GAMMA RATE VERSUS TIME
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1954
- Accession Number
- AD0338330
Entities
People
- Gerald Carp
- Peter T Brown