====== Radiation II: Measuring Half-Life ======
----

**Set up in KPTC 005 or 009 (basement labs) so that you are near the howitzer.** There should be 7 individual setups and 1 TA setup.

==== Common area ====

  * General measuring equipment
    * Rulers
    * Calipers

  * Radiation sources
    * Gamma emitters: Cs-137 buttons (7)
    * Silver foils
      * One full container for the "fresh" (not-yet activated) foils
      * One empty container for the "used" (activated, but not yet fully-decayed) foils
    * Indium foils
      * One full container for the "fresh" (not-yet activated) foils
      * One empty container for the "used" (activated, but not yet fully-decayed) foils
    * Lead shielding (3 blocks)

  * Demo items
    * Survey meter
    * GM tube with a broken window (so you can see inside)

  * Extra equipment
    * GM tube in holder (1 or 2 extras)
    * ST370 Radiation Counter (1 or 2 extras)
    * BNC cable (1 or 2 extras)
    * USB cable (1 or 2 extras)

| {{:phylabs:lab_courses:phsc-116_117-wiki-home:radioactivity-ii-measuring-half-life:common_3.png?direct&400|}} | {{:phylabs:lab_courses:phsc-116_117-wiki-home:radioactivity-ii-measuring-half-life:common_2.png?direct&400|}} |

==== Individual station ====

  * Detection equipment
    * GM tube in holder (w/ source holder //only//)
    * ST370 Radiation Counter
    * BNC cable
    * USB cable

Connect equipment at each station and test with the STX software (with high voltage set to +900 V) using a button source.

| {{:phylabs:lab_courses:phsc-116_117-wiki-home:radioactivity-i-detecting-radiation:individual.png?direct&400|}} |

Set up 7 individual stations and 1 identical "TA station" (which should be marked with a sign so that students don't use that station).

On the TA station, download the following indium half-life backup data:
  * {{ :phylabs:lab_courses:phsc-116_117-wiki-home:radioactivity-ii-measuring-half-life:indium_backup.zip |}}

==== Howitzer ====

In preparation for each session, do the following:
  * make sure that at least two ports on the howitzer are available for use (typically P1, P2 and P3 are free and P4 is used by PHYS 211);
  * place at least a couple indium foils in one port of the howitzer at least 3 hours prior to the lab session (so that the TA has an activated foil ready to deploy for the indium half-life measurement).

| {{:phylabs:lab_courses:phsc-116_117-wiki-home:radioactivity-ii-measuring-half-life:howitzer.jpg?direct&400|}} |