Thorium and Radium Isotope Concentrations Measured during the JGOFS Equatorial Pacific Process Study (EQPAC)
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资源简介：
The Equatorial Pacific Process Study (EQPAC) was conducted along 140 deg W
longitude during 1992.
Four cruises took place: February 3 - March 9, March 19 - April 15,
August 5 - September 18, and September 24 - October 21. A fifth benthic
cruise and sediment trap legs were added. During the first cruise
(TT007), 15 stations were occupied along 140 deg W longitude from
12 deg N latitude to 12 deg S latitude. During the second cruise
(TT008), data were collected at 8 stations along 140 deg W longitude
from 9 deg S latitude to 9 deg N latitude. During the third cruise
(TT011), data were collected at 15 stations along 140 deg W from 12 deg N
latitude to 12 deg S latitude. During the fourth cruise (TT012), data were
collected at 5 stations along 140 deg W longitude from 17 deg S
latitude to the equator.
Thorium and radium isotope concentrations were measured on two of
the cruises: TT007 and TT012. A Multiple Unit Large Volume in situ
Filtration System (MULVFS) was used to obtain samples from approximate
depths of 0, 25, 50, 95, 140, 215, 340, 440, 535, 630 and 800 meters.
Radium-226 was measured by gamma spectrometry. Thorium-228 and
thorium-230 were measured by alpha spectrometry and accelerator mass
spectrometry. Radium-228 was measured by alpha spectrometry after 1
year via the ingrown thorium-228.
The data is public domain and can be retrieved on-line at
"http://usjgofs.whoi.edu/jg/dir/jgofs/"
[The information in this summary was taken from the JGOFS
World Wide Web pages.]
提供机构：
SCIOPS
