[ RadSafe ] Radioactive contamination unearthed at former rocket test site near Los Angeles - U.S. News
cary.renquist at ezag.com
Fri Dec 14 12:35:25 CST 2012
U.S. EPA's Final Technical Memorandum Look-Up Table Recommendations
This is a link to a pdf that seems to have the background threshold values for the nuclides of interest (Table 2 of attachment 1).
Pursuant to an interagency agreement between the U.S. Department of Energy (DOE) and U.S. Environmental Protection Agency (USEPA), the USEPA has conducted a Radiological Background Study to determine the background levels for radionuclides in surface and subsurface soils associated with Area IV and the Northern Buffer Zone (Area IV Study Area1) of the Santa Susana Field Laboratory (SSFL), located in Ventura County, California. In addition, the USEPA is currently conducting a radiological characterization of the Area IV Study Area to identify areas that exhibit radionuclide concentrations in surface and subsurface soil and sediment above background levels (herein, "soil" shall mean surface and subsurface soil as well as surface and subsurface sediment unless otherwise specified).
I didn't see a doc that has the presented results of the soil samples, however, this article at least has some details:
Latest soil tests at Santa Susana Field Lab site shows radioactive material remains - LA Daily News
The EPA researchers collected 3,735 samples of mostly surface soil and found that of those, 500 contained concentrations of radioactive materials that exceeded what is known as background standards - or the levels occurring naturally in the environment. Almost all were man-made radionuclides. Most of those samples contained Cesium-137, and of those one sample reached levels up to 1,000 times above background standard. There were 153 samples of Stronium-90 and of those some hits reached levels that were 284 times higher than background.
Both radioactive elements are considered dangerous to human health when present at high levels.
"There were some hits that were elevated but for the most part, they were in the range that we expected," said John Jones, federal project director with the Department of Energy.
cary.renquist at ezag.com
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Robert J Gunter
Sent: Friday, 14 December 2012 6:38 AM
To: 'Robert Atkinson'; 'The International Radiation Protection (Health Physics)Mailing List'
Subject: Re: [ RadSafe ] Radioactive contamination unearthed atformer rocket test site near Los Angeles - U.S. News
Not a very informative statement: "10 percent contained radioactive
concentrations exceeding background levels."
This could easily be fill from another location or different aggregate based
on this statement alone. Is it NORM or Cs-137?
Robert J. Gunter, MSc, CHP
CHP Consultants/CHP Dosimetry
Toll Free: (888) 766-4833
Fax: (866) 491-9913
Cel: (865) 387-0028
rjgunter at chpconsultants.com
From: Steven Dapra <sjd at swcp.com>
To: The International Radiation Protection (Health Physics) Mailing List
<radsafe at agni.phys.iit.edu>
Sent: Friday, 14 December 2012, 2:53
Subject: Re: [ RadSafe ] Radioactive contamination unearthed at former
rocket test site near Los Angeles - U.S. News
From the NBC article:
"Technicians collected 3,735 soil samples from a corner of the 2,850-acre
hilltop lab where most of the testing was done. Of those, they found about
10 percent contained radioactive concentrations exceeding background
Yep. Time to panic. No doubt about it.
At 01:14 PM 12/13/2012, you wrote:
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