Nuklida · radioaktif
Sesium-137 (¹³⁷Cs)
Sesium-137 (¹³⁷Cs) adalah isotop radioaktif sesium dengan 55 proton dan 82 neutron (nomor massa 137). Waktu paruhnya 30,04 tahun (± 0,04 tahun), meluruh terutama lewat peluruhan beta minus (β⁻).
Data nuklida
- Unsur
- Sesium (Cs, Z = 55)
- Nomor massa (A)
- 137
- Proton (Z)
- 55
- Neutron (N)
- 82
- Massa atom
- 136.907089296 ± 0.000000324 u
- Waktu paruh
- 30,04 tahun (± 0,04 tahun)
- Mode peluruhan
- Peluruhan beta minus (β⁻) ( 100 %)
- Inti anak
- Barium-137 (¹³⁷Ba)
- Tahun penemuan
- 1951
- Sumber data
- IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem
Kegunaan isotop sesium
- 137Cs (with a half-life of 30 years) can be used as a tracer in fungal mycelia (an extensive matrix of underground hyphae (stems of growth from a fungus)) to monitor the immobilization of this radioactive caesium isotope. After the nuclear reactor accident at Chernobyl, large quantities of 137Cs were released as fission products into the environment. Areas with large fungal populations and fungal mycelia seemed to immobilize the 137Cs isotope, which limited the spread of the radioactive isotope,.
- River floodplains are an important site for storing suspended sediments and contaminants transferred from upstream catchments. 137Cs measurements of floodplain sediments provide a technique for estimating overbank sediment deposition, and it can provide information on spatial patterns of sediment deposition (Fig. IUPAC.55.1),,.
- Nuclear fission of 235U (or other fissionable materials) yields 137Cs as a product. Although 137Cs is not naturally present in the environment, it can be collected from nuclear reactor processing and then used as an environmental tracer. 137Cs adheres tightly to porous sediments and will follow the movement of the sediment. By exposing sediments to 137Cs and allowing this combination to move dynamically, gamma ray spectrometry can then be used to measure the activity of 137Cs and monitor the movement of the radioactive sediments,,. 137Cs dating of sediments not older than 60 years is useful in natural and artificial lakes and other environments because of its widespread production and release during atmospheric nuclear weapons testing, which began in the late 1940s, plus subsequent releases, such as during the accident at the Chernobyl nuclear reactor in April 1986. The 137Cs concentration profile in a sediment core can be matched with the historical record of 137Cs release to determine the approximate age profile of the sediment,.
- High-energy gamma rays from 137Cs serve as food irradiation devices to remove bacteria and other harmful microorganisms (living single celled organisms such as virus, algae and fungus) from food. Although 137Cs is not used commercially for large-scale food irradiation, it has been proposed that it can be used this way. Gamma rays from the radioactive 137Cs destroy the DNA of organisms to enable foods to last longer (i.e. irradiation of fruits and vegetables stops the ripening process) and be contamination free,.
Isotop sesium lainnya
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