An answer depends on a source of thorium X-ray. This X-ray is absent in case of Th-234 decays to Pa-234. See for example "Radionuclide Transformations. Energy and Intensity of emissions". Radiation Protection. ICRP PUBLICATION 38. Published by Pergamon Press, 1984 

X-rays are a type of energy similar to light and like

gamma rays; pass easily through fairly thick materials it is 4 MV

to 25 MV energy range

but

Gamma Radiation is similar to light and x-rays. It may penetrate through

many inches of iron, concrete, wood, plastic, water, etc. Patients who have

received large doses of radioactive materials that emit gamma rays (for

example, in undergoing some therapy procedures such as Iodine-131 MIBG

used to treat neuroendocrine tumours) may be a source of exposure to nurses

and other personnel.

Not all radiation interacts with matter in the same way. Radiation that has

enough energy to move atoms in a molecule around or cause them to vibrate,

but not enough to remove electrons, is referred to as "non-ionizing

radiation." Examples of this kind of radiation are sound waves, visible light,

and microwaves.

Radiation that falls within the ionizing radiation" range has enough energy to

remove tightly bound electrons from atoms, thus creating ions. This is the

type of radiation that people usually think of as 'radiation.' We take

advantage of its properties in diagnostic imaging, to kill cancer cells, and in

many manufacturing processes.

I agree with Dr Kuzminov.

It is of significance that you mesure the efficiency of your HPGe D correctly and specifically at the energy range wanted. Try also MC as well if you do not have the experiemntal conditions and accuracy needed.