r*********r
发帖数: 3195 | 1 在加州 和 国内沿海, 到底会不会受影响? 该做点什么措施以防万一? | s*****e
发帖数: 21415 | 2 目前来看基本无事。
核反应二次裂变产物总有裂变完的一天呀。半衰期也就是几天工夫
【在 r*********r 的大作中提到】
: 在加州 和 国内沿海, 到底会不会受影响? 该做点什么措施以防万一?
| G********d
发帖数: 10250 | 3 我觉得应该去target屯完足够多的纯净水 食物
在核污染情况下 每天只喝储存的罐装水 和 食物
并且用罐装水洗澡洗脸刷牙
然后把房间门窗都堵起来
如果能够呼吸事先储存的罐装空气 那就更加好了
【在 r*********r 的大作中提到】
: 在加州 和 国内沿海, 到底会不会受影响? 该做点什么措施以防万一?
| r*********r
发帖数: 3195 | 4 逃跑是不是更好的办法?
【在 G********d 的大作中提到】
: 我觉得应该去target屯完足够多的纯净水 食物
: 在核污染情况下 每天只喝储存的罐装水 和 食物
: 并且用罐装水洗澡洗脸刷牙
: 然后把房间门窗都堵起来
: 如果能够呼吸事先储存的罐装空气 那就更加好了
| t****g
发帖数: 35582 | 5 加州是不可能的，国内沿海估计最多也就是吃个一年的辐射量之类的，对健康没啥问题。
【在 r*********r 的大作中提到】
: 在加州 和 国内沿海, 到底会不会受影响? 该做点什么措施以防万一?
| t****g
发帖数: 35582 | 6 要是爆一个快中子增殖堆，呵呵，大家就有的玩了。
【在 s*****e 的大作中提到】
: 目前来看基本无事。
: 核反应二次裂变产物总有裂变完的一天呀。半衰期也就是几天工夫
| G*******g
发帖数: 556 | 7 反应堆已经停堆了，现在的辐射都是衰变辐射，衰变引发的中子辐射量很小，相比反应
堆运行的时候。
要是爆一个快中子增殖堆，呵呵，大家就有的玩了。
【在 t****g 的大作中提到】
: 要是爆一个快中子增殖堆，呵呵，大家就有的玩了。
| s*****e
发帖数: 21415 | 8 就是这个道理。。。。
不知道谁开始恐慌性抛售股票，目前看起来有点傻。当然将来看什么可能都有。
【在 G*******g 的大作中提到】
: 反应堆已经停堆了，现在的辐射都是衰变辐射，衰变引发的中子辐射量很小，相比反应
: 堆运行的时候。
:
: 要是爆一个快中子增殖堆，呵呵，大家就有的玩了。
| G*******g
发帖数: 556 | 9 小日本抢险不给力啊，越抢事故越多。再差劲也要把反应堆压力壳保住，只要压力壳还
在就不至于像齐尔诺贝利那么严重。不过苏联那次是没有先兆突然爆炸的，小日本这次
坐视压力甚高、爆炸一个接一个愣是没有办法，不知道他们怎么搞的。
【在 s*****e 的大作中提到】
: 就是这个道理。。。。
: 不知道谁开始恐慌性抛售股票，目前看起来有点傻。当然将来看什么可能都有。
| r*********r
发帖数: 3195 | 10 这个东电公司好像在极力隐瞒事情的严重度.
【在 G*******g 的大作中提到】
: 小日本抢险不给力啊，越抢事故越多。再差劲也要把反应堆压力壳保住，只要压力壳还
: 在就不至于像齐尔诺贝利那么严重。不过苏联那次是没有先兆突然爆炸的，小日本这次
: 坐视压力甚高、爆炸一个接一个愣是没有办法，不知道他们怎么搞的。
| | | h*******g
发帖数: 10585 | 11 镉棒是从下面插的，有几个反应堆他们不确定是否封堆。
anyway，我还是和跳老一样持乐观态度的。 | v***a
发帖数: 23651 | 12 恩
比TG还差劲
【在 r*********r 的大作中提到】
: 这个东电公司好像在极力隐瞒事情的严重度.
| x***k
发帖数: 20754 | 13 小日本就这德性，看多了日剧就知道了，经常在日剧里有表现的
【在 v***a 的大作中提到】
: 恩
: 比TG还差劲
| l****e
发帖数: 137 | 14 真是无知无畏. 半衰期上千年的一大堆.
【在 s*****e 的大作中提到】
: 目前来看基本无事。
: 核反应二次裂变产物总有裂变完的一天呀。半衰期也就是几天工夫
| G*******g
发帖数: 556 | 15 半衰期千年以上的的说明其放射性活度很小，即使毒性很强，但是衰变速率很慢，实际
造成的剂量率不一定很大。当然只要这些长寿命放射性元素存在，被污染的事实就改变
不了。
真是无知无畏. 半衰期上千年的一大堆.
【在 l****e 的大作中提到】
: 真是无知无畏. 半衰期上千年的一大堆.
| a**i
发帖数: 7261 | 16 活度很小只是相对于核爆而言的
【在 G*******g 的大作中提到】
: 半衰期千年以上的的说明其放射性活度很小，即使毒性很强，但是衰变速率很慢，实际
: 造成的剂量率不一定很大。当然只要这些长寿命放射性元素存在，被污染的事实就改变
: 不了。
:
: 真是无知无畏. 半衰期上千年的一大堆.
| l****e
发帖数: 137 | 17
totally wrong. with a very long half-life time, it means the activity at
release will stay for ever. just like you mentioned it is due to the fact that the decay rate is very very slow.
Here, decay means from radioactive to non-radioactive, not from non-radioactive to radioactive.
【在 G*******g 的大作中提到】
: 半衰期千年以上的的说明其放射性活度很小，即使毒性很强，但是衰变速率很慢，实际
: 造成的剂量率不一定很大。当然只要这些长寿命放射性元素存在，被污染的事实就改变
: 不了。
:
: 真是无知无畏. 半衰期上千年的一大堆.
| G*******g
发帖数: 556 | 18 You are still considering one side of the slowness, the other side is that
the "rate" is low, and one of the most significant measure of the radiation
threat to human body is the dose rate, which is the rate at which the
radiation is absorbed by human body. It is just the same fact appreciated
from two different points of view.
Therefore, after the short-lifed isotopes have decayed away, the radiation
level will drop significantly, but may still remain above acceptable level
for a very long time.
totally wrong. with a very long half-life time, it means the activity at
release will stay for ever. just like you
mentioned decay rate is very slow.
【在 l****e 的大作中提到】
:
: totally wrong. with a very long half-life time, it means the activity at
: release will stay for ever. just like you mentioned it is due to the fact that the decay rate is very very slow.
: Here, decay means from radioactive to non-radioactive, not from non-radioactive to radioactive.
| G*******g
发帖数: 556 | 19 放射性活度是单个放射性同位素的物理属性，和如何产生的无关，和量的多少也无关。
只要是长寿命同位素，其活度必然很小，否则就不是就没有那么长的半衰期了。
【在 a**i 的大作中提到】
: 活度很小只是相对于核爆而言的
| G*******g
发帖数: 556 | 20 yes, no one would expect anything to decay from non-rad to rad. BTW, decay
also can be rad-2-rad, leading to the production of more toxic isotope w.r.t
to human health. That further complicates the math though.
that the decay rate is very very slow.
radioactive to radioactive.
【在 l****e 的大作中提到】
:
: totally wrong. with a very long half-life time, it means the activity at
: release will stay for ever. just like you mentioned it is due to the fact that the decay rate is very very slow.
: Here, decay means from radioactive to non-radioactive, not from non-radioactive to radioactive.
| | | G**Y
发帖数: 33224 | 21 真不好说，
紧张中。。。
【在 r*********r 的大作中提到】
: 在加州 和 国内沿海, 到底会不会受影响? 该做点什么措施以防万一?
| G**Y
发帖数: 33224 | 22 tyning讲讲最坏情况吧
【在 t****g 的大作中提到】
: 要是爆一个快中子增殖堆，呵呵，大家就有的玩了。
| l****e
发帖数: 137 | 23 you mistaken the concept of item number, activity and radiation dose.
i guess u r thinking, oh, there is radiation leak, it leaks xxx item number
of radioactive nuclides, then oh, the
half-lifetime is very long, so the activity must be very low, so the dose is
low.
In reality, whenever there is radioactive leak, it is measured either by
activity or radiation dose, which means
if the significant components of the leak are long lived and the initial
activity or dose is high, the threat stays
very long.
radiation
【在 G*******g 的大作中提到】
: You are still considering one side of the slowness, the other side is that
: the "rate" is low, and one of the most significant measure of the radiation
: threat to human body is the dose rate, which is the rate at which the
: radiation is absorbed by human body. It is just the same fact appreciated
: from two different points of view.
: Therefore, after the short-lifed isotopes have decayed away, the radiation
: level will drop significantly, but may still remain above acceptable level
: for a very long time.
:
: totally wrong. with a very long half-life time, it means the activity at
| G*******g
发帖数: 556 | 24 Yes, the radiation will last long, but I am talking about its impact on
human health. I am not talking about dose here, but the dose RATE, which is
different from dose itself. It represent to a very large extend the actual
damage a radiation will do to human body. The damage that radiation can do
to a human body depends on the accumulative does, but more significantly on
dose rate, that is the dose that you receive per second. The activity can be
low, but the pollution duration can be long, they are not contradictive. So
after the first several decades, the area may remain so called 'polluted',
but the pollution level is actually not that high, not the same order it is
happening around the nuclear power plant right now.
The initial dose, which we are looking at right now, is mainly caused by
short-life isotopes, which will decay away very fast. By the same token,
the initial does caused by those long-life isotopes are actually orders
lower than those by shor-life ones. Aftter the initial decay period, the
radiation level will drop to the level of those long-term isotopes, which is
not that high from the very beginning. The concern with the long-life
isotopes is mainly associate with there long-term existance, not their
toxicity.
you mistaken the concept of item number, activity and radiation dose.
i guess u r thinking, oh, there is radiation leak, it leaks xxx item number
of radioactive nuclides, then oh, the
half-lifetime is very long, so the activity must be very low, so the dose is
low.
In reality, whenever there is radioactive leak, it is measured either by
activity or radiation dose, which means
if the significant components of the leak are long lived and the initial
activity or dose is high, the threat stays
very long.
radiation
【在 l****e 的大作中提到】
: you mistaken the concept of item number, activity and radiation dose.
: i guess u r thinking, oh, there is radiation leak, it leaks xxx item number
: of radioactive nuclides, then oh, the
: half-lifetime is very long, so the activity must be very low, so the dose is
: low.
: In reality, whenever there is radioactive leak, it is measured either by
: activity or radiation dose, which means
: if the significant components of the leak are long lived and the initial
: activity or dose is high, the threat stays
: very long.
| l****e
发帖数: 137 | 25 radiation dose in most cases is an abbreviation of radiation dose rate. like
in such a leak, when the radiation
dose level is reported, it is in the unit of mSv/hr. your interpretation of
accumulative dose and dose rate is
ok. the rest is not.
a
The
receive
long
plant
【在 G*******g 的大作中提到】
: Yes, the radiation will last long, but I am talking about its impact on
: human health. I am not talking about dose here, but the dose RATE, which is
: different from dose itself. It represent to a very large extend the actual
: damage a radiation will do to human body. The damage that radiation can do
: to a human body depends on the accumulative does, but more significantly on
: dose rate, that is the dose that you receive per second. The activity can be
: low, but the pollution duration can be long, they are not contradictive. So
: after the first several decades, the area may remain so called 'polluted',
: but the pollution level is actually not that high, not the same order it is
: happening around the nuclear power plant right now.
| G*******g
发帖数: 556 | 26 yes, the mSv/hr is high right now, but it is mainly caused by the short-life
isotope, because compared to these shor-life isotopes, the long-life ones
only contribute very little. After they decay away, the does rate
contribution from the long-life isotopes will be ordres lower than what is
being measured right now. That is my point.
like
of
【在 l****e 的大作中提到】
: radiation dose in most cases is an abbreviation of radiation dose rate. like
: in such a leak, when the radiation
: dose level is reported, it is in the unit of mSv/hr. your interpretation of
: accumulative dose and dose rate is
: ok. the rest is not.
:
: a
: The
: receive
: long
| l****e
发帖数: 137 | 27 the limit for radiation level is usually set at 2.5 uSv/hr or 0.25 merm/hr.
even 0.1% of the leak is long-lived
nuclides, it is a threat. by the way one of the most volatile radioactive
nuclides in the reactor is I-129 with a
half-live of 15.7 million yrs. ofcoz, it maybe not the major contribution.
life
【在 G*******g 的大作中提到】
: yes, the mSv/hr is high right now, but it is mainly caused by the short-life
: isotope, because compared to these shor-life isotopes, the long-life ones
: only contribute very little. After they decay away, the does rate
: contribution from the long-life isotopes will be ordres lower than what is
: being measured right now. That is my point.
:
: like
: of
| G*******g
发帖数: 556 | 28 so among the 0.1% extra dose, the contribution from I-129 is very limited,
though it will last through the end. The main body that makes the 0.1% extra
dose, right now, is Cs-137 and Sr-90. Ok, I see the difference, you are
talking about the 0.1% extra dose after hundreds of years, I am talking
about the 0.1% extra dose immediately after a nuclear accident. Yes, after
hundres of years, if 0.1% extra dose is measured, it will remain ~0.1% for a
long long time.
the limit for radiation level is usually set at 2.5 uSv/hr or 0.25 merm/hr.
even 0.1% of the leak is long-lived
nuclides, it is a threat. by the way one of the most volatile radioactive
nuclide in the reactor is I-129 with a
half-live of 15.7 million yrs.
life
【在 l****e 的大作中提到】
: the limit for radiation level is usually set at 2.5 uSv/hr or 0.25 merm/hr.
: even 0.1% of the leak is long-lived
: nuclides, it is a threat. by the way one of the most volatile radioactive
: nuclides in the reactor is I-129 with a
: half-live of 15.7 million yrs. ofcoz, it maybe not the major contribution.
:
: life
| j******h
发帖数: 3904 | 29 不可能到达切尔诺贝利的程度
只要停堆了和鸡蛋壳没被掀开 | j****c
发帖数: 19908 | | | | b*****e
发帖数: 14299 | | v***a
发帖数: 23651 | 32 您老说说看
搬个板凳听
【在 b*****e 的大作中提到】
: 一帮人连基本概念都没搞清楚，都在这边瞎掺乎。
| r*********n
发帖数: 13992 | 33 搬个玉蒲团坐好，洗耳恭听做学习状。。
【在 v***a 的大作中提到】
: 您老说说看
: 搬个板凳听
| g********r
发帖数: 8017 | 34 哇.玉蒲团这么好的东西,哪里有deal?
【在 r*********n 的大作中提到】
: 搬个玉蒲团坐好，洗耳恭听做学习状。。
| y*********e
发帖数: 7269 | 35 基本规律是：一旦专家出来解释，马上情况恶化。
这不刚宣布辐射量陡升了
【在 r*********r 的大作中提到】
: 在加州 和 国内沿海, 到底会不会受影响? 该做点什么措施以防万一?
| l****e
发帖数: 137 | 36 both Cs-137 & Sr-90 has a half life of ~30 yrs. they are usually the main
fission products released as well I-
131, which is ~ 8 day in half-life. So stop drinking milk for one month may
help.
extra
a
.
【在 G*******g 的大作中提到】
: so among the 0.1% extra dose, the contribution from I-129 is very limited,
: though it will last through the end. The main body that makes the 0.1% extra
: dose, right now, is Cs-137 and Sr-90. Ok, I see the difference, you are
: talking about the 0.1% extra dose after hundreds of years, I am talking
: about the 0.1% extra dose immediately after a nuclear accident. Yes, after
: hundres of years, if 0.1% extra dose is measured, it will remain ~0.1% for a
: long long time.
:
: the limit for radiation level is usually set at 2.5 uSv/hr or 0.25 merm/hr.
: even 0.1% of the leak is long-lived
|
|
