NRSB / FL RADON UPDATE|EXAM QUESTIONS WITH MULTIPLE CHOICES |VERIFIED & REVISED ANSWERS (NEW)!!!

NRSB / FL RADON UPDATE|EXAM
QUESTIONS WITH MULTIPLE
CHOICES |VERIFIED & REVISED
ANSWERS (NEW)!!!
Whichmofmthemfollowingmstatementsmismmostmcorrectmaboutmradonm(Rnm222)?



a.mInm3.8mdaysmitmdecaysmcompletelymintomradonmdecaymproducts

b.mItmismamchemicallymreactivemgasmproducedmbymradium

c.mItsmhealthmriskmismlessmthanmthatmofmitsmdecaymproducts

d.mAboutm16%mofmUSmhousesmhavemradonmlevelsmabovem4mpCi/Lm-
mCORRECTmANSWERmC)mItsmhealthmriskmismlessmthanmthatmofmitsmdecaymproducts




AmismincorrectmbecausemonlymHALFmthemradonmdecaysmintomRDPsminm3.8mdays.mBmismincorrectmbeca
usemradonmisminert;mthemRDPsmaremchemicallymreactive.mDmismincorrectmbecausemEPAmestimatesm1mi
nm15mU.S.mhomesmhasmanmelevatedmradonmconcentration,mwhichmequatesmtomaroundm6%.



Whichmofmthemfollowingmtypesmofmradiationmfrommradonmdecaymproductsmdeliversmthemmostmamo
untmofmenergympermsinglemimpactmtomlivingmtissue?



a.mBetamradiation

b.mGammamradiation

c.mAlphamradiation

d.mLeadm210m-mCORRECTmANSWERmC)mAlphamradiation



Alphamparticlesmaremthem"Macmtruck"mofmradiationmwithmamRelativemBiologicalmEffectmthatmism20mti
mesmgreatermthanmthemRBEmformbetamormformgammamradiation.

,Whichmofmthemfollowingmstatementsmaboutmradonmprogenymismtrue?



a.mTheymaremcharged,mradioactivemparticles.

b.mTheymareminertmparticles,mreleasedmfrommthemradonmnucleus.

c.mTheymaremnotmasmharmfulmtomhumansmasmradonmgas.

d.mTheymallmdecayminmlessmthanm3mminutes.m-
mCORRECTmANSWERmA)mTheymaremcharged,mradioactivemparticles.




BmismincorrectmbecausemRDPsmaremchemicallymreactive.m(Remember,mit'smthemgasmthat'sminert).mCmi
smincorrectmbecausemthemRDPsmaremmoremharmfulmthanmthemgasmbecausemRDPsmaremchargedmradi
oactivemparticlesmthatmcanmattachmtomthemlungmandmdepositmthemalphamdirectlymtomthemtissue.mDmis
mincorrectmbecausemonlymhalfmthemPo-218mdecayminm3mminutes,mhalfmthemPb-


214mdecayminm27mminutes,mhalfmthemBi-214mdecayminm20mminutesmandmhalfmthemPo-
214mdecayminmlessmthanmamsecond.



AccordingmtomthembestmEPAmestimates,mhowmmanymlungmcancermdeathsmoccurmeachmyearminmthemU
nitedmStatesmfrommradonmexposureminmhomes?



a.m2,200

b.m12,000

c.m21,000

d.m50,000m-mCORRECTmANSWERmC)m21,000



ThemlatestmriskmanalysismbymEPAminm2003mactuallymdeterminedmthembestmestimatemism21,000mdeath
smpermyear.



Amradioactivemelementmwithmamhalf-
lifemofm30mdaysmwasmcollectedminmamsealedmcontainer.mIfmonmJanuarym1mitmwasmdeterminedmthatmth

,emcontainermhadm100mpCi/Lmofmactivity,mhowmmuchmactivitymwouldmbeminmthemcontainermonmJunem
1mofmthemsamemyear?



a.m100mpCi/L

b.m1.6mpCi/L

c.m50mpCi/L

d.m3.1mpCi/Lm-mCORRECTmANSWERmD)m3.1mpCi/L



Jan.m1m=m100mpCi/LmFeb.m1m=m50mpCi/LmMar.m1m=m25mpCi/L

Apr.m1m=m12.5mpCi/LmMaym1m=m6.3mpCi/LmJunem1m=m3.1mpCi/L



Ifmradonmweremmeasuredmatm4mpCi/Lmandmradonmdecaymproductsmmeasuredmatm0.01mWL,mwhatmw
ouldmbemthemequilibriummratio?mER=mWLmxm100m(dividedmby)mpCi/L



a.m0.04

b.m0.25

c.m0.50

d.m0.05m-mCORRECTmANSWERmB)m0.25



ERm=m0.01mWLmxm100m(dividedmby)m4.0mpCi/L



Themequilibriummratiominmthempreviousmquestionmwouldmmostmlikelymreflectmwhatmtypemofmconditi
on?



a.mAmmeasurementmerrormperhapsmduemtomthoron,mamradonmisotope

b.mLackmofmoutdoormairmexchange

c.mLimitedmindoormairmcirculation

, d.mFilteringmofmindoormairm-mCORRECTmANSWERmD)mFilteringmofmindoormair



AnmERmofmonlym25%mmeansmthatm75%mofmthemRDPsmaremplated-
out.mTwomthingsmcanmgenerallymcausemamlotmofmplate-
out:mhighmairmcirculationmblowingmthemRDPsmsomtheymattachmtomnon-
airbornemobjectsmormamsophisticatedmairmfiltermthatmwouldmpullmthemmfrommthemairmandmcausemthe
mmtomplate-outmonmthemfilter.



Whichmofmthemfollowingmismnotmnecessarilymamcorrectmstatement?



a.m1mpCi/Lmrepresentsm2.22mdisintegrationsmpermminute

b.mAmmeasurementmofm0.02mWLmofmradonmdecaymproductsmmeansmthatm4mpCi/Lmradonmexistsminmt
hemroom.

c.m1mWLmofmradonmdecaymproductsmismdefinedmasmthatmwhichmismproducedmfromm100mpCi/Lmofmrad
onmatmequilibrium

d.m1mpicoCuriemismonemtrillionthmofmamcuriem-
mCORRECTmANSWERmb.mAmmeasurementmofm0.02mWLmofmradonmdecaymproductsmmeansmthatm4mpC


i/Lmradonmexistsminmthemroom.



BmismnotmnecessarilymamcorrectmstatementmbecausemitmismonlymtruemwhenmthemERmism50%.mWhilemt
hatmismwhat'smassumedmwhenmwemdon'tmknowmotherwise,mwemknowmonmaveragemthemERmrangesm
betweenm30%-
70%..mThemkeymtomCmaremthemwordsm"atmequilibrium.'mWhilemthismmaymbemimpossibleminmamroomme
nvironment,mifmthem100mpCi/LmwerematmequilibriummwithmthemRDPs,mitmwouldmbemtrue.



Anmequilibriummratiomofm50%mismtypicallymassumedmwhenmconvertingmfrommWorkingmLevelmmeasu
rementsmtomradonmconcentrations.mWhatmdoesmthismmean?



A)mOfmthemRDPsmproducedmfrommthemradonminmthemroom,m25%maremattachedmtomthemwallsmandman
otherm25%maremattachedmtomsuspendedmparticulatesminmthemroom