由买买提看人间百态

boards

本页内容为未名空间相应帖子的节选和存档,一周内的贴子最多显示50字,超过一周显示500字 访问原贴
Salon版 - 谣言止于公信: 李大同
相关主题
河南杞县民众受钴60泄漏传言影响大量外迁开封杞县发生钴60泄露事件 (转载)
张鸣:政府不作为是谣言满天的罪魁(转载)不开心,老板让我用p32做实验
李大同:弱智的庆典(转载)路透的报道,4号的辐照燃料贮存池火灭了?
政府失去公信力以后,任何事情做起来都难度倍增。今天买了一个大大的日本红薯
政府开发别墅 公信荡然无存实验室有人要做p32, 我怀孕4个月,能在实验室么?
广东钴泄漏持续48天没公开 传公务员悄悄搬家西海岸的同学,这几天下雨一定要撑伞啊
南方系又来了,中国拥有上万放射源 安全隐患至今犹存Worst case by Dr. Allen, >Chernobyl
中国民用放射源成可怕杀手 如何防范已迫在眉睫2号炉的积水放射性已经是正常的10 million 倍了ZZ
相关话题的讨论汇总
话题: beta话题: cobalt话题: 李大同话题: chinese
进入Salon版参与讨论
1 (共1页)
c**i
发帖数: 6973
1
李大同, 点评中国: 谣言止于公信. BBC Chinese, July 27, 2009.
http://news.bbc.co.uk/chinese/simp/hi/newsid_8170000/newsid_8170700/8170799.stm
My comment:
(a) The commentary started with “我们小时候都读过《咕咚来了》的童话.”
(b) Cobalt-60 creates beta decay. Beta particles can be stopped by a sheet
of aluminum that is 2 to 3 mm thick. Perhaps because the author, Mr. 李大同,
was starved of information--Chinese government has said little about the
incident—his commentary states, “6月14日15时,辐照室内接受辐照加工的辣椒粉
由于放射源的长时间照射,温度过高自燃。” Beta rad
d****d
发帖数: 2919
2
瞎说,钴60明显是gamma源

同,
瞎说,钴60明显是gamma源
cause

【在 c**i 的大作中提到】
: 李大同, 点评中国: 谣言止于公信. BBC Chinese, July 27, 2009.
: http://news.bbc.co.uk/chinese/simp/hi/newsid_8170000/newsid_8170700/8170799.stm
: My comment:
: (a) The commentary started with “我们小时候都读过《咕咚来了》的童话.”
: (b) Cobalt-60 creates beta decay. Beta particles can be stopped by a sheet
: of aluminum that is 2 to 3 mm thick. Perhaps because the author, Mr. 李大同,
: was starved of information--Chinese government has said little about the
: incident—his commentary states, “6月14日15时,辐照室内接受辐照加工的辣椒粉
: 由于放射源的长时间照射,温度过高自燃。” Beta rad

c**i
发帖数: 6973
3
I did double check.
Anyway, gamma ray can be stopped with a thick wall.

【在 d****d 的大作中提到】
: 瞎说,钴60明显是gamma源
:
: 同,
: 瞎说,钴60明显是gamma源
: cause

i**n
发帖数: 1436
4
废话,关键是问题是铅版有多厚。有个词叫做shielding。还来个词叫做stopped,
holly cow! why somebody refuses to be a chinese while uses chinglish?

【在 c**i 的大作中提到】
: I did double check.
: Anyway, gamma ray can be stopped with a thick wall.

d****d
发帖数: 2919
5
你哪儿check的?
别告诉我这种东西都到wiki上去check。。。
直接告诉你吧,钴60到镍60确实是beta decay,
不过它作为放射源的主要应用就是那两个gamma。。
至于beta么,别说你前面说的用铝薄,空气就把它干掉了。。

【在 c**i 的大作中提到】
: I did double check.
: Anyway, gamma ray can be stopped with a thick wall.

d****d
发帖数: 2919
6
这个又是直接拿墙shielding掉了就完了。。。
否则就没有放射性危害这么一会事了。
放射性对公众的危害主要是反射性沾染,就是放射物质粉末泄露,通过水源,食物直接
进入人体,甚至被呼吸进去,造成长期伤害。
这个你怎么shielding?
btw,相比alpha和beta,gamma辐射的伤害微乎其微。

【在 i**n 的大作中提到】
: 废话,关键是问题是铅版有多厚。有个词叫做shielding。还来个词叫做stopped,
: holly cow! why somebody refuses to be a chinese while uses chinglish?

c**i
发帖数: 6973
7
(1) I was assuming that Chinese in the county realized that the radioactive
source was Cobalt-60, emitted beta particles and confined inside a building.
Therefore, radioactive dusts were not an issue.
(2) Then, radiation from the cobalt-60 could not travel far.
FAQs About Radiation Protection
http://www.nrc.gov/about-nrc/radiation/related-info/faq.html
("Alpha and beta particles do not travel far at all, and they are easily
blocked.")
(3) I cannot find argument for or against your statement that

【在 d****d 的大作中提到】
: 这个又是直接拿墙shielding掉了就完了。。。
: 否则就没有放射性危害这么一会事了。
: 放射性对公众的危害主要是反射性沾染,就是放射物质粉末泄露,通过水源,食物直接
: 进入人体,甚至被呼吸进去,造成长期伤害。
: 这个你怎么shielding?
: btw,相比alpha和beta,gamma辐射的伤害微乎其微。

d****d
发帖数: 2919
8
算了吧,钴60是典型的gamma源都不知道,还beta beta的。。

radioactive
building.

【在 c**i 的大作中提到】
: (1) I was assuming that Chinese in the county realized that the radioactive
: source was Cobalt-60, emitted beta particles and confined inside a building.
: Therefore, radioactive dusts were not an issue.
: (2) Then, radiation from the cobalt-60 could not travel far.
: FAQs About Radiation Protection
: http://www.nrc.gov/about-nrc/radiation/related-info/faq.html
: ("Alpha and beta particles do not travel far at all, and they are easily
: blocked.")
: (3) I cannot find argument for or against your statement that

c**i
发帖数: 6973
9
All of the following is for the reference of "dumand" in his various
postings. I trust the issues may now be laid to rest.
(1) Co-60. EPA (US).
http://www.epa.gov/rpdweb00/radionuclides/cobalt.html
Quote:
(a) "Cobalt (including cobalt-60) is a hard, brittle, gray metal with a
bluish tint. It is solid under normal conditions and is generally similar to
iron and nickel in its properties. In particular, cobalt, like iron, can be
magnetized.
(b) "Cobalt-60 undergoes radioactive decay with the emissi

【在 d****d 的大作中提到】
: 算了吧,钴60是典型的gamma源都不知道,还beta beta的。。
:
: radioactive
: building.

d****d
发帖数: 2919
10
so ?

to
be

【在 c**i 的大作中提到】
: All of the following is for the reference of "dumand" in his various
: postings. I trust the issues may now be laid to rest.
: (1) Co-60. EPA (US).
: http://www.epa.gov/rpdweb00/radionuclides/cobalt.html
: Quote:
: (a) "Cobalt (including cobalt-60) is a hard, brittle, gray metal with a
: bluish tint. It is solid under normal conditions and is generally similar to
: iron and nickel in its properties. In particular, cobalt, like iron, can be
: magnetized.
: (b) "Cobalt-60 undergoes radioactive decay with the emissi

1 (共1页)
进入Salon版参与讨论
相关主题
2号炉的积水放射性已经是正常的10 million 倍了ZZ政府开发别墅 公信荡然无存
为什么全世界对日本随地大小便那么宽容啊???广东钴泄漏持续48天没公开 传公务员悄悄搬家
Radioactive cars from Japan arrive in Chilean port南方系又来了,中国拥有上万放射源 安全隐患至今犹存
How do you think house with Radon remediation system中国民用放射源成可怕杀手 如何防范已迫在眉睫
河南杞县民众受钴60泄漏传言影响大量外迁开封杞县发生钴60泄露事件 (转载)
张鸣:政府不作为是谣言满天的罪魁(转载)不开心,老板让我用p32做实验
李大同:弱智的庆典(转载)路透的报道,4号的辐照燃料贮存池火灭了?
政府失去公信力以后,任何事情做起来都难度倍增。今天买了一个大大的日本红薯
相关话题的讨论汇总
话题: beta话题: cobalt话题: 李大同话题: chinese