JPS6361999A - X-ray shielding member - Google Patents
X-ray shielding memberInfo
- Publication number
- JPS6361999A JPS6361999A JP20590986A JP20590986A JPS6361999A JP S6361999 A JPS6361999 A JP S6361999A JP 20590986 A JP20590986 A JP 20590986A JP 20590986 A JP20590986 A JP 20590986A JP S6361999 A JPS6361999 A JP S6361999A
- Authority
- JP
- Japan
- Prior art keywords
- ray
- shielding member
- rays
- ray shielding
- members
- 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.)
- Pending
Links
- 238000010521 absorption reaction Methods 0.000 claims description 31
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims description 9
- 239000011733 molybdenum Substances 0.000 claims description 9
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052721 tungsten Inorganic materials 0.000 claims description 8
- 239000010937 tungsten Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、Ｘ線発生源から曝射されたＸ線を遮蔽するた
めのＸ線遮蔽部材に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an X-ray shielding member for shielding X-rays emitted from an X-ray generation source.
（従来の技術）
例えばＸ線診断装置におけるＸ線検出器に不要なＸ線が
入射することを防止するため、あるいは、Ｘ線ＣＴ装置
におけるコリメータに対するＸ線遮蔽を行なうため、鉛
（Ｐｂ）、タングステン（Ｗ）、モリブデン（Ｍｏ）等
の材料を用いて構成したＸ線遮蔽部材が用いられている
。(Prior Art) For example, lead (Pb) is X-ray shielding members made of materials such as tungsten (W) and molybdenum (Mo) are used.
このようなＸ線遮蔽部材の従来例を第５図（ａ）（ｂ）
を参照して説明する。Conventional examples of such X-ray shielding members are shown in Figures 5(a) and 5(b).
Explain with reference to.
第５図（ａ）に示すＸ線遮蔽部材３Ｑは、鉛製の第１．
第２の部材３１Ａ、３１Ｂを重合配置することにより構
成され、Ｘ線管のようなＸ線発生源５０から＠射される
Ｘ線の通過領域に臨ませて配置させるようになっている
。The X-ray shielding member 3Q shown in FIG.
It is constructed by overlapping the second members 31A and 31B, and is arranged so as to face a region through which X-rays emitted from an X-ray generation source 50 such as an X-ray tube pass.
ここで、鉛（密度ρ＝ １１．３４ ＜’；ｊ／ｃｍ３
） ）に対するＸ線エネルギーＥ（ＫｅＶ）と質量吸収
係数μ／ρＣｃｒｉ／’ｊ＞の関係を第５図（ｂ ）に
示す。Here, lead (density ρ = 11.34 <'; j/cm3
) The relationship between the X-ray energy E (KeV) and the mass absorption coefficient μ/ρCcri/'j> is shown in FIG. 5(b).
第５図（ｂ）から明らかなように鉛は８８．０（ＫｅＶ
）においてに吸収端を有し、このに吸収端を境にして質
量吸収計数μ／ρが大きく変化する。As is clear from Figure 5(b), lead is 88.0 (KeV
) has an absorption edge, and the mass absorption coefficient μ/ρ changes greatly with this absorption edge as a boundary.
そして、この鉛製のＸ線遮蔽部材３０に対してＸ線が入
射した場合、第５図に示すように単色のＫＸ線（蛍光Ｘ
線）を再放出する。放出された蛍光Ｘ線は、Ｘ線遮蔽部
材３０にて再吸収されるものもあるが、一部は外に放出
される。このＸ線がＸ線検出器の遮蔽したい部分に当た
り、ノイズ他、検出器特性の劣化にもたらすことがある
。このような弊害は、タングステン製あるいはモリブデ
ン類のＸ線検出器の場合も全く同様に生じる。When X-rays are incident on this X-ray shielding member 30 made of lead, monochromatic KX-rays (fluorescent X-rays) as shown in FIG.
line). Some of the emitted fluorescent X-rays are reabsorbed by the X-ray shielding member 30, but some are emitted to the outside. These X-rays may hit the portion of the X-ray detector that is desired to be shielded, causing noise and other deterioration of the detector characteristics. Such problems occur in exactly the same way in the case of X-ray detectors made of tungsten or molybdenum.
（発明が解決しようとする問題点）
上述したように従来のＸ線遮蔽部材は、単一の材料を用
いて構成されたものであるため、ＫＸ線の再放出を伴い
十分な遮蔽効果を期待できず、また、吸収端のすぐ下の
エネルギーでの吸収係数が極端に小ざいことにより、Ｘ
線遮蔽部材の厚みを十分厚くしないと遮蔽効果がないと
いう問題がある。 そこで本発明は、Ｘ線の再放出のお
それがほとんどなく、十分な遮蔽効果を発揮し得るＸ線
遮蔽部材を提供することを目的とするものである。(Problems to be Solved by the Invention) As mentioned above, the conventional X-ray shielding member is constructed using a single material, and therefore a sufficient shielding effect is expected due to the re-emission of KX-rays. In addition, the absorption coefficient at the energy just below the absorption edge is extremely small, so
There is a problem that unless the thickness of the line shielding member is sufficiently thick, there is no shielding effect. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an X-ray shielding member that can exhibit a sufficient shielding effect with almost no possibility of re-emitting X-rays.
［発明の構成］
（問題点を解決するための手段）
本発明は、Ｘ線発生源からのＸ線を遮蔽するＸ線遮蔽部
材において、Ｘ線吸収端の異なる複数の部材を重合配置
することにより構成される。[Structure of the Invention] (Means for Solving the Problems) The present invention provides an X-ray shielding member for shielding X-rays from an X-ray generation source, in which a plurality of members having different X-ray absorption edges are arranged in a superimposed manner. Consisted of.
（作 用）
上記構成のＸ線遮蔽部材は、複数の部材が異なるＸ線吸
収端を有し、吸収エネルギーの高いものを線源に近いと
ころに配置するため、Ｘ線が入射した部材から再放出さ
れるＸ線は次段の部材により高効率に吸収される。また
、次段の部材のＸ線吸収端に対応する最初の部材の吸収
係数が高いので、この次段の部材にはそのＸ線吸収端近
辺のエネルギーをもつＸ線はごくわずかしか到達しない
。(Function) In the X-ray shielding member with the above configuration, multiple members have different X-ray absorption edges, and the one with higher absorption energy is placed near the radiation source, so that X-rays are re-received from the member on which the X-rays entered. The emitted X-rays are absorbed with high efficiency by the next stage member. Furthermore, since the absorption coefficient of the first member corresponding to the X-ray absorption edge of the next-stage member is high, only a small amount of X-rays having energy near the X-ray absorption edge reach this next-stage member.
（実施例） 以下に本発明の詳細な説明する。(Example) The present invention will be explained in detail below.
第１図は本発明の第１の実施例を示すもので必り、同図
に示すＸ線遮蔽部材１は鉛製の第１の部材２Ａと、タン
グステン製の第２の部材２Ｂとを重合配置することによ
り構成されている。FIG. 1 shows the first embodiment of the present invention, and the X-ray shielding member 1 shown in the figure is made by polymerizing a first member 2A made of lead and a second member 2B made of tungsten. It is configured by arranging.
このような構成を有するＸ線遮蔽部材１０作用を、第２
図に示す鉛及びタングステン（ρ＝１９゜３ （ｇ／ｃ
ｍ３） ）のＸ線エネルギーと質量吸収係数との特性を
も参照して説明する。尚、同図において第２の部材２Ｂ
に対するＸ線エネルギーと質量吸収係数との関係を一点
鎖線で示す。The action of the X-ray shielding member 10 having such a configuration is
Lead and tungsten (ρ=19°3 (g/c
This will be explained with reference to the characteristics of X-ray energy and mass absorption coefficient of m3). In addition, in the same figure, the second member 2B
The relationship between X-ray energy and mass absorption coefficient is shown by the dashed-dotted line.
Ｘ線発生源５０からのＸ線が第１の部材２Ａに入射する
と、この入射Ｘ線は第１の部材２Ａにより吸収されるが
、鉛のに吸収端ＥＰ１．（＝８８．０にｅｖ）において
ＫＸ線が再放出されこのＫＸ線は第２の部材２Ｂに入射
する。しかし、第２の部材２Ｂにおける前記鉛のに吸収
端［Ｅｐｂに対応する質量吸収係数（μ／ρ）工が第２
図に示すように大きいため、前記ＫＸ線は第２の部材２
Ｂにより高効率に吸収される。When X-rays from the X-ray source 50 enter the first member 2A, the incident X-rays are absorbed by the first member 2A, but the absorption edge EP1. (=88.0 ev), the KX-rays are re-emitted and enter the second member 2B. However, the mass absorption coefficient (μ/ρ) corresponding to the absorption edge [Epb] of lead in the second member 2B is
As shown in the figure, since the KX-ray is large, the second member 2
B is absorbed with high efficiency.
一方、第２の部材２Ｂのに吸収端Ｅｗ （＝６９゜５Ｋ
ｅＶ）に対応する第１の部材２Ａの質量吸収係数（μ／
ρ）■もこのに吸収＠Ｅｗの最下点の値よりも高いので
、Ｋ吸収端Ｅｗ近辺のエネルギーをもつＸ線はごくわず
かしか第２の部材２Ｂに到達しない。On the other hand, the absorption edge Ew (=69°5K
eV) of the first member 2A corresponding to the mass absorption coefficient (μ/
Since ρ)■ is also higher than the value of the lowest point of absorption @Ew, only a small amount of X-rays with energy near the K absorption edge Ew reach the second member 2B.
以上説明したＸ線遮蔽部材１の作用により、第２の部材
２Ｂはそれ自身のＫＸ線及び第１の部材２ＡによるＫＸ
線をほとんど外部に放出することがなく、これにより図
示しないＸ線検出器に対する悪影響が回避される。Due to the action of the X-ray shielding member 1 explained above, the second member 2B is exposed to the KX-rays caused by its own KX-rays and the first member 2A.
Almost no radiation is emitted to the outside, thereby avoiding adverse effects on an X-ray detector (not shown).
第３図（ａ＞は本発明の第２の実施例を示すものであり
、同図に示すＸ線遮蔽部材１Ｑは第１の部材１１Ａとし
て鉛製のものを、第２の部材１１Ｂとしてモリブデン類
（密度ρ＝１０．２ （ｙ／ｃｍ３））のものを用いた
点が前記Ｘ線遮蔽部材１と相違している。尚、モリブデ
ンのに吸収端ＫＭＯは２０．０（Ｋ ｅＶ）である。ま
た、これら両者のＸ線エネルギーと質量吸収係数との関
係を第３図（ｂ）に示す。同図において第２の部材１１
ＢのＸ線エネルギーと質量吸収係数との関係を二点鎖線
で示す。FIG. 3 (a) shows a second embodiment of the present invention, and the X-ray shielding member 1Q shown in the figure is made of lead as the first member 11A and molybdenum as the second member 11B. It differs from the X-ray shielding member 1 in that a material of the same type (density ρ = 10.2 (y/cm3)) is used.The absorption edge KMO of molybdenum is 20.0 (K eV). In addition, the relationship between the X-ray energy and the mass absorption coefficient for both of these is shown in FIG. 3(b).
The relationship between the X-ray energy of B and the mass absorption coefficient is shown by a two-dot chain line.
このＸ線遮蔽部材１０の場合も前記Ｘ線遮蔽部材１の場
合と同様な作用、効果を発揮し、ＫＸ線をほとんど外部
に放出しない。This X-ray shielding member 10 also exhibits the same functions and effects as the X-ray shielding member 1, and hardly emits KX-rays to the outside.
第４図（ａ）は本発明の第３の実施例を示すものであり
、同図に示すＸ線遮蔽部材２０は、第１の部材２１Ａと
してタングステン類のものを、第２の部材２１Ｂとして
モリブデン製のものを用いることにより構成したもので
ある。これら両者のＸ線エネルギーと質量吸収係数との
関係を第４図（ｂ）に示す。FIG. 4(a) shows a third embodiment of the present invention, and the X-ray shielding member 20 shown in the figure is made of tungsten as the first member 21A and as the second member 21B. It is constructed by using molybdenum. The relationship between the X-ray energy and the mass absorption coefficient for both of these is shown in FIG. 4(b).
このＸＩ！遮蔽部材２０の場合も前記Ｘ線遮蔽部材１の
場合と同様な作用、効果を発揮し、ＫＸ線をほとんど外
部に放出しない。This XI! The shielding member 20 also exhibits the same functions and effects as the X-ray shielding member 1, and hardly emits KX-rays to the outside.
本発明は上記実施例に限定されるものではなくその要旨
の範囲内で種々の変形が可能である。The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the invention.
例えば、上記各実施例における第１．第２の部材の配列
の順序をそれぞれ逆にしても実施可能である。For example, the first example in each of the above embodiments. It is also possible to carry out the arrangement even if the order of arrangement of the second members is reversed.
［発明の効果］
以上詳述した本発明によれば、異なるＸ線吸収端を有す
る複数の部材を重合配置することにより、Ｘ線の再放出
のおそれがほとんどなく十分な遮蔽効果を発揮するＸ線
遮蔽部材を提供することができる。[Effects of the Invention] According to the present invention described in detail above, by superposing and arranging a plurality of members having different X-ray absorption edges, an X A line shielding member can be provided.
第１図は本発明の第１の実施例を示す断面図、第２図は
第１図に示すＸ線遮蔽部材を構成する鉛及びタングステ
ンのに吸収端を示す特性図、第３図（ａ）は本発明の第
２の実施例を示す断面図、第３図（ｂ）は第３図（ａ）
に示すＸ線遮蔽部材を構成する鉛及びモリブデンのに吸
収端を示す特性図、第４図（ａ）は本発明の第３の実施
例を示す断面図、第４図（ｂ）は第４図（ａ）に示すＸ
線遮蔽部材を構成するタングステン及びモリブデンのに
吸収端を示す特性図、第５図（ａ）は鉛を用いて構成し
た従来のＸ線遮蔽部材を示す断面図、第５図（ｂ＞は鉛
のに吸収端を示す特性図である。
１・・・Ｘ線遮蔽部材、２Ａ・・・第１の部材、２Ｂ・
・・第２の部材。FIG. 1 is a sectional view showing the first embodiment of the present invention, FIG. 2 is a characteristic diagram showing the absorption edge of lead and tungsten constituting the X-ray shielding member shown in FIG. ) is a sectional view showing the second embodiment of the present invention, and FIG. 3(b) is a sectional view of FIG. 3(a).
4(a) is a sectional view showing the third embodiment of the present invention, and FIG. 4(b) is a sectional view showing the absorption edge of lead and molybdenum constituting the X-ray shielding member. X shown in figure (a)
A characteristic diagram showing the absorption edge of tungsten and molybdenum that constitute the radiation shielding member. Figure 5 (a) is a cross-sectional view showing a conventional X-ray shielding member constructed using lead. It is a characteristic diagram showing an absorption edge in 1... X-ray shielding member, 2A... first member, 2B...
...Second member.
Claims (4)
おいて、異なるＸ線吸収端を有する複数の部材を重合配
置することにより構成したことを特徴とするＸ線遮蔽部
材。(1) An X-ray shielding member for shielding X-rays from an X-ray generation source, characterized in that the X-ray shielding member is constructed by overlapping and arranging a plurality of members having different X-ray absorption edges.
の部材との組合せである特許請求の範囲第１項記載のＸ
線遮蔽部材。(2) X according to claim 1, wherein the plurality of members are a combination of a lead member and a dungsten member.
Line shielding member.
部材との組合せである特許請求の範囲第１項記載のＸ線
遮蔽部材。(3) The X-ray shielding member according to claim 1, wherein the plurality of members are a combination of a lead member and a molybdenum member.
リブデン製の部材の組合せである特許請求の範囲第１項
記載のＸ線遮蔽部材。(4) The X-ray shielding member according to claim 1, wherein the plurality of members are a combination of a tungsten member and a molybdenum member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20590986A JPS6361999A (en) | 1986-09-03 | 1986-09-03 | X-ray shielding member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20590986A JPS6361999A (en) | 1986-09-03 | 1986-09-03 | X-ray shielding member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6361999A true JPS6361999A (en) | 1988-03-18 |
Family
ID=16514759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20590986A Pending JPS6361999A (en) | 1986-09-03 | 1986-09-03 | X-ray shielding member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6361999A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0370812A2 (en) * | 1988-11-25 | 1990-05-30 | Du Pont Canada Inc. | Method of fractional attenuation of electromagnetic radiation |
| JPH0862388A (en) * | 1994-08-26 | 1996-03-08 | Dainippon Printing Co Ltd | X-ray shielding laminated body |
| EP0739017A1 (en) * | 1995-04-20 | 1996-10-23 | NIHON MEDI-PHYSICS Co., Ltd. | Shielding member for radioactive substance, manufacturing method for the shielding member and apparatus for producing radioactive solution |
| JP2001273998A (en) * | 2000-01-26 | 2001-10-05 | Varian Medical Systems Inc | X-ray tube and its manufacturing method |
| JP2018105681A (en) * | 2016-12-26 | 2018-07-05 | 住友電気工業株式会社 | Radiation shielding plate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62100699A (en) * | 1984-11-05 | 1987-05-11 | ペーテル テレキ | Structure for shielding x-ray and gamma ray |
-
1986
- 1986-09-03 JP JP20590986A patent/JPS6361999A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62100699A (en) * | 1984-11-05 | 1987-05-11 | ペーテル テレキ | Structure for shielding x-ray and gamma ray |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0370812A2 (en) * | 1988-11-25 | 1990-05-30 | Du Pont Canada Inc. | Method of fractional attenuation of electromagnetic radiation |
| EP0370812A3 (en) * | 1988-11-25 | 1990-08-29 | Du Pont Canada Inc. | Method of fractional attenuation of electromagnetic radiation |
| JPH0862388A (en) * | 1994-08-26 | 1996-03-08 | Dainippon Printing Co Ltd | X-ray shielding laminated body |
| EP0739017A1 (en) * | 1995-04-20 | 1996-10-23 | NIHON MEDI-PHYSICS Co., Ltd. | Shielding member for radioactive substance, manufacturing method for the shielding member and apparatus for producing radioactive solution |
| US5831271A (en) * | 1995-04-20 | 1998-11-03 | Nihon Medi-Physics Co., Ltd. | Shielding member for radioactive substance, manufacturing method for the shielding member and apparatus for producing radioactive solution |
| JP2001273998A (en) * | 2000-01-26 | 2001-10-05 | Varian Medical Systems Inc | X-ray tube and its manufacturing method |
| JP2018105681A (en) * | 2016-12-26 | 2018-07-05 | 住友電気工業株式会社 | Radiation shielding plate |
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