c******n
发帖数: 16403 | |
c******n
发帖数: 16403 | 2 http://latimesblogs.latimes.com/nationnow/2011/08/radioactive-i
ed.html
Very small amounts of a radioactive isotope of sulfur, believed to have trav
eled across the Pacific Ocean from the Fukushima nuclear plant in Japan, hav
e been detected in La Jolla, Calif., by UC San Diego scientists.
But there's no need to worry: The amounts are nowhere near enough to cause h
ealth problems, researchers said.
Senior author Mark Thiemens and his team keep tabs on levels of sulfur-35 as
part of their climate research. Readings collected shortly after the March
11 tsunami in Japan indicated that there were 1,500 atoms of sulfur-35 per c
ubic meter of air in La Jolla, a significant increase over normal levels.
The UCSD team interpreted the bump as the result of a reaction that would ha
ve occurred when plant workers used seawater to cool overheating reactors at
Fukushima. Neutrons from the reactor core would have reacted with chlorine
in ocean water to create radioactive sulfur, Thiemens said.
"The levels we observed are in no way harmful in California," Thiemens said.
The group reported the measurements Monday in the journal Proceedings of the
National Academy of Sciences.
Thiemens and his colleagues use highly sensitive instruments to detect the m
inuscule amounts of radioactive sulfur that circulate naturally in the atmos
phere. That they detected a bump in levels of radioactive sulfur was "not s
urprising," said Kai Vetter, who teaches radiation detection at UC Berkeley.
Vetter's lab has been tracking incoming radiation from Japan and has repor
ted upticks too -- though again, nothing that would pose a danger to people
in the U.S.
But Vetter and other nuclear engineers questioned elements of the research,
which used the readings taken in La Jolla to extrapolate the amount of neutr
on leakage from the Fukushima plant. Elmer Lewis of Northwestern University
and Michael Golay of MIT were unconvinced that the radiation in question ev
en originated at the nuclear plant.
Edward Morse, of UC Berkeley, said that the traces of radioactive sulfur pro
bably originated at Fukushima, but he took issue with the team's final calcu
lations.
"They're not nuclear engineers," Morse said. "They were a little out of thei
r depth."
For the Record, 8:45 p.m. Aug. 15: An earlier version of this post said that
readings indicated there were 1,500 atoms of sulfur-35 per square meter of
air in La Jolla. It should have said per cubic meter.
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-- Eryn Brown
Photo: Tsunami waves approach tanks of heavy oil for the Unit 5 reactor of t
he Fukushima Daiichi nuclear complex in Okuma, Fukushima Prefecture, northea
stern Japan, in this March 11 photo released by Tokyo Electric Power Co. The
waves unleashed by a magnitude-9 earthquake destroyed backup generators for
several reactors' cooling systems, and the nuclear cores in three reactors
melted. Credit: AP Photo/Tokyo Electric Power Co.
【在 c******n 的大作中提到】
: http://www.mitbbs.com/article_t/Military/36296959.html
: also on LA times.
|
m******g
发帖数: 966 | 3 难怪我窗台上的改革这两天叫个不停。
【在 c******n 的大作中提到】
: http://www.mitbbs.com/article_t/Military/36296959.html
: also on LA times.
|
c******n
发帖数: 16403 | 4 为啥自己家里放改革
【在 m******g 的大作中提到】
: 难怪我窗台上的改革这两天叫个不停。
|
m******g
发帖数: 966 | 5 据说防辐射，也不知道是不是被人忽悠了。
【在 c******n 的大作中提到】
: 为啥自己家里放改革
|
W********w
发帖数: 771 | |
v**p
发帖数: 78 | |
t**********1
发帖数: 7316 | 8 la jolla到底有没有日本过来旅游的辐射啊？ |
i****a
发帖数: 36252 | 9 有
【在 t**********1 的大作中提到】
: la jolla到底有没有日本过来旅游的辐射啊？
|
t**********1
发帖数: 7316 | 10 水，牛奶，还是水果呢？
谢谢
【在 i****a 的大作中提到】
: 有
|
|
|
i****a
发帖数: 36252 | 11 好象是空氣
【在 t**********1 的大作中提到】
: 水，牛奶，还是水果呢？
: 谢谢
|
A******M
发帖数: 1587 | |
t**********1
发帖数: 7316 | 13 辐射肯定是越积累越多啊
//日本的辐射塔根本没解决啊 |
D**********R
发帖数: 25234 | 14 就我一个人是看了题目受不了这个翻译风格才进来的么？ |
y****i
发帖数: 17878 | 15 better translation, please?
【在 D**********R 的大作中提到】
: 就我一个人是看了题目受不了这个翻译风格才进来的么？
|
l*****a
发帖数: 14598 | 16 搬个小板凳等专业人士的翻译
【在 y****i 的大作中提到】
: better translation, please?
|
D**********R
发帖数: 25234 | 17 你在中文里听过。。。。被发现，这个说法的吗？
【在 y****i 的大作中提到】
: better translation, please?
|
l*****a
发帖数: 14598 | 18 中文里的被 一般怎么用？除了棉被以外...
【在 D**********R 的大作中提到】
: 你在中文里听过。。。。被发现，这个说法的吗？
|
m***8
发帖数: 7797 | |
