I. A study of the excited states of /sup 187/Pt in the decay of /sup 187/Au (8. 4 min). II. The preparation of reactor-produced, carrier-free /sup 18/F for the synthesis of labeled organic compounds

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5747339

Gnade, B E

The decay of /sup 187/Au to /sup 187/Pt has been studied with mass separted sources from the UNISOR facility. Multiscaled spectra of ..gamma..-rays, x-rays and conversion electrons were obtained along with ..gamma..-..gamma..-t, ..gamma..-x-t, e/sup -/-..gamma..-t and e/sup -/-x-t coincidence data. The half-life of /sup 187/Au was measured to be 8.4 +/- 0.3 min. A decay scheme consisting of 56 excited states and 245 transitions that incorporates 88% of the decay intensity assigned to /sup 187/Au has been constructed. The i/sub (13/2)/ band in /sup 187/Pt is populated through low-spin band members in approximately 4% of the decays of /sup 187/Au. Levels of 260, 288, and 507 keV are found to de-excite by EO transitions. The ground-state decay energy is deduced to be Q/sub EC/ = 3.90 +/- 0.15 MeV from a ..gamma..-gated ..beta../sup +//EC ratio. The positive parity states in /sup 187/Pt are compared with calculations made with the Lund Model (Larsson et al., 1978). An anion exchange and distillation procedure has been described for preparing reactor-produced carrier-free /sup 18/F as K/sup 18/F complexed with 18-crown-6 in acetonitrile for subsequent synthesis of labelled organic compounds. The reaction sequence /sup 6/Li(n,t) /sup 4/He - /sup 16/O(t,n) /sup 18/F produced yields of approximately 250 mCi or /sup 18/F per hour per gram of 96% enriched /sup 6/Li, as /sup 6/LiOH.H/sub 2/O target, in a reactor thermal neutron flux of 3 x 10/sup 13/n cm/sup -2/ sec/sup -1/. Yields of tritium-free carrier-free /sup 18/F dissolved in the crown ether solution typically reach 85 +/- 5 within the 45 minutes required for the radiochemical procedure.

• Research Organization: Georgia Inst. of Tech., Atlanta (USA)
• OSTI ID: 5747339
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400703 -- Radiochemistry & Nuclear Chemistry-- Radioisotope Production
651822* -- Nuclear Properties & Reactions
A=150-189
Experimental-- Radioactive Decay-- (-1987)
651823 -- Nuclear Properties & Reactions
A=150-189
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHEMICAL PREPARATION
COINCIDENCE METHODS
COUNTING TECHNIQUES
DATA
DECAY
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FLUORINE 18
FLUORINE ISOTOPES
GAMMA SPECTRA
GOLD 187
GOLD ISOTOPES
HALF-LIFE
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INFORMATION
ISOTOPES
LABELLED COMPOUNDS
LIGHT NUCLEI
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
PLATINUM 187
PLATINUM ISOTOPES
RADIOISOTOPES
SPECTRA
SYNTHESIS