====== Radiation III: Radiodating ======
----

**Set up in KPTC 005 or 009 (basement labs) so that you are near the howitzer.** There should be 7 individual setups. (The TA setup is no longer needed for this lab.)

==== Common area ====

  * General measuring equipment
    * Rulers
    * Calipers

  * Radiation sources
    * Gamma emitters: Cs-137 buttons (7)
    * 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)

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==== 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.

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==== Howitzer ====

In preparation for each session, do the following:
  * make sure that at least three ports on the howitzer are available for use (typically P1, P2 and P3 are free and P4 is used by PHYS 211);
  * place a class set of indium foils (at least 24 foils, or about 3 per group with a few spares) in one port of the howitzer overnight;
  * remove 8 foils (1 per group plus a spare) at some time prior to the start of lab (typically 2-3 hours before the start) and record the "time of death"; and
  * place these foils in the lab (in a location available to the TA) and email the TA the "time of death".

| {{:phylabs:lab_courses:phsc-116_117-wiki-home:radioactivity-iii-radiodating:howitzer.jpg?direct&400|}} |

This process allows students to have //one dead foil// and then take //up to two new foils// from the howitzer during the lab period if needed as part of their radiodating measurements.