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Descriptor English:   Isotopes 
Descriptor Spanish:   Isótopos 
Descriptor Portuguese:   Isótopos 
Tree Number:   D01.496
Definition English:   Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed) 
Indexing Annotation English:   for stable isotopes only; GEN: avoid as IM; NIM as coord; Manual 25.20+; m for metastable = RADIOISOTOPES or specific pre-coord radioisotope
See Related English:   Radioisotopes
History Note English:   74; was see under RADIOISOTOPES 1963-73 
Allowable Qualifiers English:  
AD administration & dosage AE adverse effects
AG agonists AN analysis
AI antagonists & inhibitors BL blood
CF cerebrospinal fluid CS chemical synthesis
CH chemistry CL classification
EC economics HI history
IM immunology IP isolation & purification
ME metabolism PK pharmacokinetics
PD pharmacology PO poisoning
RE radiation effects ST standards
SD supply & distribution TU therapeutic use
TO toxicity UR urine
Record Number:   7723 
Unique Identifier:   D007554 

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