Investigation of 3D diamond detector dosimetric characteristics

被引：6

作者：

Kanxheri, K. ^{[1
]}

Solestizi, L. Alunni ^{[1
]}

Biasini, M. ^{[1
,2
]}

Caprai, M. ^{[1
]}

Dipilato, A. C. ^{[3
]}

Iacco, M. ^{[4
]}

Ionica, M. ^{[1
]}

Lagomarsino, S. ^{[5
,6
]}

Menichelli, M. ^{[1
]}

Morozzi, A. ^{[1
,7
]}

Passeri, D. ^{[1
,7
]}

Sciortino, S. ^{[5
,6
]}

Talamonti, C. ^{[5
,8
]}

Zucchetti, C. ^{[4
]}

Servoli, L. ^{[1
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Perugia, Perugia, Italy

[2] Univ Perugia, Dipartimento Fis & Geol, Perugia, Italy

[3] Univ Perugia, Dipartimento Scie Chirurg & Biomed, Perugia, Italy

[4] Osped Santa Maria Misericordia, Dipartimento Fis Med, Perugia, Italy

[5] Ist Nazl Fis Nucl, Sez Firenze, Florence, Italy

[6] Univ Florence, Dipartimento Fis & Astron, Florence, Italy

[7] Univ Perugia, Dipartimento Ingn Elettron, Perugia, Italy

[8] Univ Florence, Dipartimento Sci Biomed Sperimentali & Clin Mario, Florence, Italy

来源：

JOURNAL OF INSTRUMENTATION | 2018年 / 13卷

关键词：

Diamond Detectors; Dosimetry concepts and apparatus; Radiotherapy concepts; SINGLE-CRYSTAL;

D O I：

10.1088/1748-0221/13/06/P06006

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Recently, a polycrystalline chemical vapor deposited (pCVD) 3D diamond detector with graphitic in bulk electrodes, fabricated using a pulsed laser technique has been evaluated for photon beam radiation dosimetry during in-air exposure. The same 3D diamond detector, has now been investigated to evaluate its performance under clinically relevant conditions putting the detector inside a Polymethylmethacrylate (PMMA) phantom, to obtain higher precision dosimetric measurements. The detector leakage current was of the order of +/- 25 pA or less for bias voltages up to -100 V. The 3D detector was tested for time stability and repeatability showing excellent performance with less than 0.6% signal variation. It also showed a linear response for low dose rates with a deviation from linearity of 2%. It was also possible to verify the detector response as a function of the depth in PMMA up to 18 cm.

引用

页数：11

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