A CaF2 Mn TLD chip is enclosed in a capsule made of CaF2 Mn

A CaF_2: Mn TLD chip is enclosed in a capsule made of CaF_2: Mn, 0.5 g/cm^2 thick, and is given a free-space 60^Co 7-ray exposure of 2.58 times 10^-2 C/kg. The chip thickness is 0.90 mm in the radiation direction. You may assume that 0 = 1.003. Calculate the average absorbed dose in the TLD chip. Redo problem 4 with the CaF_2: Mn capsule replaced by an aluminum capsule having the same mass wall thickness. to calculate the dose in A1 under TCPE conditions, then Burlin cavity theory to relate the average dose in the CaF_2: Mn chip to the TCPE A1 dose.) If the TLD chip in problem 4 gave a TL reading of 3.49 X 10-8 C after the exposure described, what was the value of the dose calibration factor The same TLD chip as in problems 4 and 6 is exposed to a beam of 100-keV electrons, resulting in a TL reading of 2.36 times 10^-7 C. What is the average absorbed dose in the whole chip? Assuming that the electrons strike the chip perpendicular to its 3.2 times 3.2-mm flat surface, what is the average dose within only the surface layer of thickness equal to the CSDA range of the electrons? Is this dose still in the linear-response range for CaF2: Mn? What was the fluence of electrons that struck the chip, assuming back- scattering to be negligible?

Solution

answers are

(a) 5.69Gy.

(b) 87.9Gy

(c) yep

(d)1.016*10¹⁵ e/m²