d*b
发帖数: 21830 | 1 前几年NRC发现的一个accident就是，某公司招了个女人做radiation worker, 例行尿
检做liquid scintillation counting发现残留的Tritium,然后查她小孩和男人，发现
都有trace,最后调查employment history发现10年前在某公司接触过Tritium.
Tritium事故是RSO最不愿意听到的，你一个大学的nuclear chemistry lab要发生
Tritium污染事故的话，这个lab那之整层楼都只能封存了。Tritium的decay energy非
常低，一般的仪器都没法测，但能量低，biological half life短并不等于危害小，
Tritium这玩意属于internal dosimetry, 跟传统的dosimetry不一样。你说1MeV的
electron和0.02MeV的electron,对DNA那个危害更大？
建议你找Cember的书去学习学习。 |
|
T*R
发帖数: 36302 | 2 Filed under Energy
Exelon probing shutdown of Braidwood reactors
By Julie Wernau
Posted Aug. 16, 2010 at 12:39 p.m.
Exelon Corp. is investigating the cause of shutdowns this morning of two
nuclear reactors at Braidwood Generating Station.
The Unit 2 turbine tripped off line at 2:06 a.m., followed 13 minutes later
by a shutdown of the Unit 1 reactor.
Nuclear Regulatory Commission spokeswoman Prema Chandrathil said in the case
of Unit 2, there was a problem with the path of the electrical current,... 阅读全帖 |
|
d*b
发帖数: 21830 | 3 安了，tritium衰变产生的电子能量很低，不能透过皮肤，一般不会对人体构成影响，
乌克兰切尔诺贝利核电站事故后的tritium brun主要是消防员，这些人burn的主要原因
是衣服吸水造成大量tritium驻留在皮肤表面。radiation safty一般不认为tritium是
个危险。
即使乌克兰切尔诺贝利核电站事故，主要的影响是儿童的甲状腺癌，而这些影响来源也
不是direct radiation,是因为政治原因切尔诺贝利核电站地区的农产品没有被禁止流
通，这些儿童吃了这些农产品后产生的二次污染造成的。
乌克兰这么大的事故，才伤160多，死20多，现在日本的跟当年乌克兰的完全不是一会
事。
later
case |
|
B******1
发帖数: 9094 | 4 School homework for a 7th grader: An Essay about Scientific Research and Its
Impact
- - - - - - -
Pave the Way for the Future
A few years ago while watching a documentary by Al Gore, I first heard of
global warming. We were living in San Diego, CA at the time. As you can
imagine, the idea of Southern California disappearing due to a rising sea
level was absolutely horrible to me. Global warming has started popping up
in the news more and more often since then. The culprit might be the
consumpt... 阅读全帖 |
|
d*b
发帖数: 21830 | 5 搞笑，tritium是常见的isotope里面最危险的玩意了，internal dosimetry复杂，防护
极其复杂，带2层latex手套接触tritium，体内就能探测到残留。
跟重要的是，tritium decay energy太低，一般的geiger counter没用，需要闪烁计数
器才能用，而且一旦tritium进入体内，20年后都测得到残留。
。 |
|
d*b
发帖数: 21830 | 6 核武器用Tritium的可能性基本为0，Tritium这玩意只要母亲带着手套接触过一次，闪
烁计数器都能用孙子的血液里查出Tritium。这是个极端危险的放射源。 |
|
S****e
发帖数: 931 | 7 Fact Sheet: Increasing Plutonium Storage and Usage at Livermore
Lab Endangers the Bay Area and Central Valley
The Department of Energy (DOE) plans to double the administrative limit for
plutonium to 3,080 pounds, which is the amount that
can be housed in Livermore Lab's plutonium building. DOE also plans to
double the amount that can be used in a process or room
from 44 to 88 pounds. These plans, announced in the final Site Wide
Environmental Impact Statement (SWEIS) on Livermore Lab
operations,... 阅读全帖 |
|
k*****a
发帖数: 1463 | 8 This has been a rumor at best, it is based on the theory that boiling water
repeatedly causes Tritium (3H) based water molecules to stay while all other
Hydrogen atom boiled off. Heavy water (Tritium based, 2H is not radioactive) is health hazard.
It is a very difficult to get heavy water by boiling. The boiling point is
very close for heavy water and normal water.
2,500 ton water yields 2.5 kg Tritium water, which takes a dedicated
facility to generate in a year via different ways.
You should ... 阅读全帖 |
|
a***h
发帖数: 1222 | 9 实验中可以假定稳定流，那么流过一个pore volume的时间是稳定的，按照时间可以算
流过的pore volume。同时要量流出液的体积，根据discharge算实际流过的pore
volume。
假如是稳定流的话，按照mass (volume) 或者 time 来计算pore voluem 应该是一致的
。但是在实验的时候，如果样品粘土含量较高的话，在实验过程中会有膨胀，改变土壤
的饱和导水率和容积，所以流速会不稳定，这样按照时间测定和按照体积确定的pore
volume会不一样。如果使用沙子一般不会有这个问题。
Bromide做tracer是比较好的，实验中用tritium有时候会有些问题，虽然理论上
tritium应该是最合适的tracer. 我有时候用tritium会算出retardation = 1.3。很不
爽。
另外有一点，如果样品存在团聚体(aggregates)的话，用简单的ADE模拟会有问题，需
要用dual porosity 模型。
工程方面的研究总是用沙子来做土柱试验，一般不会有什么麻烦。可是如果用真正的土
壤或者地质样品的话，就会有许多意想不到的情况，也更难 |
|
c*****n
发帖数: 601 | 10 这么说shadow cliff的鱼是不是不能吃了？
http://www.trivalleycares.org/factSheet/Health_and_Environment.
【 以下文字转载自 SanFrancisco 讨论区 】
发信人: SFrose (黛娜), 信区: SanFrancisco
标 题: 弯曲Livermore 核试验室
发信站: BBS 未名空间站 (Wed Mar 16 15:52:40 2011, 美东)
Fact Sheet: Increasing Plutonium Storage and Usage at Livermore
Lab Endangers the Bay Area and Central Valley
The Department of Energy (DOE) plans to double the administrative limit for
plutonium to 3,080 pounds, which is the amount that
can be housed in Livermore Lab's pluton... 阅读全帖 |
|
m***a
发帖数: 13878 | 11 看名字不像是三哥
(Reuters) - Lockheed Martin Corp said on Wednesday it had made a
technological breakthrough in developing a power source based on nuclear
fusion, and the first reactors, small enough to fit on the back of a truck,
could be ready for use in a decade.
Tom McGuire, who heads the project, said he and a small team had been
working on fusion energy at Lockheed's secretive Skunk Works for about four
years, but were now going public to find potential partners in industry and
government for thei... 阅读全帖 |
|
d*b
发帖数: 21830 | 12 hydrogen是hydrogen, tritium是tritium。有点常识的人都不会弄错。 |
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m**********e
发帖数: 12525 | 13 美国人自己说的
因为氢弹需要Tritium作为primary的充填，Tritium半衰期只有12年，
所以氢弹的维护成本非常贵，每个几年就得重新充填
由于这个原因，核大国都不装备氢弹 |
|
d*****h
发帖数: 1266 | 14 I like C plus front Tritium and FO. Tritium for dark light, FO for bright light |
|
O*******e
发帖数: 6055 | 15 你是说用荧光漆涂的三点sight，还是Tritium night sight？
Tritium 也需要光源照一会才能亮吗？ |
|
o****n
发帖数: 1520 | 16 来自主题: GunsAndGears版 - H&K? 谢谢pmouse。
看了一个短视频，Factory Glow in the Dark Night Sights
http://www.youtube.com/watch?v=Lte4iHOERIE
“this is a review on HKs P30/HK45 factory glow in the dark night sights. to
get to the point, if you dont want to watch this, they are lame after 10
min :) and im still going to buy aftermarket tritium night sights :)
at 1min they where brighter then tritium night sights.
at 2min they where the same
at 5 they where dimmer
at 10 you could still see them
after that they where worthless but were still... 阅读全帖 |
|
b*****e
发帖数: 5133 | 17 Trijicon ACOG原来都是这么过来的。ACOG出名的一条揍是tritium + fiber optic不需
要电池。估计军队里用不到十年就该更新换代了，而tritium十二多年的半衰期后还能
凑合用，不至于变砖头滴。 |
|
S**********s
发帖数: 4534 | 18 跟aimpoint比起来， EOTECH很脆弱， 电池寿命也不行。
Aimpoint是真正的no-bullshit红点， 结实耐操， 埋土里， 泡水里， 开车压过去，
从直升机里扔出来， 用枪打， 用炸弹炸， 仍然工作。
http://www.youtube.com/watch?v=89HEefl1KI4
Trijicon是以他们提供给军队的4x ACOG出名的。 有的ACOG用聚光条不用电池， 白天
红点靠他发光， 晚上考tritium管。 tritium管有个寿命， 官方的说法是15年， 但老
一些的ACOG过了7,8年晚上就不亮了。
the |
|
f****t
发帖数: 15913 | 19 对，现在想想，LCR 357配一个tritium前瞄，其实最合适，近距离可以把tritium当红
点用了。 |
|
H****w
发帖数: 1632 | 20 How to Choose a Dive Watch For Scuba Diving
By Doodlebugs, eHow Member
Here are some things to look for when buying a dive watch.
.Difficulty: Easy
Instructions.1
If you are considering buying a SCUBA diving or dive watch here are some
important features you should look for.
The first and most important is resistance to water of course. Recreational
diving takes place down to a dept of 130 feet and a good dive watch should
be rated to at least 200 feet.
The higher the number of meters, feet, or ... 阅读全帖 |
|
M*V
发帖数: 3205 | 21 India plays key role in building super machine that will offer unlimited
energy
LONDON: India is developing the heaviest and the largest parts of the
Tokamak, the machine behind the biggest scientific collaboration on the
planet, to produce unlimited supplies of cheap, clean, safe and commercial
energy from atomic fusion.
The international nuclear fusion project known as ITER, meaning "the way" in
Latin, is based on the 'tokamak' concept of magnetic confinement, in which
the plasma is contained ... 阅读全帖 |
|
m****n
发帖数: 226 | 22 完蛋了，加拿大的核电站也出问题，2012真的来了，估计一个星期后美国也要糟，大家
逃命去吧。
Ontario Power Generation: Unplanned Water Release Not A Threat
DOW JONES NEWSWIRES
Ontario Power Generation Inc. (OPG.YY) said its nuclear power station in
Pickering, Ont. unintentionally released water into the environment on
Tuesday due to the failure of a pump seal.
In a statement posted on its website, the big electric utility, which is
owned by the province of Ontario, said the release was a "low level
regulatory event" and not a threat to publ... 阅读全帖 |
|
F****8
发帖数: 289 | 23 难道是Hydrogen-3 (tritium)？半衰期长达12年多。常用于样品标记，
biodistribution 活体实验。 |
|
d*b
发帖数: 21830 | 24 这个违反NRC的regulation和federal law 10CFR part 20了吧？ 用tritium是因为这个
要liquid scintillator才能测，一般海关只有GM detector。
recruitment |
|
c****g
发帖数: 37081 | 25 俺土，只听说D用在NMR跟踪，pk/pd用tritium，14C标记。要是能用D，谁没事蛋疼用T
？ |
|
y**********a
发帖数: 824 | 26 India plays key role in building super machine that will offer unlimited
energy
LONDON: India is developing the heaviest and the largest parts of the
Tokamak, the machine behind the biggest scientific collaboration on the
planet, to produce unlimited supplies of cheap, clean, safe and commercial
energy from atomic fusion.
The international nuclear fusion project known as ITER, meaning "the way" in
Latin, is based on the 'tokamak' concept of magnetic confinement, in which
the plasma is contained ... 阅读全帖 |
|
m********5
发帖数: 17667 | 27 http://www.youtube.com/watch?v=aHnQWPjS7aE
At the recent Google “Solve for X” conference on February 7, Lockheed
Martin's long-term R&D department (“Skunk Works”) announced they are
working on a compact fusion reactor. With what seems a 4th generation
prototype called "T4", the aerospace giant says to have developed a high
beta configuration, which allows a compact reactor design and faster
development timeline.
Lockheed Martin and its infamous "Skunk Works" top-secret technology
development gro... 阅读全帖 |
|
h***i
发帖数: 89031 | 28 美国害怕中国反应堆多了，用lithium6制造tritium
如果不向中国封锁实用技术，中国早就到处是反应堆了 |
|
|
d*b
发帖数: 21830 | 30 美国核电站事故不是没有，但大型事故非常低，比如去年我就听NRC的头说过，他们巡
回检查，从某申请工作的妇女的background screen过程中检出tritium，是闪烁计数器
scanner查尿样的时候发现的，不但她身上有，她家孩子身上也有，判断来源是丫在20
年前某核电站的工作经历。那时候核泄露没发现，美国核电站不是没有事故，但因为有
NRC这样的监管机构，大事故，特大事故率非常低。小事故你们去NRC的weekly报告，从
来都是长长的list.
中国要造核电站没错，关键是research要先行，比如NRC的CFR基本就是research
summary, 这方面中国太弱了。 |
|
m**********e
发帖数: 12525 | 31 美帝核武器主力是W88氢弹
因为tritium半衰期只有12年,所以每年必须更换存储衰变产生氦气的gas cannister,
每隔几年还得拆开更换lithium deuteride
所以维护成本是非常高的 |
|
d*b
发帖数: 21830 | 32 是的，本来是volsov方程，于引进高阶近似，用了boltzmann,这样可以更精确的控制当
量。丫的台巴以为是于敏设计了一个新的几何结构。
在核武器领域基本没什么engineering什么事，都是理论物理的干活，核武器就是物理
。只有核材料的生产才涉及到engineering. 狗屁台巴屁也没见过就说用Tritium,他妈
的核材料都是稳定材料。所谓的核武器有效期是指里面的掺杂的有效期。台巴这次又迷
糊了吧？ |
|
l***8
发帖数: 2233 | 33 网上胡扯可以，不要扯出真东西，否则你比王丹姐更可恶
丹姐钓鱼，你们认真就输了
[在 dsb (大手笔) 的大作中提到：]
:是的，本来是volsov方程，于引进高阶近似，用了boltzmann,这样可以更精确的控制
当量。丫的台巴以为是于敏设计了一个新的几何结构。
:在核武器领域基本没什么engineering什么事，都是理论物理的干活，核武器就是物理
:。只有核材料的生产才涉及到engineering. 狗屁台巴屁也没见过就说用Tritium,他妈
:的核材料都是稳定材料。所谓的核武器有效期是指里面的掺杂的有效期。台巴这次又
迷糊了吧？ |
|
q********1
发帖数: 1480 | 34 【 以下文字转载自 GunsAndGears 讨论区 】
发信人: qingshi601 (青石村), 信区: GunsAndGears
标 题: 性感黑色蕾丝边
发信站: BBS 未名空间站 (Wed Jul 24 15:46:08 2013, 美东)
“蕾丝边“是北美枪友对Les Baer这家以手工定制1911型手枪和高精度AR半自动步
枪著名的公司的“昵称”。我新近入“蕾丝边” 1911一枝，却并非冲着这个性感的名
字。
1911门道深，种类多，但大体也可分为量产和“定制”（Custom）两类。“量产”指批
量生产的大路货；通常说的“定制”（Custom）其实名不副实，其实只是“半定制”（
semi-custom）,因为这只是指手工制造，精细加工的小批量产品，并非真正根据使用者
的体型、习惯的量身订做。真正的量身打造也是有的罢，但非以我的技术和财力能够
追求的东西，不去了解也罢。定制”的1911，最有名的品牌大致有Wilson Combat,
Nighthawk, Ed Brown, Volquartsen Custom 和 Les Baer。
我一直认为1911是长相最英俊的... 阅读全帖 |
|
l****z
发帖数: 29846 | 35 by Bruce N. Eimer, Ph.D
The question is often asked, “what is the best handgun for concealed carry?
” There are many valid answers to this question and they usually begin with
, “well, it depends on a number of factors.” However, in my humble opinion
, there is one universally valid answer, and that is, “it is the gun that
you have on you when you need it.” With that said, the purpose of this
brief article is to make you aware of twelve handguns that are so easy to
carry, that there is no excuse... 阅读全帖 |
|
c*****g
发帖数: 21627 | 36 2007年7月
In July of 2007, NYC
a 1924 steam pipe faulted on Lexington Avenue,
sending up a 40-story cloud of steam and raining mud and other
debris on rush-hour bystanders. Initial fears that the incident
was terror-related were proved false. One female died from
heart attack escaping the area, while a further 45 people were
injured.
2007年8月，明尼苏达州有桥梁断裂落入密西西比河，造成13人死亡
100辆车跌入河中
2009年6月22日17时2分，华盛顿DC地铁红线列车发生了相撞事故，
一列南向列车在托腾堡站（Fort Totten）附近的轨道上停车，另一列同向的列车从
后方撞上列车尾部，四节车厢全部叠成一团，将成客困在车内。
该事件造成9人死亡（含随车员... 阅读全帖 |
|
m********o
发帖数: 2088 | 37 【 以下文字转载自 Military 讨论区 】
发信人: dsb (大手笔), 信区: Military
标 题: Re: 傻逼台巴太弱了，所谓于敏构型是指输运模型
发信站: BBS 未名空间站 (Sat Dec 23 18:31:39 2017, 美东)
是的，本来是volsov方程，于引进高阶近似，用了boltzmann,这样可以更精确的控制当
量。丫的台巴以为是于敏设计了一个新的几何结构。
在核武器领域基本没什么engineering什么事，都是理论物理的干活，核武器就是物理
。只有核材料的生产才涉及到engineering. 狗屁台巴屁也没见过就说用Tritium,他妈
的核材料都是稳定材料。所谓的核武器有效期是指里面的掺杂的有效期。台巴这次又迷
糊了吧？ |
|
d****2
发帖数: 6250 | 38
glow in the dark (GITD)跟辐射物完全不同的玩意，而且现在辐射物的等同
替代是tritium，辐射不能穿透一张纸，以前的早就淘汰了。 |
|
j*******k
发帖数: 187 | 39 在读研究生，怀孕两个多月了，最近老板有打算让我做一些western blot的东西，想请
教下有类似经验的宝妈们，知道跑胶的一些东西比较有毒，但是不是只要带口罩和双层
gloves就好了，还是最好都不要做呢？还有每周都要用到一次radioactive 的isotope,
hydrogen -3 [tritium].每周剂量大概0.2 mCi左右，不知道这个可以接触吗？ 在公
司里面做的实验，看其他怀孕的女生都没有特别忌讳的，照样做，但总有点不放心，所
以上来请教下。谢 了！ |
|
B*********r
发帖数: 267 | 40 转载自http://blog.sina.com.cn/s/blog_521090fd01017f81.html
谈一谈核辐射
看到大家颇有些惊慌，介绍一下核辐射。
首先释放最多的是氮（nitrogen）16。但是这个对工作人员危害比较大，因为半衰期是
7 秒钟。
然后就是重氢（tritium）。这个也不怕，因为太弱，跑不远，而且连人都皮肤都攻不
破。
比较麻烦的一个是碘（isodine）131，半衰期是8天。所以美国西海岸，要是10天才过
来的话，应该安全。
这个打击的是甲状腺，癌症。尤其是对生长期的儿童，危害颇大。但是对付它的是碘化
钾。所以如果方向吹向大陆，大家要吃这个。
然后最要命的是铯（cesium）137。这玩意半衰期30 年，是很厉害的核坚强。
进了人体，会导致细胞变异，染色体出问题，癌症那种。现在大家接触到的，基本上是
各大流氓核爆炸试验后，大气层上飘下来的。 |
|
g********4
发帖数: 4959 | 41 发信人: minwen (minwen), 信区: Military
标 题: 完蛋了，加拿大的核电站也出问题，2012真的来了
发信站: BBS 未名空间站 (Wed Mar 16 18:32:26 2011, 美东)
完蛋了，加拿大的核电站也出问题，2012真的来了，估计一个星期后美国也要糟，大家
逃命去吧。
Ontario Power Generation: Unplanned Water Release Not A Threat
DOW JONES NEWSWIRES
Ontario Power Generation Inc. (OPG.YY) said its nuclear power station in
Pickering, Ont. unintentionally released water into the environment on
Tuesday due to the failure of a pump seal.
In a statement posted on its website, the big electric utility, which i... 阅读全帖 |
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R*R
发帖数: 2661 | 42 Another potential worry: The makeup of the radioactive material being leaked
by the plant has changed. Buesseler said the initial leak had a high
concentration of cesium isotopes, but the water flowing from the plant into
the ocean now is likely to be proportionally much higher in strontium-90,
another radioactive substance that is absorbed differently by the human body
and has different risks. The tanks (on the plant site) have 100 times more
strontium than cesium, Buesseler said. He believes t... 阅读全帖 |
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l**********3
发帖数: 2088 | 43 Tritium的half life很长（12。3年）辐射很小， 含量更小， 是自然界普遍存在的。
没什么威胁。
另外refueling tank跟外界基本上可以说是毫无关系。refueling tank里面的主要的就
是水加boron acid没什么希奇的。 |
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d*b
发帖数: 21830 | 44 Tritium泄漏你的geiger counter是测不到的，要用liquid scintillation counter才
能测。 |
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p*x
发帖数: 961 | 45 thank you so much for you input!
do you know if standard SP-01 has Tritium sights? |
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l****8
发帖数: 969 | 46 SKU: 163072
Model: M&P340
Caliber: .357MAG/.38+P
Capacity: 5 Rounds
Barrel Length: 1.87"
Front Sight: XS Sights® 24/7 Tritium Night
Rear Sight: Integral U-Notch
Grip: Synthetic
Overall Length: 6.31"
Weight Empty: 13.3 oz.
Material: Scandium Alloy Frame/Stainless Steel Cylinder
Finish: Matte Black
Frame Size: Small - Centennial Style
Action: Double Action Only
不会贴图。 |
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x*****g
发帖数: 87 | 47 圣诞节前后买的,还没打过.但感觉握把没有前面买的CZ-75 COMPACT 舒服.但安全设计
多些.
Total: $1000
Springfield Armory Lightweight Operator 1911, Stainless Slide,
.45ACP, 3" Barrel, 6 Rd, Tritium Night Sight with X-treme Mini Light. |
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f***a
发帖数: 1434 | 49 今天拿到了hunting lisense，悲剧地发现，原来lisense也有不是名片状的。。。
想买第一支枪，激动地去枪店看了。悲剧地发现我这里是小地方，枪店里货不全。
这个枪店可以0利息分期付款，所以一开始去就奔HK 45问的。店员人好，但误以为USP
45就是 HK 45，于是我又解释了一番，他上网查了才明白过来。
可惜店里没有 HK 45，也没有CZ系列中我想要的 CZ75 SP-01。如果调货，那价格就是
官方建议零售价。。。
店员给我推荐一个二手 HK USP 45，没拍照，从网上找了个图。这个二手 USP 从我这
个新手看来，成色不错，还加了一个 tritium night sight。 店员告诉我只打了几百
round，这个店员人不错，应该说的是实话。
请问一下各位大拿，这支二手 USP 价格850$可值得？ |
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