Table 3

Exposure metrics by job category: instantaneous peak exposure levels, average exposure levels weighted for the duration of the shift (shift-weighted average; SWA) and average exposure levels weighted for the time exposed to SMF (exposure-weighted average; XWA)

B (mT)dB/dt (mT/s)
NobsNsubAMGMGSDBWGSDWWRangeAMGMGSDBWGSDWWRange
Occupation
Instantaneous peak exposure
 Radiographers116716955591.731.5937–289111317342.031.8337–12 455
 Other HCP26214672013.192.1627–189510802584.652.979–5968
 Medical433663371.411.23197–5583443051.211.63133–542
 Anaesthetists332561272.20–*20–570214984.3014–497
Total149986374486.371.5720–289110835747.341.809–12 455
SWA
 Radiographers1167118161.321.438–4816141.361.389–105
 Other HCP262122181.001.896–6417141.001.659–94
 Medical4320171.571.2710–3515141.431.019–21
 Anaesthetists3311101.595–1610101.079–11
Total1499819162.031.435–6416142.031.369–105
XWA
 Radiographers1167130281.231.3513–8920171.371.4010–124
 Other HCP262128241.001.6411–6420161.601.389–120
 Medical4326251.001.2618–3516161.281.0012–21
 Anaesthetists3316151.3511–2211111.129–12
Total1499829272.401.3311–8920172.171.399–124
  • *No within-participant repeats were available for anaesthetists.

  • AM, arithmetic mean; GM, geometric mean; GSDBW, between-participant geometric SD; GSDWW, within-participant geometric SD; HCP, healthcare professional; Nobs, number of observations; Nsub, number of individual participants; SMF, static magnetic fields.