U (en) * | 1977-08-23 | 1979-03-17 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5734444Y2 (en) * | 1977-08-22 | 1982-07-29 |
-
1982
- 1982-07-09 JP JP10318182U patent/JPS5911390U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5440788U (en) * | 1977-08-23 | 1979-03-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5911390U (en) | 1984-01-24 |
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