EXPOSURE RATE constants and lead shielding thicknesses are needed by many for routine calculations in radiation safety, medical uses of radionuclides, and other applica-tions.
Each gamma emitting radionuclide has its own unique specific gamma ray constant. The specific gamma ray constant is the exposure rate at a specified distance from a specified activity of the nuclide. These constants are usually looked up in tables, but they can be calculated if necessary.
Radiation exposure - Wikipedia
where F is the exposure rate, r is the distance, α is the source activity, and Γ is the exposure rate constant, which is dependent on the particular radionuclide used as the gamma ray source. Below is a table of exposure rate constants for various radionuclides.
The exposure rate constant is defined as the ratio of the product of the exposure rate and the square of the distance from a radioactive point source to the source
Table of Exposure Rate Constants and Dose Equivalent Rate Constants
The exposure rate constant r is calculated and tabulated for 1084 nuclides. The exposure rate constant is defined as the ratio of the product of the exposure rate and the square of the distance from a radioactive point source to the source strength Q.
The units for exposure rate constant are: R cm / (mCi h)2 The exposure rate constant is a measure of the amount of energy released due to ionization by gamma rays and/or X-rays from a particular source, and takes into account the relative intensities and …
To determine Gamma Dose, we must first calculate “Exposure” (R) of The photons in air. What is the Dose Rate to a person who sits 30 cm from 10 microcuries of 32P ? (Assume there is no shielding from air or the source vial) What is the dose incurred by …
The unshielded gamma ray dose-equivalent rate at 1 meter from a point source, i.e., the specific gamma ray dose constant, is a useful quantity in radiation protection applications.
Exposure (PSE), an infrequent exposure for a special, high-dose job. The yearly limit is equal to the annual limit with a lifetime maximum of 5 times the annual limit. For example, the PSE limit for the whole body is 5 rems in a year, in addition to the above occupation limits, with a lifetime maximum of 25 rems.
Exposure rate constants and lead shielding values for over …
The authors have assembled a compilation of exposure rate constants, ƒ-factors, and lead shielding thicknesses for more than 1,100 radionuclides described in ICRP Publication 107.