Nuklida · radioaktif
Prometium-147 (¹⁴⁷Pm)
Prometium-147 (¹⁴⁷Pm) adalah isotop radioaktif prometium dengan 61 proton dan 86 neutron (nomor massa 147). Waktu paruhnya 2,6234 tahun (± 0,0002 tahun), meluruh terutama lewat peluruhan beta minus (β⁻).
Data nuklida
- Nomor massa (A)
- 147
- Proton (Z)
- 61
- Neutron (N)
- 86
- Massa atom
- 146.915144944 ± 0.000001382 u
- Waktu paruh
- 2,6234 tahun (± 0,0002 tahun)
- Mode peluruhan
- Peluruhan beta minus (β⁻) ( 100 %)
- Inti anak
- Samarium-147 (¹⁴⁷Sm)
- Tahun penemuan
- 1947
- Sumber data
- IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem
Kegunaan isotop prometium
- The beta-particle-emitting isotope 147Pm (with a half-life of 2.68 years) is used in the nuclear fuel industry to measure the thickness of the inner surface layer of graphite in the cladding tube where the nuclear fuel rod is placed in a nuclear fuel reactor (Fig. IUPAC.61.1). The graphite serves as a protective layer against mechanical contact between the nuclear fuel rod and the Zircaloy cladding (fuel-rod holding tube) and as a diffusion barrier against fission products. By placing a layer of 147Pm along the inner surface of the cladding before the graphite, the long half-life of 147Pm and constant beta-particle emission provide a reliable and simple technique to measure the thickness of the graphite along the inner surface of the tube (called the beta-ray backscatter technique),,. The beta decay property of 147Pm makes this radioisotope an ideal candidate for nuclear batteries (beta voltaics). Long-lived power supplies for remote and sometimes hostile environmental conditions are needed for space and sea missions, and nuclear batteries can uniquely serve this role. A nuclear battery using beta voltaics can have an energy density (quantity of energy per unit mass) near a thousand watt-h per kilogram with 21 percent efficiency, which is much greater than the best chemical batteries.
Isotop prometium lainnya
¹²⁶Pm, ¹²⁷Pm, ¹²⁸Pm, ¹²⁹Pm, ¹³⁰Pm, ¹³¹Pm, ¹³²Pm, ¹³³Pm, ¹³⁴Pm, ¹³⁵Pm, ¹³⁶Pm, ¹³⁷Pm, ¹³⁸Pm, ¹³⁹Pm, ¹⁴⁰Pm, ¹⁴¹Pm, ¹⁴²Pm, ¹⁴³Pm, ¹⁴⁴Pm, ¹⁴⁵Pm, ¹⁴⁶Pm, ¹⁴⁸Pm, ¹⁴⁹Pm, ¹⁵⁰Pm, ¹⁵¹Pm, ¹⁵²Pm, ¹⁵³Pm, ¹⁵⁴Pm, ¹⁵⁵Pm, ¹⁵⁶Pm, ¹⁵⁷Pm, ¹⁵⁸Pm, ¹⁵⁹Pm, ¹⁶⁰Pm, ¹⁶¹Pm, ¹⁶²Pm, ¹⁶³Pm, ¹⁶⁴Pm, ¹⁶⁵Pm