Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere St Paul’s School Asgard- II...
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Transcript of Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere St Paul’s School Asgard- II...
Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere
St Paul’s School Asgard- II Module
Asgard IWe placed several dosimeters
on board the BalloonSat.
One dosimeter containing film was placed next to the electronics
inside the BalloonSat.
We also placed two thermoluminescence dosimeters (TLD, for measuring radiation at
the finger tips) on the outside of the BalloonSat with a third was kept as a control.
Asgard I radiation results
Cosmic Rays
The illustration at right shows that the detected cosmic ray flux peaks at about 15 km in altitude and then drops sharply (note the logarithmic
scale on the altitude).
This kind of variation was discovered by Pfotzer in 1936. It suggests that
the detection method used was mainly detecting secondary particles
rather than the primary particles reaching the Earth from space.
Ionisation Chamber
The ionization chamber is the simplest of all gas-filled radiation
detectors, and is used for the detection or measurement of
ionizing radiation
Geiger-Muller TubeThe GM tube we used was ZP1481
produced by Centronic Ltd. It contains a inert gas atmosphere
The tube had a recommended working voltage at 430V with a
mica window thickness of 2.5mg/cm3
The window diameter is 17cm and has a maximum background count of 30 counts/min when shielded
with 50mm of Lead.
The optimum operating range is between -40 and +70C and we
know that low humidity will not have an effect.
The GM tube has a halogen quenched tube making it very
sensitive to Beta and Alpha Radiation.
The High Voltage Supply
It is based on a disposable camera’s high voltage flash unit.
We modified the circuit by replacing the 80µF bulk storage capacitor with a 2.2nF on. Also we power the circuit
with a 3.0VDC.
GM Tube output pulse detectorThere is a small issue relating to the fact that pulses coming from the GM tube are not sufficient enough to be
registered by the Arduino.
The series of Transistors shown below act to first amplify then invert the output into the 555 monostable shown. This
monostable outputs pulses to the Arduino which counts them.
555 Monostable operation
Once the time period has started further trigger pulses are
ignored.
The timing period is triggered (started) when the trigger input (555 pin 2) is less than 1/3 Vs, this makes the output high (+Vs) and the
capacitor C1 starts to charge through resistor R1.
The Arduino
The Arduino microcontroller is an open source family and uses a
simplifies version of C++
Plug and Play system using an IC2 Bus thereby making it very easy
to use.
Other measurements (Asgard I data)
EEPROM
“Electrically Erasable Programmable Read-Only Memory”
a type of non-volatile computer memory to store data that must be saved when
power is removed
Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere
St Paul’s School Asgard- II Module
Asgard II radiation results
Asgard II acceleration results
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