Apparatus for collimation of radiation signals for long distance transmission and method of construction therefor

Claim 1

A source assembly for a radiation detector comprising: (a) a collimator shielding body; (b) an elongated collimator assembly comprising a series of radiation opaque elongate members defining a plurality of parallel elongated gamma transmitting passages; (c) said collimator assembly being axially received in said body; (d) a gamma outlet window secured to said collimator shielding body and overlying an outlet end of said collimator assembly; (e) gamma inlet window secured to said collimator body in spaced relationship with the outlet window and overlying an inlet end of said collimator assembly; (f) a tubular source shield secured to the collimator body and defining a source chamber adjacent the inlet window; (g) a radiation source in the chamber and having a radiation face near said inlet window and aligned with said collimator assembly to emit gamma radiation through said elongated passages; and, (h) a shielding cap removably secured to the shield body to permit facile replacement of the source while preventing emission of radiation rearwardly of the shielding body when the assembly is in use.