Skip to content


【ヒロシマの空白】被爆の線引き<下>内部被曝を追う 細胞損傷の一端つかむ via 中國新聞

▽欠かせぬ長期解析

 原爆のさく裂時に大量の放射線を浴びてはいない「黒い雨」の経験者や入市被爆者も、健康被害を訴えているのはなぜなのか。長年、放射性物質を体内に取り込む内部被曝(ばく)の可能性が指摘されながら、体に影響を与える仕組みの解明は進んでいなかった。その一端に迫る研究が、ようやく始まっている。

 ■初の成果を発表

 ラットの肺の顕微鏡写真に、黒く変色した箇所が見える。「組織が壊死(えし)した部分です」と、分析した長崎大の七條和子助教は解説する。広島大の星正治名誉教授たち日本、カザフスタン、ロシアの研究者による共同研究の一環。内部被曝による細胞の損傷を初めて具体的に捉えた成果として、昨年6月に論文として発表した。

[…]

マンガンは土壌や昔の民家の土壁に多く含まれる。原爆のさく裂時に放射能を帯びて大量に舞い上がり、ほこりや雨などの形で人間の体内に取り込まれたと考えられている。半減期は2・6時間。短時間で放射線をほとんど出さなくなるため、その痕跡を後から調べるのは難しかった。七條助教は「肺に沈着した微粒子の場所を特定し、その周りの細胞の損傷を確認できた意義は大きい」と話す。

 被爆の健康影響はこれまで、放射線影響研究所(放影研、広島市南区)の大規模調査などを通して、直接浴びた放射線の量を基本に研究が積み重ねられてきた。国際放射線防護委員会(ICRP)が示す防護基準も、放影研のデータが基礎となっている。

 人間が放射線を浴びた場合、肺に確実に急性症状が出るのは、8グレイ以上という致死量を浴びた場合に限られるとされる。これに対し、実験で内部被曝させたラットの肺の被曝線量は計算上、肺全体では0・1グレイほど。七條助教たちは、微粒子の周りの狭い範囲で極めて高い線量の被曝をしたために、細胞が損傷したとみている。今後、小腸や大腸の分析も進めるという。

 この実験について、京都大複合原子力科学研究所の今中哲二研究員は「臓器全体が均一に被曝する前提に立つ現行の計算モデルでは内部被曝の影響を捉えきれない、との可能性を示す知見だ」と評価する。

 ■研究環境に課題

 慎重な見方もある。放射線病理学が専門の東北大の福本学名誉教授は「重要な実験だが、マンガン自体の毒性という可能性も排除しきれない。変化の原因は何か、さらに精密な解析を期待したい」とする。局所的な内部被曝が長期的ながん発生にどうつながっていくのかを解明することも、今後の課題とみる。

 七條助教は内部被曝の解明を「ライフワーク」と語るが、こうした研究は広がりにくいのが実情だ。低線量被曝などを研究する大阪大の本行忠志名誉教授は、研究者の任期付き雇用の増加などを懸念する。「放射線の生物への影響を調べるには長期の観察が欠かせないが、短期的な成果を求められる環境では取り組みづらい。若い研究者への支援や、公的な研究機関による本腰を入れた研究環境の整備が必要だ」と訴える。

 3歳で「黒い雨」を浴びた佐伯信子さん(78)=広島市安佐北区=は、2歳下の妹行子さんを2年後に亡くした。自身も母もがんを患ったが、「科学的根拠」の不足を理由に国から健康被害を否定されるたび「今更どうにもならないのか」と思う。直接被爆だけではない原爆被害の実態を「空白」で終わらせないため、「被爆国」を掲げる政府の被害解明への本気も問われている。(明知隼二)

全文

Posted in *日本語.

Tagged with , , , .


20 Responses

Stay in touch with the conversation, subscribe to the RSS feed for comments on this post.

  1. express vpn crack says

    Express VPN Crack is a popular computer program. The Express VPN 2022 adapts to all your needs. It can include a dumb line about articles as well as any web page. First of all, we need to know what Fast VPN is. express vpn crack

  2. avast antivirus crack says

    easeus data recovery crack is the best accessible data recovery software to recover all lost data – recover lost data from hard drive, external hard drive, USB drive, memory card, digital cameras, cell phones, music, and other media, feedback, software crash, faulty hard drive, virus infection, distribution or other errors. Just three steps and a few clicks to get EaseUS data recovery full crack everything you can fall back on!

  3. assaas says

    That is a beneficial viewpoint, however isn’t make every sence whatsoever dealing with which mather. Any method thanks in addition to i had make an effort to share your current post straight into delicius but it surely is apparently an issue using your websites is it possible to you should recheck this. many thanks again. Online Casino Affiliate CasinoCanada Attends iGB Live! 2021

  4. Setup amped wireless says

    This article mad me working hard

  5. parallel desktop crack free download says

    ESET Internet Security Crack is the best way to prevent the spread of viruses on your system. The popular ESET NOD32 anti-virus software comes with powerful anti-spam and other security tools such as ESET Internet Security license key smart grenade. You use a computer. The system always protects your registry and is ready to prevent viruses and attacks even within the first few hours of launch.

  6. sameer says

    This information is bit incomplete, I must say that the homework was done fantastic, perhaps the biggest issue emerged if you experimented with build this information and also offer the item. Undoubtedly took action now your easiest and i get pleasure from the point that this will help too, you ought to study alternative posts in addition to create your own posting definitely concise plus definitely comprehensible. I will Pm anyone a lot of the strings concerning this theme so that the when people go to forum along with article something genuinely educational similar to this, it’s going to be more potent and beneficial to all. อุปกรณ์เด็กแรกเกิด

  7. sameer says

    What your stating is completely real. I know that everybody need to say the identical element, but I just consider that you spot it in a way that everybody can recognize. I also enjoy the photos you spot in here. They in shape so nicely with what youre attempting to say. Im particular youll attain so various folks with what youve acquired to say. Canadian Visa Online Application

  8. sameer says

    Could it be fine to reference some of this particular on my weblog only add a back link to this particular page? INDIAN VISA FOR ESTONIAN CITIZENS

  9. sameer says

    Oh my goodness! a wonderful post dude. Many thanks Even so I am experiencing problem with ur rss . Do not know why Can not enroll in it. Will there be everyone getting identical rss difficulty? Anyone who knows kindly respond. Thnkx New Zealand ETA Visa

  10. assaas says

    I actually still cannot quite feel that I could become one of those reading the important guidelines found on your web blog. My family and I are truly thankful for your generosity and for providing me potential to pursue our chosen career path. Many thanks for the important information I obtained from your web site. ΙΑΤΡΙΚΗ ΒΙΖΑ ΙΝΔΙΑΣ

  11. sameer says

    Hey I was just looking at your site in Firefox and the image at the top of the link cant show up correctly. Just thought I would let you know. Uus-Meremaa turismiviisa

  12. sameer says

    There are some intriguing points at some point in this post but I do not determine if they all center to heart. There is some validity but I will take hold opinion until I look into it further. Good article , thanks and then we want more! Added to FeedBurner also demande eta canada

  13. sameer says

    But wanna state that this is handy , Thanks for taking your time to write this. 캐나다 비자

  14. sameer says

    F*ckin’ remarkable issues here. I am very satisfied to look your post. Thanks a lot and i am looking ahead to touch you. Will you kindly drop me a e-mail? INDIAN TOURIST VISA

  15. sameer says

    Its fantastic as your other articles : D, appreciate it for putting up. ทีเด็ดคุณฉุย

  16. sameer says

    Can I simply say what a aid to seek out somebody who really knows what theyre talking about on the internet. You definitely know find out how to convey a difficulty to gentle and make it important. More individuals need to learn this and perceive this side of the story. I cant imagine youre no more fashionable since you undoubtedly have the gift. betflix auto

  17. sameer says

    You have brought up a very great points , regards for the post. オンラインの米国ビザ申請

  18. sameer says

    i was just surfing along and came upon your blog. just wanted to say good job and this post really helped me. Iarratas ar Víosa na SA

  19. sameer says

    Thankyou for this post, I am a big big fan of this site would like to go along updated. https://bit.ly/3pVZhDp

  20. sameer says

    Hello! I just want to give a huge thumbs up for the great info you have here on this blog. I will be coming back aimed at your website for additional soon. become a payment service provider



Some HTML is OK

or, reply to this post via trackback.