RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 66 , Issue 1
Showing 1-5 articles out of 5 articles from the selected issue
Article
Technical Report
  • Takao Kawano, Yoshiaki Ando, Yuuichi Izumi
    2017 Volume 66 Issue 1 Pages 11-20
    Published: January 15, 2017
    Released: January 15, 2017
    JOURNALS OPEN ACCESS

    “Zuiki” is the stem of a taro plant containing natural radioactive potassium-40. Several zuiki stems were peeled, dried, and micronized; then, the compression and formation method was used to make ten disk-shaped sources. These sources were measured as to their weight, thickness, diameter, and radiation count (using a GM-survey meter). The counted radiation was mainly attributed to β-rays from 40K. The averages (SD’s) of the weight, thickness, diameter, and radiation count were 15.1(0.03) g, 9.98(0.1) mm, 35.2(0.01) mm and 163.4(10.5) cpm, respectively. The usability of the sources for educational purposes was examined in three tests on the dependence of the radiation count versus time, distance, and shielding. Furthermore, the statistical fluctuation of the radiation counts was examined by making 50 measurements. It was concluded that the zuiki radiation sources were useful for demonstrating the three principles of radiation protection and the statistical fluctuation of radiation counts.

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Materials (Data)
Review Article
  • Shoji Asai
    2017 Volume 66 Issue 1 Pages 43-54
    Published: January 15, 2017
    Released: January 15, 2017
    JOURNALS OPEN ACCESS

    The Higgs Boson was discovered at LHC (Large Hadron Collider) in 2012 and Theorists proposed BEH mechanize won the Novel Prize of Physics in 2013. Why the Higgs boson is so important? The Higgs boson is not ordinary elementary particles such as electron or photon, (composite matter or mediate force). The Higgs boson is a clear evidence that our vacuum is fulfilled with a strange filed with weak charge. This filed works as “the origin of mass” and “origin of evolution of our Universe”. Spontaneous change of the field makes phase transition of our Universe, In this article, I introduce “how to produce and detect the Higgs boson?” and also give the short introduction of Supersymmetry, which is the next main target of LHC.

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