The ENEA fast neutron dosemeter is based on a planar P ADC (Poly Allyl Diglicol Carbonate) placed in a polyethylene holder. The employed CR39 (Registered Trademark of PPG Industries Inc.) material, produced by Intercast Europe S.p.A., has been introduced in the routine of the Individual Monitoring Service since 1998. Since then, acceptance tests on average sheet background track density and sheet neutron sensitivity have been made on new batches as a quality control within a Quality Assurance programme of the Individual Monitoring Service (IMS) of ENEA - Institute far Radiation Protection (IRP). Dosemeters have been irradiated with 241Am-Be source at ENEA-IRP and processed through a chemical etching procedure (pre-etching with 40% KOH water solution 6.25 N and 60% ethyl a1cohol at 70°C followed by 12 hours etching in 6.25 N KOH water solution). Herein we present the analysis of acceptance testing data for more than 30 sheets of CR-39 plastic produced in 1998, 1999 and 2000.Moreover, we compare the performance of sheets of CR-39 of standard composition with the one of sheets of CR-39 with the addition of DOP (Dioctylphthalate), in different concentrations, on the basis of average background density, neutron sensitivity and background fluctuation that limits the lower detectable dose.The study enhances the need of acceptance tests to assure the quality of the dosimetric performance of the dosemeters, which is considerably dependent on the quality of the CR-39 plastic.
CR-39 Acceptance Test and Optimization for Fast Neutron Dosymetry Applications
Falangi, G.;Morelli, B.;Fantuzzi, E.
2002-07-01
Abstract
The ENEA fast neutron dosemeter is based on a planar P ADC (Poly Allyl Diglicol Carbonate) placed in a polyethylene holder. The employed CR39 (Registered Trademark of PPG Industries Inc.) material, produced by Intercast Europe S.p.A., has been introduced in the routine of the Individual Monitoring Service since 1998. Since then, acceptance tests on average sheet background track density and sheet neutron sensitivity have been made on new batches as a quality control within a Quality Assurance programme of the Individual Monitoring Service (IMS) of ENEA - Institute far Radiation Protection (IRP). Dosemeters have been irradiated with 241Am-Be source at ENEA-IRP and processed through a chemical etching procedure (pre-etching with 40% KOH water solution 6.25 N and 60% ethyl a1cohol at 70°C followed by 12 hours etching in 6.25 N KOH water solution). Herein we present the analysis of acceptance testing data for more than 30 sheets of CR-39 plastic produced in 1998, 1999 and 2000.Moreover, we compare the performance of sheets of CR-39 of standard composition with the one of sheets of CR-39 with the addition of DOP (Dioctylphthalate), in different concentrations, on the basis of average background density, neutron sensitivity and background fluctuation that limits the lower detectable dose.The study enhances the need of acceptance tests to assure the quality of the dosimetric performance of the dosemeters, which is considerably dependent on the quality of the CR-39 plastic.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
