The HF will always be less than or equal to one ( it is only equal to one in the case of a monoenergetic beam ).
2.
A similar concept is the tenth-value layer or TVL . The TVL is the average amount of material needed to absorb 90 % of all radiation, i . e ., to reduce it to a tenth of the original intensity . 1 TVL is greater than or equal to log 2 ( 10 ) or approximately 3.32 HVLs, with equality achieved for a monoenergetic beam.
मोबाइल