Accession Number:

AD0338330

Title:

GAMMA RATE VERSUS TIME

Descriptive Note:

Corporate Author:

DEFENSE ATOMIC SUPPORT AGENCY WASHINGTON DC

Personal Author(s):

Report Date:

1954-05-01

Pagination or Media Count:

34.0

Abstract:

Initial- andual-gamma rates were measured as a function of time at various distances from high-yield thermonuclear detonations. Initial gamma rate versus time was measured at fixed distances from ground zero. In particular, meas urements were made of the effect on initial-gamma rate caused by the passage of the shock front from ground zero through the detector station. Residual-gamma rate versus time was measured to provide gamma-radiation time-intensity data, which give information both on fallout rate of arrival and gamma-field-decay rate during the 36-hour period after the detonation. Scintilla tion detectors were used in making measurements. The instrument stations were self-contained-the only outside facilities required were timing signals to turn on the stations at a predeter mined time prior to the detonation. Data obtained indicate that the expanding fireball and the pas sage of the shock front from ground zero through the detector station had a marked effect on the initial-gamma rate-hence on the integrated ex posure. The initial-gamma rate reached its first peak immediately after the detonation, decreased slowly, began to rise slowly, and then increased rapidly to a second peak which was about the same value as the first peak. After reaching the second-peak value, the initial-gamma rate de creased rapidly to zero. Author

Subject Categories:

  • Radioactivity, Radioactive Wastes and Fission Products
  • Nuclear Physics and Elementary Particle Physics
  • Rocket Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE