A double ionization chamber for the differential method

doi:10.1016/S0029-554X(79)94420-3

Nuclear Instruments and Methods

Volume 158, January 1979, Pages 435-441

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A double ionization chamber for the differential method has been constructed, by which a minute difference in intensities (1 part in 10⁵) of two γ-ray sources can be measured with the aid of a conventional sampling method. By the use of this chamber, the effect of superconductivity on the nuclear decay rate λ of ^99mTc has been measured, but no effect was found within an experimental error Δλ/λ = (0.2±0.5) × 10⁻⁴. This result is consistent with our previous result, but is in essential disagreement with that of Byers and Stump. Another application of the device for determination of a long half-life is also demonstrated. The half-life of ⁶⁰Co was determined in a 10 d measurement as T_½ = (5.27±0.07)y, which is in excellent agreement with the current value.

References (10)

E. Rutherford
Wien, Ber.
(1911)
G.T. Emery
Ann. Rev. Nucl. Sci.
(1972)
H. Mazaki et al.
Z. Physik B
(1978)
R. Sellam et al.
E. Segré
Phys. Rev.
(1947)

There are more references available in the full text version of this article.

Cited by (3)

A differential ionization chamber for the determination of small differences in decay rates of beta emitters
1979, Nuclear Instruments and Methods
A differential ionization chamber for measurements of small changes in the rate of decay of pure beta emitters has been constructed. The characteristics of the chamber were studied for various experimental conditions. The apparatus can be used for the determination of relative changes in the radioactive decay constant Δγ/γ in the order of 10⁻⁴ − 10⁻⁵, which can be caused by different chemical states of the beta emitter. The methods used for checking the operation of the apparatus are illustrated.
Effect of chemical state on the decay constant of Tcm99
1980, Physical Review C
Superconducting transition of electrodeposited technetium
1979, Physical Review B

^*: Present address: Ambassade de France au Japon, 11-44, 4-chome, Minatoku, Tokyo, 106, Japan.

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A double ionization chamber for the differential method

Wien, Ber.

Ann. Rev. Nucl. Sci.

Z. Physik B

Phys. Rev.