Method for detecting and correcting for isotope burn-in during l

Details Method for detecting and correcting for isotope burn-in during l Method for detecting and correcting for isotope burn-in during l

1986-08-18

1988-06-07

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Neutron responsive means

250391, 2504721, 376154, G01T 300

Patent

active

047498668

ABSTRACT:
A method is described for detecting and correcting for isotope burn-in during-long term neutron dosimetry exposure. In one embodiment, duplicate pairs of solid state track recorder fissionable deposits are used, including a first, fissionable deposit of lower mass to quantify the number of fissions occuring during the exposure, and a second deposit of higher mass to quantify the number of atoms of for instance .sup.239 Pu by alpha counting. In a second embodiment, only one solid state track recorder fissionable deposit is used and the resulting higher track densities are counted with a scanning electron microscope. This method is also applicable to other burn-in interferences, e.g., .sup.233 U in .sup.232 Th or .sup.238 Pu in .sup.237 Np.

REFERENCES:
patent: 3222521 (1965-12-01), Einfeld
patent: 3436538 (1969-04-01), Basdekas
patent: 3604931 (1971-09-01), Kastner et al.
Khan, Nuclear Instruments and Methods, I13, No. 1, Nov. 1973, p. 55.
Fleischer et al., Science, vol. 149, Jul. 23, 1965, p. 383.
Frank H. Ruddy, et al., "Standardized Physics-Dosimetry for U.S. Pressure Vessel Cavity Surveillance Programs," Fifth International ASTM-Euratom Symposium on Reactor Dosimetry, Geesthacht, HEDL-SA-3095, Sep. 1984.

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