Qualitative and quantitative thermoluminescence analysis on irradiated oregano

Application of the EN 1788 European standard for the control of saffron, pepper and blends

“…Definitively, these uncontrolled parameters suppose a lack of accuracy and precision in dose evaluation. Nevertheless, in case of irradiation of the whole sample one could successfully employ the additive dose procedure to evaluate the given dose (D'Oca et al, 2007;D'Oca et al, 2009).…”

The additive dose method for dose estimation in irradiated oregano by thermoluminescence technique

“…Each TL measurement carried out on the minerals deposited on disc was corrected for the corresponding ''TL blank", due to the TL emission of the steel disc without oregano and of the reagents used during the extraction procedure (D'Oca et al, 2007;EN 1788EN , 2001. The highest intensity of the TL response was found at about 200°C, according to previous results reported in literature (Sanderson et al, 1989); the TL signal was calculated as the integral of the corresponding net glow curve between 150°C and 250°C.…”

“…Back extrapolation to the dose axis gives an estimation of the original dose in the sample. The thermoluminescence response, TL 0 , due to the original dose D 0 (if any) in the minerals extracted from the sample under investigation, is first measured; the minerals are then irradiated with (almost two) increasing dose values between 1 and 3 kGy; the TL signal measured after each dose is added to TL 0 to obtain the corrected TL signal (D'Oca et al, 2007); the shape and the position of the glow curve of the irradiated silicates were actually the same, whatever the silicates were irradiated in the whole plant or alone. The first added dose (1 kGy) was also used to evaluate the TL ratio as suggested by the European protocol.…”

“…The aim of the present work was to improve and better define a practical quantitative procedure, whose some preliminary results were already published (D'Oca et al, 2007). It is based on thermoluminescence measurements and the additive dose method, and it is useful, besides the identification of the radiation treatment, also for a gross estimation of the original dose on food for which the TL analysis is applicable, such as oregano (Origanum vulgare); this is a particular Mediterranean spice, authorised for irradiation treatment to a maximum dose of 10 kGy (Directive, 1999/3/EC); the possibility of applying this procedure to irradiated species even after two months storage was investigated and assessed.…”

ESR dosimeter material properties of phenols compound exposed to radiotherapeutic electron beams

“…Among the various dosimetric systems there are ionization chambers [1], semiconductor detectors [2], radiochromic films [3][4][5][6], thermoluminescence (TLD) and optically stimulated luminescence dosimeters (OSL) [7][8][9][10][11][12][13][14], scintillation dosimeters [15][16][17][18] and gel dosimetry [19][20][21][22][23][24][25][26], all of which have advantages and disadvantages [27].…”