Gynae BT 2017

Source specification

Previously, source strength specification was based on “contents” , # of desintegrations per time unit

• 1 Ci (3.7 x 10 10 s -1 ) activity of 1g Ra-226 • in SI-units: 1 desintegration per sec = 1 Bq example: 1 mCi = 37 MBq

Now, specification of sources is performed in terms of energy deposition, per unit of time at a given distance:

• in air kerma rate:  Gy . h -1 @ 1 m