Assertion: gamma ray's mass | /r/HasProperty | interposed along the line of sight
Facets:
value: between the radiation source
type: LOCATION
value: between the region
type: LOCATION
Source sentences:
text: The effectiveness of a material as a biological shield is related to its cross-section for scattering and absorption, and to a first approximation is proportional to the total mass of material per unit area interposed along the line of sight between the radiation source and the region to be protected.