Assertion: gamma ray's source | /r/AtLocation | figure
Facets:
Source sentences:
text: The natural background levels (82%) shown in Figure 1-1 include the radon, terrestrial, cosmic, and natural internal sources shown in Figure 1-2.
text: Since the percentages shown in Figure 2 are averages, half of the population will receive greater doses and half will receive smaller doses from the several sources shown in the figure.