Screening out Obstructive Radiation from Thermoruminescence Sheets (BaSO_4 : Eu) Exposed to Cosmic Rays

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  • 宇宙線検出用熱ルミネセンスシート(BaSO_4:Eu)における妨害幅射光の除去
  • ウチュウセン ケンシュツヨウ ネツ ルミネセンス シート BASO4 EU ニオケル ボウガイ フクシャコウ ノ ジョキョ

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Abstract

We have investigted emission light characteristics of the thermoluminescence [TL]-sheet [BaSO_4 : Eu]. More, we have introduced the rejecting methods for the obstructive light [OL] of these sheets. [I] Signal light [SL] emission spectra due to high energy γ, β and cosmic rays irradiations were observed in ultra-violet regions (that peak is about 370 nm). [II] In the case of rough treatments of TL-sheets or locating them for long time, we observed the OL emission in addition to the SL emission. These OL spectra are two bands of 570 nm (yellow) and 450 nm (blue). [III] The OL emission due to the obstructive radiation [OR] is caused by surface phenomena concerned with O_2 for the TL-sheet [BaSO_4 : Eu]. [IV-1] The glow curves, in which the OR emission suppressed are obtained in a nitrogen atmosphere. [IV-2] By using moderate band pass filter, the OL can be cut easily. For high energy cosmic ray researches by using TL-sheets, these methods [IV-1,2] are effective as follows ; a) One can treat easily TL-sheets in large quantities. b) Deminishing backgrounds due to the OR emission, one can observe shower energies of lower threshold values.

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