Syntax:
DECAY: BGDR={absorbed dose rate (Gy/hour)}
Example:
DECAY: BGDR=1000 !1,000 Gy/hour (inside a PWR containment vessel???)
Purpose: Set the instantaneous absorbed dose rate that arises from environmental sources of radiation (e.g., cosmic rays, -rays from the ground and buildings, radon, and 14C and 40K inside the human body).
Data Type: real
Unit: Gy/hour
Default: 0.0
Comments: The average annual dose rate from background radiation in the U.S. is 3.0 mGy/year (NCRP 1987). In other regions of the world, the dose rate from background radiation may vary as much as 10-fold (UNSCEAR 2000). Dose rates of 1, 2 and 3 mGy/year correspond to dose rates of 1.1408E-07, 2.2815E-07, and 3.4223E-07 Gy/hour, respectively. References NCRP (National Council on Radiation Protection and Measurements). 1987. Ionizing Radiation Exposure of the Population of the United States. NCRP Report 93, Bethesda, MD. UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation). 2000. Sources and effects of ionizing radiation, Vol. II: Effects. UNSCEAR 2000 Report to the General Assembly.
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