[fluka-discuss]: Anomalous C14 activation in air

From: Oscar Frasciello <oscar.frasciello_at_lnf.infn.it>
Date: Thu, 10 Sep 2015 12:13:19 +0200

Dear FLUKA experts,
I am studying the air activation in a 320 MeV e- dump hosting region
(C105 in the attached input file).

As the attached tab.lis files show (the 4 logic unit numbers 33, 34 ,
35, 36 refer to the four specified cooling times), I found out that C14
results in a specific activation not constant in the four specified
cooling times up to 10 years (a time very short wrt the half-time of
~5000 years of beta- decay of C14). At 1 second of cooling time FLUKA
returns ~2.5944E-6 +- 13.25% Bq/cm3 of specific activation, whereas at
the following 1m, 1y and 10y cooling times a value of ~2.1475E-15 +-
13.25% Bq/cm3.

I would expect a constant specific activation for C14 in ten years, I
cannot figure out how to explain 9 orders of magnitude of difference
already after 1 month. What am I missing?

Best regards,

-- 
Oscar Frasciello
Radiation Protection Unit FISMEL
Istituto Nazionale di Fisica Nucleare
Laboratori Nazionali di Frascati
Via Enrico Fermi 40
00044 Frascati (RM) Italy
Tel. office: +39 06 9403 2104
Tel. Tenocode: +39 06 9403 8114
Fax FISMEL: +39 06 9403 2364
email: oscar.frasciello_at_lnf.infn.it







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Received on Thu Sep 10 2015 - 13:48:21 CEST

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