[ RadSafe ] Linear attenuation coefficient for biological ashes

[Lidia Silva]

Thank you Cary, and Stewart for your answers.

I could not have access to "old" papers, so I missed that 1975 reference.

Rgds

Lidia
________________________________________
De: radsafe-bounces at health.phys.iit.edu [radsafe-bounces at health.phys.iit.edu] em nome de Stewart Farber [radproject at sbcglobal.net]
Enviado: sexta-feira, 27 de Agosto de 2010 6:52
Para: The International Radiation Protection (Health Physics) Mailing List
Assunto: Re: [ RadSafe ] Linear attenuation coefficient for biological ashes

One has to be clear if they are looking for data on the composition of "cremains" -the ash resulting from the cremation of the entire body of a human being which is distinctly different from "soft-tissue" ash mentioned in the reference below. Since so much of the ash in cremains would be from bone, the mineral content and ash from bone would exceed the ash resulting from soft tissue combustion.

Accordingly there will be much more Ca in cremains as a % of total ash, and the K percentage in cremains would be a small fraction of that shown for soft tissue ash.

Stewart Farber, MS Public Health

Farber Medical Solutions, LLC

1285 Wood Ave.

Bridgeport, CT 06604



[203] 441-8433 [office]

[203] 522-2817 [cell]

[203] 367-0791 [fax]

website: http://www.farber-medical.com

--- On Thu, 8/26/10, Cary Renquist <cary.renquist at ezag.com> wrote:

From: Cary Renquist <cary.renquist at ezag.com>
Subject: Re: [ RadSafe ] Linear attenuation coefficient for biological ashes
To: radsafe at health.phys.iit.edu
Date: Thursday, August 26, 2010, 9:10 PM


If you just need a rough composition, then do a search for synthetic
biological ash....
A quick search turned up a 1975 paper that gives the following for soft
tissue ash.
 (I assume mass percent)
67% KH2PO4 25% NaCl, 3.6% MgO, 3.0% CaCO3 and 1.4 % Fe2O3
<http://ehis.niehs.nih.gov/members/1975/010/10011.PDF>

You can then use the NIST xcom interface (or download the xcom program):
NIST XCOM: Element/Compound/Mixture
<http://physics.nist.gov/PhysRefData/Xcom/html/xcom1.html>

Select the mixture radio-button and hit the submit-info button.

You can then enter the compound info and select your energy range/etc.

Good luck,
Cary

---
Cary Renquist
cary.renquist at ezag.com


-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Lidia Silva
Sent: Thursday, 26 August 2010 04:00
To: 'radsafe at health.phys.iit.edu'
Subject: [ RadSafe ] Linear attenuation coefficient for biological ashes

Dear all,

I am looking for the linear attenuation coefficient of X-rays in ashes.
I checked the NIST database
http://physics.nist.gov/PhysRefData/XrayMassCoef/tab4.html , but there
is no such material included.

Does anyone have a suggestion of where to find data for biological
ashes?

Rgds

Lidia Silva
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