Detecting cosmic radiation levels in the middle upper atmosphere
Download
1 / 30

Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere - PowerPoint PPT Presentation


  • 73 Views
  • Uploaded on

Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere. St Paul’s School Asgard - II Module. Asgard I. We placed several dosimeters on board the BalloonSat . One dosimeter containing film was placed next to the electronics inside the BalloonSat.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere ' - zahi


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Detecting cosmic radiation levels in the middle upper atmosphere

Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere

St Paul’s School Asgard- II Module


Asgard i
Asgard I Atmosphere

We 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.



Cosmic rays
Cosmic Rays Atmosphere

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
Ionisation Chamber Atmosphere

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 tube
Geiger-Muller Tube Atmosphere

The 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
The High Voltage Supply Atmosphere

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 detector
GM Tube output pulse detector Atmosphere

There 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
555 Monostable operation Atmosphere

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.

Once the time period has started further trigger pulses are ignored.


The arduino
The Arduino Atmosphere

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
Other measurements ( Atmosphere Asgard I data)


Eeprom
EEPROM Atmosphere

“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 atmosphere1

Detecting Cosmic Radiation Levels in the Middle & Upper Atmosphere

St Paul’s School Asgard- II Module




https:// Atmosphere www.facebook.com/groups/153214554744003/


ad