Environmental RadiationAn array of thermoluminescent dosimeters (TLDs) is distributed throughout the Eastern Snake River Plain to monitor for environmental radiation (Figure 13). TLDs are changed out in May and again in November after six months in the field. The results of the November sampling (the period from May 2002 to May November 2002) are discussed below.
Dosimeter locations are divided into Boundary and Distant groupings. Boundary average exposure rates ranged from a low of 0.28 mR/day at Blue Dome to a high of 0.37 mR/day at Mud Lake. The overall average exposure was 0.33 mR/day. The Distant group had a low of 0.30 mR/day at Jackson, Wyoming and a high of 0.41 mR/day at Rexburg. The overall average Distant exposure was also 0.33 mR/day. There was no statistical difference between Boundary and Distant locations. Furthermore, all values are in line with past readings. Table 5 lists the range and average activity for both groups over a six-month period. All results are listed in Appendix C, Table C-14.
Table 5. TLD Exposures from May 2002 to
November 2002.
|
||||||||||||||||||||
