Radiation detection devices

Claim 1

IN A UNIT WHICH CONTAINS PHOTOSENSITIVE MATERIAL FOR DETECTING AND INDICATING THE PRESENCE OF NUCLEAR RADIATION, IN COMBINATION, AN ENVELOPE HAVING A PAIR OF WALL MEMBERS WHICH ARE EACH SUBSTANTIALLY IMPERVIOUS TO PROCESSING LIQUID EMPLOYED WITH THE UNIT AND WHICH ARE ARRANGED IN SUPERPOSED RELATION WITH RESPECT TO EACH OTHER, SAID WALL MEMBERS ALSO BEING FURTHER CHARACTERIZED BY THE FACT THAT THEY ARE EACH SUBSTANTIALLY OPAQUE TO RADIATION OF A WAVELENGTH WITHIN THE VISIBLE SPECTRUM AND THAT THEY TRANSMIT SHORTER WAVELENGTH RADIATION INCLUDING X-RAYS AND GAMMA RAYS, A PHOTOSENSITIVE ELEMENT AND A PRINTCARRYING ELEMENT POSITIONED WITHIN SAID ENVELOPE IN SUPERPOSED RELATION TO EACH OTHER, A RUPTURABLE CONTAINER HOLDING A LIQUID PROCESSING COMPOSITION CARRIED WITHIN SAID ENVELOPE AND IN A POSITION SO AS TO BE CAPABLE OF BEING RUPTURED AND, UPON RUPTURE, OF RELEASING ITS LIQUID CONTENT BETWEEN SAID SUPERPOSED PHOTOSENSITIVE AND PRINTCARRYING ELEMENTS. SAID PHOTOSENSITIVE ELEMENT HAVING AT LAST ONE RECORDING STRIP OF PHOTOSENSITIVE MATERIAL COMPRISING A HEAVY METAL SALT WHICH, UPON PHOTOEXPOSURE TO NUCLEAR RADIATION TO BE DETECTED, AS WELL AS TO VISIBLE RADIATION, IS CAPABLE OF HAVING FORMED THEREIN LATENT IMAGE WHICH IS DEVELOPABLE TO THE METAL OF SAID SALT, SAID PRINT-CARRYING ELEMENT COMPRISING A SHEET MATERIAL FOR SUPPORTING PRINT-FORMING COMPONENTS TRANSFERRED FROM SAID PHOTOSENSITIVE ELEMENT UPON DEVELOPMENT AND PROCESSING OF LATENT IMAGE, SAID RUPTURABLE CONTAINER HOLDING AS A PROCESSING LIQUID AT LEAST THICKENING AGENT AND A