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Reply #17: Live webcam Tokyo geiger counter link... [View All]

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GReedDiamond Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Mar-14-11 10:41 PM
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17. Live webcam Tokyo geiger counter link...
...somebody else here at DU posted this yesterday, I don't have a link to the original post.

But here's the link to the webcam:

http://www.ustream.tv/channel/geiger-counter-tokyo

As I understand this, 10-20 CPM is normal background radiation for Tokyo, so the current readings, in the 13-13.5 range as I post this, are still normal.

I'm particularly concerned about this, as my girlfriend, who was supposed to have returned home to Los Angeles last Saturday, is currently stuck in Tokyo at this time.

Below is the explanation of this web cam setup, I have emboldened the pertinent section regarding normal background radiation levels for Tokyo, and followed the original Japanese with the Google translation:

東京江東区の屋内で稼働しているガイガーカウンタをうつしています。単位は CPM<1分あたりのカウント量>ですが、(起動してからのカウント数)÷(起動してからの時間) で計算されているので、長時間動いている時には値が動きにくくなります。また、この数値のみで影響を測ることはできませんので、あくまで一つの"目安"としてご参照下さい。尚、音声はありません。

使用しているガイガーカウンタは以下の自作キットです。
http://strawberry-linux.com/catalog/items?code=53001
学習・実験用途に販売されているキットを元に素人が作成した機器であり、当然、プロ用の機材ではありませんので、正確性には欠けるとお考えください。
併せて以下のような公的データも参照ください。
http://www.houshasen-pref-ibaraki.jp/present/result01.html
http://www.k4.dion.ne.jp/~ngtl-rad/
http://gensiryoku.pref.aomori.lg.jp/atom/

普段は概ね10~20CPM程度です。
下の時間はカウンタが起動してからの時間を示します。PCの電源と連携しているので、PCが再起動したりするとリセットされます。起動してから間もない間は極端な値が出ることもあります。


※一般のPC環境ですので、停電、フリーズや回線の不調で切断されることがあります。昼間・深夜帯では復旧に時間がかかることもありますが、ご了承下さい。

Google translation:
She sees the Gaigakaunta is running indoors in Koto Ward, Tokyo. The unit is CPM , but (count from the start) ÷ (time from the start), so that is calculated when running long and difficult to move the value Masu. Also, these figures measure only the effect can not be, strictly a "measure" Please refer to as. In addition, there is no sound.

Gaigakaunta do-it-yourself kit to use is below.
http://strawberry-linux.com/catalog/items?code=53001
Equipment and kits based amateurs have created has been sold to use the learning experiment, of course, the equipment is not so professional, you think the lack of accuracy, please.
Please also see the following public data together.
http://www.houshasen-pref-ibaraki.jp/present/result01.html
http://www.k4.dion.ne.jp/ ~ ngtl-rad /
http://gensiryoku.pref.aomori.lg.jp/atom/

It is usually about 10 ~ 20CPM generally.
Time indicates the time from the bottom to start the counter. Because it works with PC power, PC is reset or when you reboot. Not long after starting between the extreme values ​​may appear.


※ PC environment because it is a general power outage, a malfunction may be cut or freeze line. But may take longer to recover in the late night the day, please understand.
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