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TL-1

TL-1

£210.00

The Self-Illuminated TL-1 utilises green light to a brightness of 1,000μL providing practical illumination of an area of 10cm2. Brightness is not affected by temperature, humidity, altitude or operational plane.
The Tl-1 is self-illuminating, requiring no batteries, bulbs or secondary light source. They are suitable for use in hazardous atmospheres and will continue to operate normally in adverse environmental conditions, even when immersed in water.
Markers are rated for operation in temperatures between -60°C and +70°C.
Torches are self-illuminating, requiring no batteries, bulbs or secondary light source. They are suitable for use in hazardous atmospheres and will continue to operate normally in adverse environmental conditions, even when immersed in water.
Markers are rated for operation in temperatures between -60°C and +70°C.
NATO stock number 6260-99-965-3582.

TheTL-1-1 uses the same battery as the original Schofield torch.
The Nickel plating is the same used on the UV-1, P-2 and Small Wall Clock. If you wanted a matching set.

In stock

Category:
000

DOSE FROM BREAKAGE OF A TL-1 Tritium Module

A TL-1 is a tritium activated light source that contains approximately 2 Curies.
Typically this module would contain much less than 1% of tritium in the oxide form, to be conservative however, this assessment will assume that as much as 2% of the contents would be converted to tritium oxide (HTO) and released.
The scenario will be assumed to take place in a room that is 10 metres long by 5 metres wide and 3 metres high yielding a total volume of 150 m3.
The scenario will make the most conservative assumption that the tritium concentration in the room would stay constant for the entire stay time and be equal to the initial concentration assuming no ventilation exists.
Breakages would be observed by occupants and exposure time would therefore be much less than 5 minutes.
The tritium concentration “x” in the room was used to calculate the dose to an individual “D” using the following equation and standard parameters:

D = [(x) (B) (DCF) (t) (%HTO)] FOR HTO + [(x) (B) (DCF) (t) (%HT)] FOR HT

x = tritium concentration (Bq/meters3)
= 2Ci/150m3 = 0.0133 Ci/ m3 = 4.93 x 108 Bq/ m3

B = breathing rate of an individual (meters3/second)
= 2.66 x 10-4 m3/s (for an adult) (23.01 m3/day)

DCFFOR HTO = dose conversion factor for an individual for HTO (millisieverts/Bq)
= 4.0 x 10-8 mSv/Bq (inhalation and skin absorption for an adult)

DCFFOR HT = dose conversion factor for an individual for HT (millisieverts/Bq)
= 2.40 x 10-12 mSv/Bq for HT (inhalation for an adult)

t = exposure time (minutes) = 300 seconds

%HTO = % of concentration which is tritium oxide = 0.02

%HT = % of concentration which is tritium gas = 0.98

The maximum dose to an individual from this hypothetical accident scenario was calculated to be 0.032 mSv. This is lower than the radiation dose to a passenger taking a flight from Montreal to London, which would result in a dose due to cosmic radiation of 0.0478 mSv.