Nuklida · radioaktif · alami
Kalsium-48 (⁴⁸Ca)
Kalsium-48 (⁴⁸Ca) adalah isotop radioaktif kalsium dengan 20 proton dan 28 neutron (nomor massa 48). Waktu paruhnya 56 kuintiliun tahun (± 10 kuintiliun tahun), meluruh terutama lewat peluruhan beta ganda. Kelimpahan alaminya 0.001 87(21).
Data nuklida
- Unsur
- Kalsium (Ca, Z = 20)
- Nomor massa (A)
- 48
- Proton (Z)
- 20
- Neutron (N)
- 28
- Massa atom
- 47.952522654 ± 0.000000018 u
- Waktu paruh
- 56 kuintiliun tahun (± 10 kuintiliun tahun)
- Mode peluruhan
- Peluruhan beta ganda, Peluruhan beta minus (β⁻)
- Inti anak
- Titanium-48 (⁴⁸Ti), Skandium-48 (⁴⁸Sc)
- Kelimpahan alami
- 0.001 87(21)
- Tahun penemuan
- 1938
- Sumber data
- IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem
Kegunaan isotop kalsium
- Stable isotopes of calcium (42Ca, 44Ca, 46Ca, and 48Ca) and radioisotopes of calcium (45Ca and 47Ca, with a half-life of 109 h) can be used for tracing calcium uptake, utilization, and excretion in the body. For example, most of our knowledge on the efficiency by which calcium is absorbed in the intestine (bioavailability) comes from studies in which calcium in the diet was labeled with stable or radioactive isotopes. In such studies, the isotope-labeled food is ingested and fecal matter tested for the presence and quantity of unabsorbed isotope. When coupling oral ingestion of food labeled with one calcium isotope with an intravenous injection of a second calcium isotope, this technique can be used as a means to measure calcium absorption within the body by measuring excretion of both tracers in the urine. In a similar fashion, dietary absorption of magnesium and zinc can be studied,. Stable and radioactive isotopes are used in biomedical research and clinical practice to study disorders associated with calcium metabolism, in particular in relation to bone health and calcium accumulation in body tissues (vascular calcification, kidney stone formation). Stable isotope tracers have been used successfully to study bone calcium balance during space-flight and in-bed-rest studies. A long-living calcium radioisotope (41Ca), with a half-life of 9.9×104 years, has been used successfully for labeling of bone calcium to measure bone calcium turnover via urinary excretion of the tracer.
Isotop kalsium lainnya
³³Ca, ³⁴Ca, ³⁵Ca, ³⁶Ca, ³⁷Ca, ³⁸Ca, ³⁹Ca, ⁴⁰Ca, ⁴¹Ca, ⁴²Ca, ⁴³Ca, ⁴⁴Ca, ⁴⁵Ca, ⁴⁶Ca, ⁴⁷Ca, ⁴⁹Ca, ⁵⁰Ca, ⁵¹Ca, ⁵²Ca, ⁵³Ca, ⁵⁴Ca, ⁵⁵Ca, ⁵⁶Ca, ⁵⁷Ca, ⁵⁸Ca, ⁵⁹Ca, ⁶⁰Ca, ⁶¹Ca