Jpn. J. Appl. Phys. 51 (2012) 048003 (2 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Brief Note

Complementary Characterization of Radioactivity Produced by Repetitive Laser-Driven Proton Beam Using Shot-to-Shot Proton Spectral Measurement and Direct Activation Measurement

Koichi Ogura^1,2, Toshiyuki Shizuma^1,2, Takehito Hayakawa^1,2, Akifumi Yogo², Mamiko Nishiuchi^1,2, Satoshi Orimo^1,2, Akito Sagisaka^1,2, Alexander Pirozhkov^1,2, Michiaki Mori^1,2, Hiromitsu Kiriyama^1,2, Shuhei Kanazawa^1,2, Shuji Kondo^1,2, Yoshiki Nakai^1,2, Takuya Shimomura¹, Manabu Tanoue¹, Hajime Sasao¹, Daisuke Wakai¹, Fumitaka Sasao¹, Hajime Okada¹, Toyoaki Kimura¹, Yuji Oishi³, Takuya Nayuki³, Takashi Fujii³, Koshichi Nemoto³, and Hiroyuki Daido^1,4

(Received September 14, 2011; accepted January 14, 2012; published online March 16, 2012)

The precision of the time-of-flight method for measuring proton spectra is confirmed by the activation method using a ⁷Li(p,n)⁷Be nuclear reaction. The proton beam driven by a repetitive high-intensity laser is utilized to induce the nuclear reaction. The activity measured by direct gamma-ray measurement after 1912 proton beam shots at 1 Hz is 1.7±0.2 Bq. This is in accordance with the activity of 1.6±0.2 Bq obtained from the shot-to-shot proton energy distribution measured using the time-of-flight detector.

URL: http://jjap.jsap.jp/link?JJAP/51/048003/
DOI: 10.1143/JJAP.51.048003

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