Kia Orana and Welcome to our website! The Cook Islands Meteorological Service is a division of the Ministry of Transport. It is dedicated in providing you with the latest weather updates, forecasts and warnings for the Cook Islands. Since that first rainfall observation in 1899 in Rarotonga, more observations are now made so as to guide us to see what will happen tomorrow.
Definition of disallow. 1  transitive verb. 2  1 : to deny the force, truth, or validity of. 3  2 : to refuse to allow.
Half-value layer. the amount of absorbing material that will reduce the intensity of the primary beam to one-half its original value. an indirect measure of the total filtration in the path of the beam. HVL is expressed in terms of aluminum filtration equivalency.e.g. 2.0 mm Al/Eq.iltration also removes a portion of the useful beam. Has a visible effect on film density. When filtration is increased, technical factors must be increased to maintain the same IR exposure.