Presentation on theme: "Thermo RadEye GX, SX, and PX with Various Detectors"— Presentation transcript:
1Thermo RadEye GX, SX, and PX with Various Detectors LA-URThermo RadEye GX, SX, and PX with Various DetectorsJames T. (Tom) VossLos Alamos National LaboratoryHealth Physics Measurements Group (RP-2)Radiation Instrumentation and Calibration Team
2The following detectors have been set up on the appropriate model of RadEye. The RadEye GX (GM-eXternal detector), SX (Scintillator-eXternal detector), and PX (Proportional-eXternal detector).RadEye GX with HP-260/-360/-210T, Ludlum 44-9 GM Pancakes and HP-270/-290/-310/-300 Energy Compensated Gamma DetectorsRadEye SX with HP-380AB, L43-93 Alpha/Beta surface contamination, L beta scintillator, and NaI detectors.RadEye PX with Ludlum Air Proportional Alpha detector and Neutron Rem Ball.
3The RadEyes with the various detectors perform much better than the E In the case of the RadEye with the newer Ludlum air proportional alpha detector, the RadEye is remarkably better than any other electronics with an air proportional alpha detector.RadEyes could replace Ludlum Model 2s, 3s, and 139s, Eberline ESP-1s and 2s, E-600s when they are no longer repairable.
5RadEyes –the Good, the Bad, and the Opportunities for ImprovementGood1. Almost indestructible, I keep on doing my toss in the air and let fall on concrete and haven’t broken a RadEye yet2. Versatile – the 3 different versions of the RadEye will work well with all of our detectors3. Easily repaired – we wouldn’t; if its broken then its trash4. Calibration is much like the E-600/detector calibration5. Audible indication of count rate and audible indication of alarm
66. Scaler mode in either time to count or accumulated counts 7. Background subtraction8. Data-logging capable9. Some detectors show a great improvement in efficiency when used with the RadEye10. Lower crosstalk for alpha/beta detectors with the two windows separated for threshold11. The HV plateau shows the slopes for up to 3 threshold settings and shows the count rate for each of the threshold settings at each step on the HV plateau12. Only 5 buttons to control all of the available RadEye functions13. Cost is lower than other comparable instruments
7Bad1. Long turn around time on questions for the RadEye (LANL to Mark Deacon, Mark Deacon to Germany, Germany back to Mark Deacon, Mark Deacon back to LANL)2. The HV plateau printout is the only calibration record and it says “Erlangen – Germany plus the date” right above the signature line for the calibrator (tester)3. The calibration technician has to calculate the detector efficiency and enter that value into the Nuclide menu in the setup software4. We need all 3 RadEye models (GX, PX, and SX) to do what we are currently doing with the E-600
8Opportunities for Improvement 1. We need better communications with the right RadEye experts2. The HV plateau printout could be improved for our records3. We need to figure out our work arounds for the things the RadEye will not do
9Radionuclides used in the setup of the RadEyes AlphaPu MeVTh MeVBetaSr/Y /2,284 KeVCl KeVTc KeV
10RadEye GX/HP260/HP360 15 cm2 GM Pancake detector (Display is in Cl-36 DPM)Sr/Y % Eff.Cl % Eff.Tc % Eff.Alpha detectionPu % Eff.Th % Eff.Alarm level 1 is 100 DPMAlarm level 2 is 500 DPMSigma alarm 3
11RadEye GX/HP270 Energy compensated GM detector Alarm level 1 is 50 uR/hrAlarm level 2 is 5 mR/hrSigma alarm 3RadEye GX/HP300 Energy compensated GM detector for near Background Level measurements
12RadEye SX/L43-93 100 cm2 Dual Scintillator alpha beta detector (Display is for Pu-239 DPM)Pu % Eff.Th % Eff.Alpha Alarm level 1 is 100 DPMAlarm level 2 is 500 DPMSigma alarm 3
13RadEye SX/L43-93 100 cm2 Dual Scintillator alpha beta detector (Display is for Cl-36 DPM)Sr/Y % Eff.Cl % Eff.Tc % Eff.Beta Alarm level 1 is 1000 DPMAlarm level 2 is 5000 DPMSigma alarm 3Alpha to Beta Crosstalk to 5.1% for Pu-239, 8.1 to 22.3% for Th-230Beta to Alpha Crosstalk 0 to 0.36% for Sr/Y-90, 0% for lower energy betas
14RadEye PX/L cm2 air proportional alpha detector(Display is in Pu-239 DPM)Pu % Eff.Th % Eff.Alarm level 1 is 100 DPMAlarm level 2 is 500 DPMSigma alarm 3
15RadEye PX/L43-32 72 cm2 air proportional alpha detector (Display is in Pu-239 DPM)Pu % Eff.Th % Eff.Alarm level 1 is 100 DPMAlarm level 2 is 500 DPMSigma alarm 3
16RadEye PX/NRD He-3 neutron detector (160 cpm per mRem/hr)Alarm level 1 is 0.1 mRem/hrAlarm level 2 is 5 mRem/hrSigma alarm 3