Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays

S. Kodaira; N. Yasuda; H. Kawashima; M. Kurano; Nobuyuki Hasebe; T. Doke; S. Ota; K. Ogura

doi:10.1016/j.radmeas.2009.10.057

Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays

S. Kodaira^*, N. Yasuda, H. Kawashima, M. Kurano, Nobuyuki Hasebe, T. Doke, S. Ota, K. Ogura

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

It is necessary to develop a track detector with higher detection threshold and high charge resolution for ultra heavy cosmic ray observation. The track registration sensitivity in CR-39 track detector etched by PEW (Potassium-Ethanol-Water) solution was verified using heavy ion beams at the HIMAC accelerator. It was found that PEW solution makes effectively to desensitize the track registration sensitivity in CR-39 detector. Its detection threshold of Z^*/β is successfully raised to be Z^*/β = 39 by using PEW solution with the concentration of ethanol of 45 wt%. However this produces a "fuzzy track". A two-step process of etching involving a post-etch with 7 mol/l sodium hydroxide solution produced very clear track edges and remarkably improves the charge resolution for heavy ions.

Original language	English
Pages (from-to)	861-864
Number of pages	4
Journal	Radiation Measurements
Volume	44
Issue number	9-10
DOIs	https://doi.org/10.1016/j.radmeas.2009.10.057
Publication status	Published - 2009 Oct

Keywords

CR-39 track detector
Detection threshold
Galactic cosmic rays
PEW etching solution
Response curve
Ultra heavy nuclei

ASJC Scopus subject areas

Radiation
Instrumentation

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10.1016/j.radmeas.2009.10.057

Cite this

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title = "Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays",

abstract = "It is necessary to develop a track detector with higher detection threshold and high charge resolution for ultra heavy cosmic ray observation. The track registration sensitivity in CR-39 track detector etched by PEW (Potassium-Ethanol-Water) solution was verified using heavy ion beams at the HIMAC accelerator. It was found that PEW solution makes effectively to desensitize the track registration sensitivity in CR-39 detector. Its detection threshold of Z*/β is successfully raised to be Z*/β = 39 by using PEW solution with the concentration of ethanol of 45 wt%. However this produces a {"}fuzzy track{"}. A two-step process of etching involving a post-etch with 7 mol/l sodium hydroxide solution produced very clear track edges and remarkably improves the charge resolution for heavy ions.",

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AU - Kodaira, S.

AU - Yasuda, N.

AU - Kawashima, H.

AU - Kurano, M.

AU - Hasebe, Nobuyuki

AU - Doke, T.

AU - Ota, S.

AU - Ogura, K.

PY - 2009/10

Y1 - 2009/10

N2 - It is necessary to develop a track detector with higher detection threshold and high charge resolution for ultra heavy cosmic ray observation. The track registration sensitivity in CR-39 track detector etched by PEW (Potassium-Ethanol-Water) solution was verified using heavy ion beams at the HIMAC accelerator. It was found that PEW solution makes effectively to desensitize the track registration sensitivity in CR-39 detector. Its detection threshold of Z*/β is successfully raised to be Z*/β = 39 by using PEW solution with the concentration of ethanol of 45 wt%. However this produces a "fuzzy track". A two-step process of etching involving a post-etch with 7 mol/l sodium hydroxide solution produced very clear track edges and remarkably improves the charge resolution for heavy ions.

AB - It is necessary to develop a track detector with higher detection threshold and high charge resolution for ultra heavy cosmic ray observation. The track registration sensitivity in CR-39 track detector etched by PEW (Potassium-Ethanol-Water) solution was verified using heavy ion beams at the HIMAC accelerator. It was found that PEW solution makes effectively to desensitize the track registration sensitivity in CR-39 detector. Its detection threshold of Z*/β is successfully raised to be Z*/β = 39 by using PEW solution with the concentration of ethanol of 45 wt%. However this produces a "fuzzy track". A two-step process of etching involving a post-etch with 7 mol/l sodium hydroxide solution produced very clear track edges and remarkably improves the charge resolution for heavy ions.

KW - CR-39 track detector

KW - Detection threshold

KW - Galactic cosmic rays

KW - PEW etching solution

KW - Response curve

KW - Ultra heavy nuclei

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Control of the detection threshold of CR-39 PNTD for measuring ultra heavy nuclei in galactic cosmic rays

Abstract

Keywords

ASJC Scopus subject areas

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