explosive investigation

Question 1

purpose of explosive investigation

Answer 1

1. initial investigation = piece together context
2. evidence and trial = what can be proved

Question 2

types of evidence

Answer 2

1. classification - are the explosives linked? can they be traced?
2. identification - type of explosive? prim. sec?
3. quantification - how much?

Question 3

the 3 Ss

Answer 3

selectivity - determining the analyte from the mixture
specificity - only the desired analyte contributes to the result
sensitivity - LoD and LoQ in a linear slope response

Question 4

collecting residues

Answer 4

look for point on detonation (crater)
appropriate cordons to accommodate scatter
embedded in nearby objects

Question 5

analytical equipment

Answer 5

spectroscopy - Ir/Raman, X -ray, SEM-EDX
separation - HPLC/GC, Ion chromatography, electrophoresis
detectors - Mass spec, FID

Question 6

clean room techniques

Answer 6

• positive pressure
• high efficiency particulate air filters
• disposable equipment
• regular monitoring

Question 7

contaminant levels and their actions

Answer 7

less than 5ng = no action
5-10ng = confirm Id and clean
10-100 ng = clean area and test until negative
more than 100ng = ID source, review affected case work