Improvement of charge resolution for high Z/b particles in CR-39 nuclear track detectors by means of two-step etching technique

Kodaira Satoshi
Naka Shuichiro
Yasuda Nakahiro
Kawashima Hajime
Kurano Mieko
Ota Syuya
Ideguchi Yusuke
Hasebe Nobuyuki
Ogura Kouichi

Publication date

March 2012

Journal

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

Abstract

We verified that the two-step etching method of the combination of pre-etching with PEW (Potassium hydroxide + Ethanol + Water) solution and post-etching with NaOH solution makes drastic improvement of charge resolution for high Z/b particles (Z: nuclear charge, b: velocity) in CR-39 nuclear track detectors. Detectors were exposed to several heavy ions from Ne to Kr with the energies of <500 MeV/n at HIMAC(Heavy Ion Medical Accelerator in Chiba). The optimum etching conditions were determined to be a preetching of PEW solution with concentration of 60 wt% of ethanol for 40 min and a post-etching of 7N NaOH for 12 h. This resulted in a charge resolution for Kr (Z/b~60) of 0.18 c.u. (charge units). The Z/b detection threshold was increased as...

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Improvement of charge resolution for high Z/b particles in CR-39 nuclear track detectors by means of two-step etching technique

Abstract

Extracted data

Improvement of charge resolution for high Z/b particles in CR-39 nuclear track detectors by means of two-step etching technique

Abstract

Extracted data

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