パソコンに向かっているとついつい仕事してしまうので、出かけたいと思う午前中。昼過ぎてやっと、〈非戦を選ぶ演劇人の会〉で購入したガイガーカウンターを相馬くんから受けとるため、出かける。下北沢駅南口のマクドナルド3階のテーブル上は0.08マイクロシーベルト/h。ベータ線とガンマ線を測ることができる機械だが、アルミ板でベータ線を遮断してガンマ線だけ（空間線量のみ）の計測結果。一年間で700マイクロシーベルト程度になるという計算。セシウムはガンマ線ベータ線両方を出しているが、板を外して両方混じった数値を計ると、とんでもなく高く出てしまう時もあるという。複数の人から説明書をよく読むようにという助言をもらっていたが、まあ、ややこしい表示が別欄に出てくるが、その場の結果がわかればいいという意味ではシンプル。こういう機械は数値そのものは信用するなとも言われている。数値には誤差はあり得るが、同一箇所での「変化」そのものを定期的に確かめるには適しているということらしい。あと、地面に置く時は放射性物質があやまって付着しないようにジップロックに機械を入れなければならない。単4電池2本で、10時間（GPS機能を使うと3時間）稼働する。その後行った根津神社の、漱石『道草』に出てくる黒い平べったい石の辺りでは０．１４マイクロシーベルト/h。井の頭線某駅の駅前駐車場０．１０マイクロシーベルト/h。私の自宅近辺は０．０９マイクロシーベルト/h。自宅屋内が０．０７～８マイクロシーベルト/hと、若干減る。機械の音に気づいた息子が起きてきて、ガイガーカウンターだと教えると、「だと思った」。こんな機械を借りてきていろいろテストするなんて、ほんとうに、一年前には考えられないことをしている。
Geiger counter
I would rather go out than sitting in front of my computer in the morning since I tend to keep working and forget about the time passing.
In the afternoon, at last I went out to receive a Geiger counter from Aiba-kun, which HISEN WO ERABU ENGEKI JIN NO KAI (Theater people who determine no more war) purchased. On the table, on the third floor of MacDonald at the south exit of Shimokitazawa station, the place is exposed to an estimated 0.08 micro sieverts of radiation. The device can measure both beta dose and gamma dose. This time, shutting out the beta-ray by using aluminum board and measured only gamma-ray.
In total, it will be accumulated to 700 micro sieverts after one year. Cesium gives off both gamma-ray and beta-ray and sometimes, the dose becomes extremely high, removing the aluminum board and two rays are mixed up. Many people advised me to read the explanation carefully and it's true that very complicated notifications are appeared on the device. However, I can say that the device is simple since the results can be seen instantly. Some say that we should not believe the results by these kinds of devices. Even so, admitting that the results have a margin of error, it is suitable to check the radiation level at the same place on a regular basis.
One more thing to be careful is that the device should be in a ziplock or a plastic bag, lest radiative materials should put on the device accidentally. It is available for 10 hours using two triple A batteries ( if you use a GPS location service, available only for three hours). Later on the day, 0.14 micro sieverts / h was measured around a black flat stone at Nezu shrine, which is famous in the novel written by Soseki Natsume. At the parking area in front of some station of Inokashira line, the measured dose was 0.10 micro sieverts/ h. Around my house, it was 0.09 micro sieverts / h. At the inside of my house, it was 0.07-0.08 <x-apple-data-detectors://0> micro sieverts/ h, which is lower a little compared with the outside. My son woke up by the sound of the machine and I told him what it was. He said, "I knew it". If it was one year ago, I never knew that I came to check the radiation dose by using such a device.
Geiger counter
I would rather go out than sitting in front of my computer in the morning since I tend to keep working and forget about the time passing.
In the afternoon, at last I went out to receive a Geiger counter from Aiba-kun, which HISEN WO ERABU ENGEKI JIN NO KAI (Theater people who determine no more war) purchased. On the table, on the third floor of MacDonald at the south exit of Shimokitazawa station, the place is exposed to an estimated 0.08 micro sieverts of radiation. The device can measure both beta dose and gamma dose. This time, shutting out the beta-ray by using aluminum board and measured only gamma-ray.
In total, it will be accumulated to 700 micro sieverts after one year. Cesium gives off both gamma-ray and beta-ray and sometimes, the dose becomes extremely high, removing the aluminum board and two rays are mixed up. Many people advised me to read the explanation carefully and it's true that very complicated notifications are appeared on the device. However, I can say that the device is simple since the results can be seen instantly. Some say that we should not believe the results by these kinds of devices. Even so, admitting that the results have a margin of error, it is suitable to check the radiation level at the same place on a regular basis.
One more thing to be careful is that the device should be in a ziplock or a plastic bag, lest radiative materials should put on the device accidentally. It is available for 10 hours using two triple A batteries ( if you use a GPS location service, available only for three hours). Later on the day, 0.14 micro sieverts / h was measured around a black flat stone at Nezu shrine, which is famous in the novel written by Soseki Natsume. At the parking area in front of some station of Inokashira line, the measured dose was 0.10 micro sieverts/ h. Around my house, it was 0.09 micro sieverts / h. At the inside of my house, it was 0.07-0.08 <x-apple-data-detectors://0> micro sieverts/ h, which is lower a little compared with the outside. My son woke up by the sound of the machine and I told him what it was. He said, "I knew it". If it was one year ago, I never knew that I came to check the radiation dose by using such a device.
※コメント投稿者のブログIDはブログ作成者のみに通知されます