Study of optical absorbance and MR relaxation of Fricke xylenol orange gel dosimeters

Gambarini, G.; Veronese, I.; Bettinelli, L.; Felisi, M.; Gargano, Marco; Ludwig, Nicola; Lenardi, Cristina; Carrara, M.; Collura, Giorgio; Gallo, Salvatore; Longo, A.; Marrale, Maurizio; Tranchina, Luigi; D’Errico, Francesco

doi:10.1016/j.radmeas.2017.03.024

Cited by 43 publications

(25 citation statements)

References 10 publications

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“…Of ten these dosimetric sys tems are aided by Monte Carlo sim u la tions that also pro vide many de tails on the par ti cle types and en ergy spec tra [17,30,31]. The re cent lit er a ture in cludes sev eral ex per i ments on Fricke gels aimed at op ti miz ing the rec ipe for in creas ing the sen si tivity to dose and/or the lo cal sta bil ity of the ra di a tion produced fer ric ions and ap pli ca tions for clin i cal beam dosim e try [32][33][34].…”

Section: Introductionmentioning

confidence: 94%

“…Fur ther more, the ef fect of the ad di tion of glu cose, su crose, starch, and lo cust bean on the re sponse of fer rous-agarose-xy le nol or ange gel do sim e try has been stud ied [35]. Many ex per i ments, in par tic u lar, have pur sued pre cisely the de vel op ment of a rec ipe for a Fricke gel that would op ti mize their per for mance as do sim e ters for read ing by MRI and/or op ti cal spec tro pho tom eters [32,36,37]. For this reason in some cases additive op ti cal in di ca tor has been added to the Fricke gel.…”

Section: Introductionmentioning

confidence: 99%

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Preliminary magnetic resonance relaxometric analysis of Fricke gel dosimeters produced with polyvinyl alcohol and glutaraldehyde

Gallo

Collura

Iacoviello³

et al. 2017

NUCL TECH RAD PROT

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This work de scribes the pre lim i nary anal y sis of Fricke gels do sim e ters char ac ter ized by a new for mu la tion mak ing use of a ma trix of poly vi nyl al co hol cross-linked by add ing glutaraldehyde and an a lyzed by means of nu clear mag netic res o nance relaxometry. In pre vi ous op ti cal stud ies, these gels have shown prom is ing dosimetric fea tures in terms of pho ton sen si tiv ity and low diffu sion of fer ric ions pro duced af ter ir ra di a tion. In this work, we used a por ta ble nu clear mag netic res o nance relaxometer to mea sure the re laxation times (which are im por tant for dosimetric ap pli ca tions) of these gel ma te ri als. For this pur pose, we per formed a study for op ti miz ing the ac qui si tion pa ram e ters with a nu clear magnetic res o nance relaxometer. Gel sam ples were ex posed to clin i cal 6 MV pho tons in the dose range be tween 0 and 20 Gy. Nu clear mag netic res o nance relaxometry mea sure ments were performed and the sen si tiv ity to pho ton beams was mea sured for var i ous val ues of the Fe 2+ ion con cen tra tion. The anal y ses pointed out that the MR sig nal in creases as the Fe 2+ con tent increases and the in crease is about 75 % when the con cen tra tion of Fe 2+ ions is in creased from 0.5 mM to 2.5 mM. Fur ther more, the sen si tiv ity im prove ment achieved with in creas ing the Fe 2+ con cen tra tion is about 60 %. This pa per shows that the por ta ble nu clear mag netic res onance relaxometer used for anal y sis of po rous ma te ri als can be used for char ac ter iza tion of these dosimetric gels and this study can be con sid ered as the first step for the char ac ter iza tion of these do sim e ters which in fu ture could be used for 3-D dose map ping in clin i cal ap pli ca tions.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Preliminary magnetic resonance relaxometric analysis of Fricke gel dosimeters produced with polyvinyl alcohol and glutaraldehyde

Gallo

Collura

Iacoviello³

et al. 2017

NUCL TECH RAD PROT

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“…The Fricke dosimeter consists of ferrous sulfate in an aqueous gel solution. The irradiation induce oxidation and to conversion of ferrous ions to ferric ions modified NMR relaxation rates [1,4,5] . Fricke gel exhibits high ion diffusion that causes low spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

Preliminary analysis of N-vinylpyrrolidone based polymer gel dosimeter

et al. 2018

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This paper aims to evaluate the dosimetric characteristics of modified VIPARnd for radiotherapy dosimetry using optical investigations. The absorbance spectrum of the irradiated gel dosimeter was evaluated optically with spectrophotometer techniques and with a CMOS imaging system. The useful dose range for the peak value and the relative area under the absorbance curve is 3-20 Gy. The dose-response curve for CMOS readout has an interval of linearity from 3-20 Gy. The modified VIPARnd developed has a good dose range and good temporal stability in the spectrophotometric analysis of the intervals studied. The CMOS readout is transportable, cheaper, easier to use and an excellent alternative for dosimetry.

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“…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].…”

Section: Introductionmentioning

confidence: 99%

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

Gallo

Iacoviello²,

Bartolotta

et al. 2017

Nuclear Instruments and Methods in Physics Research Section B:

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Study of optical absorbance and MR relaxation of Fricke xylenol orange gel dosimeters

Cited by 43 publications

References 10 publications

Preliminary magnetic resonance relaxometric analysis of Fricke gel dosimeters produced with polyvinyl alcohol and glutaraldehyde

Preliminary magnetic resonance relaxometric analysis of Fricke gel dosimeters produced with polyvinyl alcohol and glutaraldehyde

Preliminary analysis of N-vinylpyrrolidone based polymer gel dosimeter

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

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