RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 66 , Issue 12
Showing 1-5 articles out of 5 articles from the selected issue
Article
  • Keisuke Yoshinami, Masashi Kaneko, Hiroki Yasuhara, Satoru Nakashima
    2017 Volume 66 Issue 12 Pages 625-632
    Published: December 15, 2017
    Released: December 15, 2017
    JOURNALS OPEN ACCESS

    Iron(II) assembled complexes [Fe(NCX)2(L)2] (X=S, Se and BH3; L=2,5-dimethyl-1,4-bis(4-pyridyl)benzene (dmbpb) and 2,3,5,6-tetramethyl-1,4-bis(4-pyridyl)benzene (tmbpb)) were synthesized to investigate the effect of substituent on the spin crossover (SCO) behavior. PXRD revealed that the structure is different between dmbpb and tmbpb complexes, while the structures are independent of anionic ligands. 57Fe Mӧssbauer spectroscopy and magnetic susceptibility measurement revealed that the SCO occurs in the case of [Fe(NCSe)2(dmbpb)2] and [Fe(NCBH3)2(dmbpb)2] but the SCO is not observed in other complexes. The quadrupole splitting (Q.S.) value in high-spin state decreased in the order of S>Se>BH3 for dmbpb complexes but S>BH3>Se for tmbpb complexes. It was suggested that electron distribution is different between dmbpb and tmbpb complexes. Transition temperature for [Fe(NCBH3)2(dmbpb)2] was 128 K, which is lower than that of the corresponding complex bridged with 1,4- bis(4-pyridyl)benzene.

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Review Articles
  • Hiromichi Fumoto
    2017 Volume 66 Issue 12 Pages 641-693
    Published: December 15, 2017
    Released: December 15, 2017
    JOURNALS OPEN ACCESS

    Radioactive waste disposal scheme was reviewed in terms of practice in waste disposal with regards to the naturally occurring radioactive materials, which exist in our natural environment. Moreover, the De Minimis concepts once we shared with as trivial activities in 1980’s, which discussed in international community to be a concept of exemption and later of clearance. Finally, the legislation in foreign countries in waste disposal, exemption, clearance was reviewed in comparison to the nature of uranium and other naturally occurring radioactive materials in environment.

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  • Tetsuo Akimoto
    2017 Volume 66 Issue 12 Pages 695-700
    Published: December 15, 2017
    Released: December 15, 2017
    JOURNALS OPEN ACCESS

    It is good news for us that radium dichloride which is an α emitter radionuclide was approved in Japan as a treatment option for the metastatic castration-resistant prostate cancer. Impairment of the quality of life due to the bone metastasis is a big problem, and you should avoid especially in patients with prostate cancer because natural history and progress of prostate cancer are relatively slow even if bone metastases occurs. In addition, the appearance of the therapeutic option that extends duration of survival in addition to the reduction of skeletal related event (SRE) has a positive impact on treatment modalities for castration resistance prostate cancer. As described, there is still the problems that should be resolved for the establishment of optimal usage of radium dichloride in management of castration resistance prostate cancer with bone metastasis.

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