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hor the last two years, wc have been involved in thedesign of DCARR. a Differential Critical Ancle Reflection Refraction detector system, that measure) 500-to 5000-eV low-energy x rays v. ith a high degree ol resolution (250 eV). This capability was not previously available in field testing. I'lie first eight detectors have been assembled, calibrated, and installed fortesting in a nuclear field event in early September. GAS SAMPLING A POST-SHOT CAVITY (J. Meier. Nuclear Test Engineering Division) • > We have designed and assembled a gas sampling system thai allows immediate recovery ol radioactive gases Irom the cavity produced by a nuclear test. Many successful tests have been carried nut with tiiis system.