primary rays

pri·mar·y rays

1. cosmic rays in the form in which they first strike the atmosphere;
2. x-rays generated at the focal spot of the tube. Synonym(s): direct rays
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Shaded in different hues, the seven shirt designs are made to suit all kinds of Filipino, with each shirt featuring a floral accent, from tropical-printed shirts bearing an "I Love Manila" embroidery to pastels and solid-colored shirts with pop art designs of jeepneys , coconut trees, and the sun with eight primary rays insignia present in the national flag, making every visual a perfect image of the country's island culture.
In the middle of the triangle is a sun, representing the light of freedom, and is composed of eight primary rays, each representing a Philippine province involved in the 1896 Philippine revolution against Spain.
In FC07 L26 we observed two macrodiscohexasters with very short primary rays, and they are 0.118-0.126 mm in diameter with primary rosettes 0.019-0.022 mm in diameter.
To a packed house, including newsmen, Compton recounted the long history of the investigation of cosmic rays and presented the overwhelming evidence that the primary rays were electrically charged corpuscles--predominantly protons and alpha particles, together with some positive and negative electrons.
Some observers had found that this scattered or "secondary" radiation did strange things--it seemed to have a directionality to it and, most extraordinarily, to have a different, longer wavelength than the primary rays. What could be going on?
The Philippine flag has two horizontal bands of blue and red with a white equilateral triangle based at the hoist side and a golden yellow sun in the centre of the triangle with eight primary rays - each containing three individual rays.
Inflorescence terminal, umbellate, 5-19 cm long, 3-7 cm wide, with 6-10 primary involucral bracts, the lowermost 1-2 leaf-like and exceeding the inflorescence, the uppermost setaceous, lowest involucral bract 10-30 cm long, 1.5-2.6 times as long as the inflorescence; primary rays 5-15 ascending to curving with age, at least the thinnest more or less flexuous, flattened or compressed-trigonous, antrorsely scabrous on margins distally, smooth proximally, the longest 5-11 cm, second, third, and occasionally fourth order branching present, with the spikelets ultimately sessile or rarely short-peduncled (< 5 mm) in fascicles of 2-7 or rarely solitary at tips of primary or second order branches.
Unfortunately, if the grid is partially in place, the unit will allow an exposure but the resultant image will demonstrate a gradual loss of density across the film due to the absorption of primary rays by the grid.
2I) with smooth primary rays and micro-rough secondary rays numbering 1-4, often with branching retricted to one axis; discohexaster (or tylohexasters) with short smooth primary rays, each bearing 5 rough secondary rays terminating in a small cap with 4-6 marginal spines (Fig.