RE: Skyshine from Burial Vaults

[gerald.lahti@EXELONCORP.COM]

Probably the best information for benchmarking this geometry is from the

"sky-shine" experiments done at Kansas State University by Richard Faw and

Ken Shultis.  This work, done mainly in the 1980's used Co-60 sources in

concrete "silos" (for side shielding) with and without top shielding lids.



I have one of their key reports (Report 188, Feb 1987, "The MicroSkyshine

Method for Gamma-Ray Skyshine Analysis") which includes their measured

results.  I have used this data for estimating sky-shine doses from similar

geometries.  I'm sure they (KSU) have published other papers on this series

of experiments, but I don't have any others at hand.



Also check ANSI/ANS-6.6.1 for additional information. 



* * * * * * * * * *

Jerry Lahti

Radiological Safety Specialist

Exelon Nuclear

phone (630) 657-3869

fax      (630) 657-4328

gerald.lahti@exeloncorp.com

* * * * * * * * * * 





-----Original Message-----

From: Nathan, Steve [mailto:Steve.Nathan@WXSMS.COM]

Sent: Monday, July 14, 2003 6:24 AM

To: radsafe@list.vanderbilt.edu

Subject: Skyshine from Burial Vaults





We have recently completed design studies for an underground  vault for low

activity (0.1 -0.4 Ci/gallon) Cs-137 waste.  The results indicate

significant dose rates at large distance from the vault due to skyshine.

Our customer has asked if we can provide benchmarks for the calculational

methodology (MCNP 4C Monte carol analysis) before they undertake

installation of a thick roof on the vault.



Does anyone have any empirical or analytic data that we could use to

benchmark our calculations.



Steve Nathan

WSMS, LLC



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