INTERNAL BREMSSTRAHLUNG SPECTRUM ACCOMPANYING 1S ELECTRON CAPTURE IN DECAY OF Fe$sup 55$, Cs$sup 131$, AND Tl$sup 204$ (thesis)
The internal bremsstrahlung spectra in coincidence with the K x rays resulting from lS electron capture in Fe/sup 55/ and Cs/sup 131/ were measured. The shape of the coincidence spectra exhibits a maximum at the predicted energy and then drops off in intensity toward the lowenergy region. This is markedly different from that of the single bremsstrahlung spectrum which rises continuously toward the low-energy region. The agreement between the observed coincidence shape and that predicted by Glauber and Martin for the radiative capture of S electrons is excellent. In the case of Cs/sup 131/ I, the shape of the bremosstrahlung spectrum of the radiative capture of P electrons as obtained by subtracting from the total spectrum the spectrum due to S electron capture is also in good accord with that predicted. The experimental arrangement involves thin NaI crystals enclosed in thin Be or aluminum windowed containers and a fastslow coincidence circuit of resolving time varying from 10/sup -8/ to 10/sup - 7/ sec. The amount of coincident iodine x rays in the bremsstrahlung detector was estimated by supplementary measurements and was subtracted for the final results. The end point of the lS electron capture bremsstrahlung spectrum of Tl was also measured. (auth)
- Research Organization:
- Columbia Univ., New York
- NSA Number:
- NSA-14-008060
- OSTI ID:
- 4198267
- Report Number(s):
- CU-190
- Country of Publication:
- United States
- Language:
- English
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