1,721,055 research outputs found
Technical procedures for the evaluation of different radiation detection systems at the entrance of a waste incinerator plant
No full text
Sensitivity tests and risk evaluation for steelworks portal systems
No full textFourteen portal systems installed at the entrance of as many iron scrap recycling plants have been tested. The systems which
underwent the test were supplied bythree manufacturers: Bicron, Eberline and Exploranium. For the tests, a truck trailer loaded
with iron scrap was equipped with guide tubes for the introduction of radioactive sources. During the whole experimental
campaign, the truck trailer was not modified, to assure test reproducibility. Analyzing the collected data, it was determined the
lowest exposure intensityin air from a 137Cs source still able to cause an alarm when, centered in the load, passes through
anyportal. On the basis of this value it follows a risk evaluation for a steelworks equipped (in agreement with the rules of
Lombardia region) with a portal at the entrance, area monitors for critical sites and gamma spectrometer for steel specimen.
© 2004 Elsevier Ltd. All rights reserved.
Keywords: Orphan sources; Portal system; Smelting accident
1. Introduction
Several reports (Lubenau and Yusko, 1998) on accidental
smelting of radioactive sources in furnaces confirm the possibilitythat
radioactive material might be mixed with scrap.
In Italysome accidents took place in the past; the major
are here listed (Risica and Neccetelli, 2000):
• 1990 137Cs contamination of an aluminium refineryin
two facilities and the relevant waste dump;
• 1991 137Cs contamination of an unauthorized dump of
wastes from aluminium melting;
• 1991 241Am contamination of some copper alloymanufacturer
and melting firms;
• 1993 137Cs contamination of a part of the Brescia and
Montirone goods yard;
∗ Corresponding author. Tel.: +39-223996366; fax: +39-
223996309.
E-mail address: [email protected] (F. Campi).
1350-4487/$ - see front matter © 2004 Elsevier Ltd. All rights reserved.
doi:10.1016/j.radmeas.2004.05.007
• 1995 137Cs contamination of dust from settled fumes in
a steel mill in the decommissioning phase;
• 1997 137Cs and 60Co contamination of the Alfa Acciai
steel mill;
• 1998 137Cs contamination of the soil in a scrap storage
depot.
The most severe accident was that happened at Alfa Acciai
steel mill, in which 7 GBq of 60Co and 150 GBq of 137Cs
were molten in furnace. The consequences of the accident
were rather limited. Indeed, part of the final product was
contaminated byCo-60, but the dust abatement plant had
been effective in avoiding release of 137Cs in the surrounding
environment. Nevertheless, the total cost of the accident
was more than 25 million Euros, including the decontamination
of the plant and the missed profits.
After this accident, the Lombardia Regional Council issued
an Ordinance (Regione Lombardia, 1997) to impose
different radiometric surveys on metal scrap to be recycled.
A first monitoring must be performed on the scrap container
at the entrance of the steel mill. The Ordinance does
not specifywha
Aspetti radiologici nell'emergenza nucleare: l'incidente di Fukushima.
No full textDopo una sintetica descrizione degli effetti acuti e ritardati delle radiazioni ionizzanti sull'uomo e delle tecniche di protezione che possono essere messe in atto in situazioni di emergenza per mitigare tali effetti, il documento mette a confronto le conseguenze degli incidenti di Chernobyl e di Fukushima dal punto di vista dell'impatto sull'ambiente e sull'uomo
Non-invasive measurement of water content in lung phantom by neutrons: latest improvements to the technique
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Cranioplastica e Radioprotezione: valutazione, mediante uno studio sperimentale, della dose di raggi X assorbiti da un paziente sottoposto a ricostruzione cranica
No full textSistema per la determinazione del contenuto di C14 nel moderatore di reattore gas grafite tramite produzione e campionamentodi Co2 in "situ"
No full textIl sistema consente la misura in situ di C-14 su grafite nucleare mediante genrazione di arco al plasma con successivo intrappolamento su drecsel a saturazione di soda caustica
Processo ed apparecchiatura per il prelievo di campioni da elementi di grafite per la determinazione del 14C
No full text- …
