JPH0441681U - - Google Patents
Info
- Publication number
- JPH0441681U JPH0441681U JP8162090U JP8162090U JPH0441681U JP H0441681 U JPH0441681 U JP H0441681U JP 8162090 U JP8162090 U JP 8162090U JP 8162090 U JP8162090 U JP 8162090U JP H0441681 U JPH0441681 U JP H0441681U
- Authority
- JP
- Japan
- Prior art keywords
- count value
- calculates
- air
- semiconductor detector
- radioactive substances
- 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
- 239000004065 semiconductor Substances 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000941 radioactive substance Substances 0.000 claims 3
- 238000001514 detection method Methods 0.000 claims 2
- 230000005251 gamma ray Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
Description
第１図ａ，ｂは、本考案に係る半導体検出器を
用いたダストモニタの概略構成図、第２図は、第
１図に示すダストモニタの測定部の回路ブロツク
図、第３図は、測定部のＳＣＡで計数されるエネ
ルギ分布を示した説明図である。
１２……電気冷却装置、１４……測定部、１４
ｂ……ＧＲＯＳＳ計数用ＳＣＡ、１４ｃ……ＢＫ
Ｇ計数用ＳＣＡ、１４ｄ……ＮＥＴ計数率計、１
４ｅ……記録計、１６……長尺濾紙部、１８……
半導体検出器、１９……クライオスタツト、２０
……コントロール回路。
1a and 1b are schematic configuration diagrams of a dust monitor using a semiconductor detector according to the present invention, FIG. 2 is a circuit block diagram of the measurement section of the dust monitor shown in FIG. 1, and FIG. It is an explanatory view showing energy distribution counted by SCA of a measurement part. 12...Electric cooling device, 14...Measuring unit, 14
b...SCA for GROSS counting, 14c...BK
G counting SCA, 14d...NET counting rate meter, 1
4e... Recorder, 16... Long filter paper section, 18...
Semiconductor detector, 19... Cryostat, 20
...control circuit.
Claims (1)
中の放射能濃度を測定するダストモニタにおいて
、 前記濾紙に集塵された放射性物質からのγ線を
検出し、そのγ線のエネルギーに応じた検出信号
を出力する冷却型の半導体検出器と、 前記半導体検出器を連続して冷却する電気冷却
装置と、 前記半導体検出器から出力される検出信号を入
力して、全体計数値とバツクグラウンド計数値と
を求め、両計数値から正味計数値を算出する計数
値演算装置と、を有し、 前記正味計数値から空気中の放射性物質の濃度
を求めることを特徴とするダストモニタ。[Claim for Utility Model Registration] In a dust monitor that measures radioactivity concentration in the air by collecting radioactive substances in the air on a filter paper, detecting γ rays from the radioactive substances collected on the filter paper. and a cooling-type semiconductor detector that outputs a detection signal according to the energy of the γ-ray; an electric cooling device that continuously cools the semiconductor detector; and an electric cooling device that inputs the detection signal output from the semiconductor detector. and a count calculation device that calculates an overall count value and a background count value, and calculates a net count value from both count values, and calculates the concentration of radioactive substances in the air from the net count value. A dust monitor featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8162090U JPH0441681U (en) | 1990-07-31 | 1990-07-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8162090U JPH0441681U (en) | 1990-07-31 | 1990-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0441681U true JPH0441681U (en) | 1992-04-08 |
Family
ID=31627717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8162090U Pending JPH0441681U (en) | 1990-07-31 | 1990-07-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0441681U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007225416A (en) * | 2006-02-23 | 2007-09-06 | Mitsubishi Electric Corp | Radioactive gas monitor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52104281A (en) * | 1976-02-27 | 1977-09-01 | Hitachi Ltd | U isotope ratio meter |
| JPS5913968A (en) * | 1982-07-15 | 1984-01-24 | Mitsubishi Electric Corp | Device for measuring radioactivity in water |
| JPS636374B2 (en) * | 1983-03-01 | 1988-02-09 | Norihisa Kataoka |
-
1990
- 1990-07-31 JP JP8162090U patent/JPH0441681U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52104281A (en) * | 1976-02-27 | 1977-09-01 | Hitachi Ltd | U isotope ratio meter |
| JPS5913968A (en) * | 1982-07-15 | 1984-01-24 | Mitsubishi Electric Corp | Device for measuring radioactivity in water |
| JPS636374B2 (en) * | 1983-03-01 | 1988-02-09 | Norihisa Kataoka |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007225416A (en) * | 2006-02-23 | 2007-09-06 | Mitsubishi Electric Corp | Radioactive gas monitor |
| JP4536668B2 (en) * | 2006-02-23 | 2010-09-01 | 三菱電機株式会社 | Radioactive gas monitor |
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