Nuklida · stabil · alami
Kalsium-46 (⁴⁶Ca)
Kalsium-46 (⁴⁶Ca) adalah isotop stabil kalsium dengan 20 proton dan 26 neutron (nomor massa 46). Kelimpahan alaminya 0.000 04(3).
Data nuklida
- Unsur
- Kalsium (Ca, Z = 20)
- Nomor massa (A)
- 46
- Proton (Z)
- 20
- Neutron (N)
- 26
- Massa atom
- 45.953687726 ± 0.000002398 u
- Waktu paruh
- Stabil
- Mode peluruhan
- Peluruhan beta ganda
- Inti anak
- Titanium-46 (⁴⁶Ti)
- Kelimpahan alami
- 0.000 04(3)
- 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, ⁴⁷Ca, ⁴⁸Ca, ⁴⁹Ca, ⁵⁰Ca, ⁵¹Ca, ⁵²Ca, ⁵³Ca, ⁵⁴Ca, ⁵⁵Ca, ⁵⁶Ca, ⁵⁷Ca, ⁵⁸Ca, ⁵⁹Ca, ⁶⁰Ca, ⁶¹Ca