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The eye lens exposure among 16 technicians in two nuclear medicine departments at university hospitals in Finland was investigated by measuring the operational quantity H p (3) using EYE-D dosemeters. For all workers, the annual mean H p (3) was estimated to be 1.1 mSv (max. 3.9 mSv). The relation between H p (3) to routinely monitored personal dose equivalent H p (10) was clearly correlated. Considering individual dose measurement periods (2–4 weeks), the H p (3)/H p (10) ratio was 0.7 (Pearson’s coefficient  r  = 0.90,  p  &lt; 0.001, variation of ratio 0.1–2.3). The variation decreased considerably with increasing H p (10) ( σ  2  = 0.04 vs. 0.43 for H p (10) &gt; 0.1 mSv vs. &lt; 0.1 mSv, respectively), i.e. higher H p (10) predicts H p (3) more reliably. Moreover, annual H p (10) data from national dose register during 2009–2018 were used to derive the annual H p (3) applying the H p (3)/H p (10) ratio. The data from Finnish nuclear medicine departments imply that routine measurements of H p (3) among nuclear medicine technicians are not justified.

ESTIMATION OF H P (3) AMONG STAFF MEMBERS IN TWO NUCLEAR MEDICINE UNITS IN FINLAND