Lab 11 - Radioactivity

Lab 11 - Radioactivity - i,L j I r i-t.i i il fruv'1 i i I...

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Unformatted text preview: i,L j I r! i)'-t..i i.,' il-\\, fruv'1\ i i : I F._-- I I l t;l f | ! I \ | -t I t' ,7- .\ rt tl \j'u, , i , ,, g,}{) ' Physics Lab: Radioactive Half-Life Review the attached iirerature regarding the radiation counter and the isotope generator. Connect the GM tube to the radiation counter; plug the counter in and turn it on. Place the GM tube into the top hole of the sample holder. You will have to remove the red protective cap. Do not touch the tube's window. Doing so will provide a very expensive learning experience. Familianze yourself with *re controls and displays. Raise the voltage to 800V. Make five separate one minute counts of f*uground radiation' Organize your work area; prepare your lab book to record data and set up a timer before getting your radioactive sample. The liquid sample goes into a shallow metal cup which must be centered on the small, removable plastic shelf in the holder. The shelf should be placed in the highest slot. Follow the isotope generator's insffuctions in extracting your sample. Do this under your instructor's supervision. Quickly position your sample and begin making 30 second counts. If your first thirty second count is less than 2,000 inform your instructor. You count for the first thirty seconds of each minute; you use the second thirty seconds of each minutelo 1e.cog{ the data and reset the counter. Repeat thirty times. Do not touch th{t#:'f,eaving the depleted sample in placi, make a ten minute count for background radiation 1 each of your thirfy second counts by subtracting the average backgrciund count (ten minute background count/20). I -: JP Graph your data. Determine the halflife from your graph. Consider a f''o f, -l . h n.l- \Jt4Prr yuur Lrata. Lrsrtrllrrllln rrls rrall-Illg uullt yuur E{4Prr. uLrllDl\.rsr dr L' u " - \"0\ ., *" semilogarithmic graph. \-'_*----r rut\- \ L t/. / i . -"(" \ 11 "" The generator suffers short-term partial depletion of the isotope we are exffacting. ,",", \-' \rr- 'i" #ho balance this, the first sample should be five drops, the seconA ri" aropt; ;;J;" ,#' \ ''i- " ' , rJ\* ..,_' 1'* on. If more than one generator is available, alternate. *'::-q.' \ \ \ .- Draft,Dec.'03 MAS \ .,, "'-* \'r -' \., *. \ ..,i.. .', )" . ., \\. _d,-.(-'-4.--' l1r\ -,: ' i ,\ . \ .4r-'._ ,,'\".. ,. lll,,t( t" j, V Hh*-t $-hx-l w o\ ds Spectrum Techniques-- ------ .-t--r-t--- u ! - t-- -- - v------ Model ST350 Radiation Counter oPeration' .AUTI'N : Never operete the ST350 Radiation Counter wlth the GM probe disconnected. Dangerous voltages can exist at the probe connector so ensure the Instrument is in the OFF position and the high voltage is set to zero beforc disconnecting or reconnecting the GM Probe....
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This note was uploaded on 10/05/2011 for the course PHYS 4c taught by Professor Parsons,b during the Fall '08 term at Saddleback.

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Lab 11 - Radioactivity - i,L j I r i-t.i i il fruv'1 i i I...

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