Improvement of the dosimetric properties of chemical-vapor-deposited diamond films by neutron irradiation

被引：21

作者：

Bruzzi, M

Menichelli, D

Pini, S

Bucciolini, M

Mólnar, J

Fenyvesi, A

机构：

[1] Univ Florence, Dipartimento Energet, I-50139 Florence, Italy

[2] INFM, I-50018 Sesto Fiorentino, Italy

[3] Dipartimento Fisiopatol Clin, Florence, Italy

[4] Ist Nazl Fis Nucl, I-50018 Sesto Fiorentino, Italy

[5] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary

来源：

APPLIED PHYSICS LETTERS | 2002年 / 81卷 / 02期

关键词：

D O I：

10.1063/1.1491014

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The performance of chemical-vapor-deposited (CVD) diamond films as on-line dosimeters has been substantially improved after irradiation with fast neutrons up to a fluence of 5x10(14) n/cm(2). This is correlated to a decrease of more than one order of magnitude in the concentration of deep levels with activation energy in the range 0.9-1.4 eV, as observed by thermally stimulated current and photoinduced current transient spectroscopy. As a consequence, a fast and reproducible dynamic response is observed during irradiation with a 6 MV photon beam from linear accelerator and with a Co-60 source. A quasilinear dependence of the current on the dose rate is obtained in the range of interest for clinical applications (0.1-10 Gy/min). The resulting sensitivity is definitely higher than that of standard ionization chambers, and compares favorably with those of standard silicon dosimeters and of best-quality natural and CVD diamond devices. (C) 2002 American Institute of Physics.

引用

页码：298 / 300

页数：3

共 20 条

[1] Neutron damage of CVD diamond [J].

Allers, L ;

Howard, AS ;

Hassard, JF ;

Mainwood, A .

[2] Electronic dosimeters based on solid state detectors [J].

Barthe, J .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2001, 184 (1-2) :158-189

[3] Deep levels and trapping mechanisms in chemical vapor deposited diamond [J].

Bruzzi, M ;

Menichelli, D ;

Sciortino, S ;

Lombardi, L .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (09) :5765-5774

[4] RADIATION DETECTORS MADE FROM DIAMONDS [J].

BURGEMEISTER, EA .

PHYSICA B & C, 1981, 111 (2-3) :319-320

[5] A study of radiotherapy dosimeters based on diamond grown by chemical vapour deposition [J].

Buttar, CM ;

Airey, R ;

Conway, J ;

Hill, G ;

Ramkumar, S ;

Scarsbrook, G ;

Sussmann, RS ;

Walker, S ;

Whitehead, A .

[6] VACANCY-RELATED CENTERS IN DIAMOND [J].

DAVIES, G ;

LAWSON, SC ;

COLLINS, AT ;

MAINWOOD, A ;

SHARP, SJ .

PHYSICAL REVIEW B, 1992, 46 (20) :13157-13170

[7] An investigation of the operating characteristics of two PTW diamond detectors in photon and electron beams [J].

De Angelis, C ;

Onori, S ;

Pacilio, M ;

Cirrone, GAP ;

Cuttone, G ;

Raffaele, L ;

Bucciolini, M ;

Mazzocchi, S .

MEDICAL PHYSICS, 2002, 29 (02) :248-254

[8]

Fowler JF., 1966, RAD DOSIMETRY, V2, P291

[9] Thickness dependence of density of gap states in diamond films studied using space-charge-limited current [J].

Gan, B ;

Ahn, J ;

Rusli ;

Zhang, Q ;

Yoon, SF ;

Ligatchev, VA ;

Yu, J ;

Chew, K ;

Huang, QF .

JOURNAL OF APPLIED PHYSICS, 2001, 89 (10) :5747-5753

[10] Identification of the neutral carbon [100]-split interstitial in diamond [J].

Hunt, DC ;

Twitchen, DJ ;

Newton, ME ;

Baker, JM ;

Anthony, TR ;

Banholzer, WF ;

Vagarali, SS .

PHYSICAL REVIEW B, 2000, 61 (06) :3863-3876

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