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 00:00:00 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
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

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