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OPERATION SANDSTONE. Nuclear Explosions. 1948. Appendix B to Report Number 10. Fission Counting.
ATOMIC ENERGY COMMISSION WASHINGTON DC
The counting equipment consisted of a double ion-chamber filled with argon at a pressure of 2-3 cm of mercury above atmospheric, to each side of which two amplifier-scaler circuits were connected in parallel.
See also Appendix C, AD-A995 325.