Anomalous light flashes: from astronauts to protontherapy
Transcript of Anomalous light flashes: from astronauts to protontherapy
Anomalous light flashes: from astronauts to protontherapy
E.KhanF.Maréchal
R.DendaleC.Mabit
V.CalugaruL.Desjardin
L.Narici
ALTEA(INFN/ESA/NASA)
IPNOrsayProtontherapyCentre,Orsay
E.Khan
Cosmicrays(p,Nuclei,…)
Interac(oninatmosphere
Interac(oninspace
Nucleosynthesis(spallaLon)
Satellites
Astronauts
Auroraborealis
Lightningbolt? Clouds?
LifeonEarth?
E.Khan,IPNO
Spectrum
Solar
GalacLc
UHECR
PredictedbyTobiasin1952C.A.Tobiasetal.,Nature230,596(1971)M.Casolinoetal.,Nature422,680(2003)
Anomalouslightflashes:Phosphenes
ExperiencedbyN.ArmstrongandE.Aldrinin1969L.S.Pinskyetal.,Science183,957(1974)
P.J.McNulty,Single‐eventseffectsexperiencedbyastronautsandmicroelectroniccircuitsflowninspaceIEEETransacLonsonNucl.Sci.43,475(1996)
PrincetonParLcleAccelerator(1970)
6DSSSD380µm
Cosmicrays
ISS
CosmicraysidenLficaLon
L.Narici,ALTEA
p
Whatdotheysee?
W.G.Sannitaetal.,VisionResearch46,2159(2009)
ApolloSkylab
MIR
Eyeorbrain?
• p:largerflux,lowerLETLET:60MeVp:2keV/µm250MeV12C:12keV/µm
• PhosphenesprotontherapycentresstatusLNS(Catania):NophosphenesLomaLinda(CA):No‐>Maybe?ICPO(Orsay):Seenextslides…
Protonsornuclei?
StudyatOrsayprotontherapycentre
• 4x1min55MeVprotonsineyetumour,1010pps
• QuesLonnaireattheendofeachsession
• Firststudy:70paLents
Results
E.Khanetal.,Adv.SpaceResearch45,846(2010)
• 43%seeatleastoneflashduringthetreatment• Colors:blue(61%),white,yellow,purple• Shapes:clouds(39%),dot‐like,linear
• IrradiaLononthereLnaisnotsufficienttotriggerflash• ContaminaLonbyX‐raysandCerenkovphotons:bluecloud,alsodiscardedbysimulaLon
Conclusions
• Database500paLents
• BeamTracking
• ComparisonwithotherfaciliLes
• ContaminaLonbysecondaryXraysorCerenkovphotons
• Roleoftheflux,theLETandphysiology?