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Descriptor in English: Technetium
Descriptor in Spanish: Tecnecio
Descriptor in Portuguese: Tecnécio
Descriptor in French: Technétium
Entry term(s): 99m, Technetium
Technetium 99m
Tree number(s): D01.268.271.870
D01.268.556.843
D01.268.956.875
D01.496.749.305.870
D01.552.544.843
Scope note: The first artificially produced element and a radioactive fission product of URANIUM. Technetium has the atomic symbol Tc, and atomic number 43. All technetium isotopes are radioactive. Technetium 99m (m=metastable) which is the decay product of Molybdenum 99, has a half-life of about 6 hours and is used diagnostically as a radioactive imaging agent. Technetium 99 which is a decay product of technetium 99m, has a half-life of 210,000 years.
Annotation: note entry term: many specific Technetium Tc 99m terms are available
Allowable Qualifiers: AD administration & dosage
AE adverse effects
AN analysis
BL blood
CF cerebrospinal fluid
CH chemistry
CL classification
EC economics
HI history
IP isolation & purification
ME metabolism
PD pharmacology
PK pharmacokinetics
PO poisoning
SD supply & distribution
ST standards
TO toxicity
TU therapeutic use
UR urine
See also the descriptors: Organotechnetium Compounds MeSH
DeCS UI: 29561
Descriptor UI: D013667
Date Established: 1966/01/01
Date of Entry: 1999/01/01
Revision Date: 2017/04/25
Technetium - Preferred
Concept UI M0021093
Scope note The first artificially produced element and a radioactive fission product of URANIUM. Technetium has the atomic symbol Tc, and atomic number 43. All technetium isotopes are radioactive. Technetium 99m (m=metastable) which is the decay product of Molybdenum 99, has a half-life of about 6 hours and is used diagnostically as a radioactive imaging agent. Technetium 99 which is a decay product of technetium 99m, has a half-life of 210,000 years.
Preferred term Technetium
Technetium 99m - Narrower
Concept UI M0021094
Preferred term Technetium 99m
Entry term(s) 99m, Technetium



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