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.

We propose a radiation education curriculum for training science teachers of junior and senior high schools suitable for the classroom. In this curriculum-included are the γ-ray spectroscopy of ⁴⁰K in a concrete wall and the measurements of γ-ray transmissivity in materials by means of a CdZnTe detector. The CdZnTe detector is inexpensive, compact and user-friendly, and applicable to experiments in the course of the training.

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.

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.

The accident of the Tokyo Electric Power Company’s Fukushima Dai-ichi Nuclear Power Plant widely effected an environmental contamination by radionuclides. No legal framework was prepared on remediation before the accident. Full-scale remediation started after putting the Act on Special Measured concerning the Handling of Pollution by Radioactive Materials in force on January, 2012. This paper describes activities before initiating a full-scale remediation, decontamination guideline, implementation of remediation and verification of results, and storage of contaminated materials arising from remediation with stating lessons learned.