Comparative Evaluation of Coffee Block Radiation Sources Fabricated from 10 Different Instant Coffees

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  • 10種のインスタントコーヒーで作るコーヒーブロック線源の比較評価
  • 10シュ ノ インスタントコーヒー デ ツクル コーヒーブロックセン ゲン ノ ヒカク ヒョウカ

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Abstract

Instant coffee contains natural potassium-40 and is a very comprehensible educational tool for illustrating naturally existing radiations and radioisotopes because potassium-40 emits radiations. In the present study, a compression and formation method was applied to 10 varieties of commercially available instant coffees and 10 coffee block radiation sources were fabricated. Thus fabricated radiation sources were examined by comparing their dimensions(side length and thickness), weights and radioactivity of 40K. For comparison, radioactivity of 40K contained in 6 varieties of commercially available regular coffees was also measured. It was found that the dimensions and weights of the fabricated radiation sources did not significantly vary by difference of instant coffees, and the average radioactivity of 40K contained in the 10 coffee block radiation sources was 16.6Bq, being about 1.7times more intensive than that of regular coffees.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 64 (12), 737-744, 2015

    Japan Radioisotope Association

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