a-b   |   c   |   d-f   |   g-j   |   k-m   |   n-p   |   r-s   |   t-z

AC or alternating current Electrical circuits where the voltage and current alternate direction, in the UK at 50 times per second (50 herz or Hz) and in the USA at 60 Hz

ACGIH American Conference of Governmental and Industrial Hygienists. An American body which has produced advisory occupational exposure guidelines.

AGNIR The NRPB’s Advisory Group on Non-Ionising Radiation, formerly chaired by Sir Richard Doll

ALL Acute Lymphoblastic Leukaemia (sometimes alternatively called Acute Lymphocytic Leukaemia), the commonest type of childhood leukaemia

ALS Amyotrophic Lateral Sclerosis, a form of neurodegenerative disease. Known in the USA as Lou Gehrig’s disease.

Amps (or amperes) The unit of electrical current, symbol A

Athermal Strictly speaking, effects which do not stem from the heating effect of a field, because the field is too low to cause significant heating. At power frequencies heating is usually not important, and athermal is often used to refer to effects below the level at which induced-current effects are recognised as significant.

B Usual symbol for the magnetic flux density or more generally the magnetic field

Bioinitiative A report written on EMFs in 2007

Bradford-Hill criteria A widely accepted set of pointers to help decide whether epidemiological results have established a causal effect or not

BSI British Standards Institute