[ RadSafe ] Buildup factor for compounds

[Kai Kaletsch]

Thanks,
is the data library available for download from somewhere? It doesn't sound 
like it will help with compounds (except concrete water and air), but it 
would save some data entry.

Kai
----- Original Message ----- 
From: "Harold Careway" <hacrad at comcast.net>
To: <radsafe at radlab.nl>
Sent: Wednesday, August 30, 2006 3:06 PM
Subject: [ RadSafe ] Buildup factor for compounds


> Or see Oak Ridge data library collection DLC-129, Daniel.  You really 
> don't
> need the program as an excel workbook with the data library can be built 
> to
> do the job.  Generally it can get you pretty close to where you want to 
> go.
>
>
>
> Hal Careway
>
>
>
> The ANS-6.4.3 1988 buildup factor database is being made available by
> placing a file of Geometric Progression (GP) coefficients and a sample
> "retrieval" program, Daniel, in the Radiation Shielding Information Center
> Data Library Collection. The coefficients were determined in Japan from 
> the
> 1988 compilation of ANS-6.4.3. The work by the group continues, and it is
> expected that additional revisions will be made.
>
>
>
> The present database is an update of the 1985 database. Many revisions 
> have
> been made, the most significant is the complete replacement of the tables
> from molybdenum to uranium. The data for those elements are from PALLAS
> results and include the effect of bremsstrahlung due to high-energy
> electrons from photon interactions. The beryllium data have been
> significantly revised, and the following elements have been added: tin,
> lanthanum, gadolinium, and tungsten. The GP coefficients have been revised
> throughout the database, mainly to improve interpolation in 
> thecoefficients.
> The ANS-6.4.3 compilation is described in Ref. 1.
>
>
>
> The present file has data for Be, B, C, N, O, Na, Mg, Al, Si, P, S, Ar, K,
> Ca, Fe, Cu, Mo, Sn, La, Gd, W, Pb, U, water, concrete, and air. Two 
> buildup
> factors are available: exposure (air response) and energy absorption. Most
> of the buildup factor data for the elements up to copper is based on 
> moments
> method results from the U.S. National Bureau of Standards; the remainder 
> is
> from PALLAS results. Results from ASFIT have been used in the validation
> process.
>
>
>
> The Daniel program consists of a main routine to print tables of buildup
> factors. It will print any number of tables covering the energy range of
> 0.02 to 15 MeV for thicknesses up to 60 mean free paths for each material
> specified in the input. The GP coefficients are read from a data file. The
> input consists of lines specifying the material and response in a 2A4
> format. The sample problem input is:
>
> *        CARB EXP
>
> *        CARB ABS
>
> *        AIR ABS.
>
> *        AIR EXP
>
> *        CONC EXP
>
> The possible input to specify materials are: BERY, BORO, CARB, NITR, OXYG,
> SODI, MAGN, ALUM, SILI, PHOS, SULP, ARGO, POTA, CALC, IRON, COPP, MOLY, 
> TIN,
> LANT, GADO, TUNG, LEAD, URAN, WATE, CONC, AIR. The program has been 
> revised
> to accommodate these 26 materials.
>
>
>
> Interpolation in energy allows any energy mesh but can only be changed by
> revising the main routine. Extrapolation beyond the input buildup data (40
> mfp) is allowed up to 60 mfp in the subroutine LITEBF.
>
>
>
>
>
>
>
> Hello Radsafers:
>
>>
>
>>        Is there an established or preferred method for estimation the
>
>>        dose buildup factor for compounds or mixtures of shielding
>
>>        materials?  I am trying to come up with reasonable values for
>
>>        things such as barite loaded concrete or iron loaded concrete.
>
>>
>
>>        Thanks in advance
>
>>
>
>>        Kai Kaletsch
>
>>        Environmental Instruments Canada Inc.
>
>>        http://www.eic.nu/
>
>
>
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