Half-value layer (HVL) means the thickness of specified material which attenuates the beam of radiation to an extent such that the exposure rate is reduced to one-half of its original value. In this definition the contribution of all scattered radiation, other than any which might be present initially in the beam concerned, is deemed to be excluded.
Gross Calorific Value of “GCV” shall mean that quantity of heat expressed in Kilowatt- hour produced by the complete combustion of one (1) normal cubic metre of Natural Gas at twenty-five (25) degrees Celsius and an absolute pressure of one decimal zero one three two five (1.01325) bar with excess air at the same temperature and pressure as the Natural Gas when the products of combustion are cooled to twenty-five (25) degrees Celsius and when the water formed by combustion is condensed to the liquid state and the products of combustion contain the same total mass of water vapor as the Natural Gas and air before combustion.
SPS AER Value means the Underlying Reference Value.
RI Value means, in respect of a Reference Item and a ST Valuation Date, (i) the RI Closing Value for such Reference Item in respect of such ST Valuation Date, divided by (ii) the relevant RI Initial Value (expressed as a percentage).
Retail value of a prize means:
